How To Make Interior Storm Window

How To: Build Interior Storm Windows

Have you ever wondered whether there was a do-it-yourself solution to the problem of drafty windows in the winter? Fortunately, it is precisely what a storm window is intended to do. I made a video a couple of years ago on how to buildDIY Storm Windowsfor the exterior of your old windows, and I thought it was about time I showed you how to make an even easier version for the interior of your home. As with outdoor storm windows, commercially accessible inside storm windows are manufactured by firms such as IndoworInnerglass and are similar in appearance.

Making your own internal storm windows is a straightforward process that requires just rudimentary carpentry abilities.

Here, I’ll guide you through the process of measuring and assembling your own inside storm window so that you can stop shivering this winter.

Let’s get this party started!

Measuring For Interior Storm Windows

Six locations were measured. Interior storm windows must be put in your window wells, preferably at the bottom of the window well. You’ll need 3/4 inch of clear flat area around your window to make it functional. On contemporary homes, the ideal position to put it is most likely within a recess in the wall, while on older homes, the optimum spot is frequently on top of the interior stops. Remove or rearrange any blinds or shades that are currently in the window well onto the casing or somewhere else out of the way before continuing with the project.

  1. Measure the aperture in six different locations, much like the illustration shown, to account for windows that are not square or bent.
  2. The tighter the fit, the greater the energy savings you’ll get, therefore it’s best to measure twice and cut once.
  3. Remove 1/2 inch from all of your measures once you’ve taken them all.
  4. It is necessary to create your storms to the longest measures first, and then scribe the shorter portions after the frame has been completed, if your windows are much out of square with each other.

That is something we will discuss later. You’ve taken your measures and double-checked them, right? Okay, let’s go to work on creating something!

Building the Frames

This project will need the use of a few simple tools and supplies that are both readily available and reasonably priced:


  • Mitre Saw or mitre box
  • DrillDriver Combo
  • Mitre Saw or mitre box
  • 1 sheet of Plexiglass or Polycarbonate
  • 1/2′′ Adhesive Felt Roll
  • 1/2′′ Adhesive Felt Roll Wood screws, flush window clips, circular saw, random orbit sander, and sandpaper are all needed.

The 1 × 2 select pine boards we’ll be utilizing for these inside storm windows were chosen because I wanted to keep things as easy as possible for you. There is no need to pull them down or make any modifications with a table saw. These may generally be found at any home improvement store, such as Home Depot or Lowe’s. These are clean pine boards with no knots or other defects, so they will look fine even if you chose to leave them unpainted. Alternatively, you may prime and paint them to give them a more polished look.

The exact dimensions of each board are 3/4 inch by 1 1/2 inch, and this will be used to construct the frame for your inside storm window.

It’s a pretty straightforward design that doesn’t necessitate the use of complicated equipment.

Step 1 Cut to Length

Cut all four sides of the frame at a 45° angle on the ends so that the longest point of the mitre is equal to the longest length you measured (don’t forget to deduct 1/2′′ from the total length you calculated). Lay everything out on an assembly table or the floor to ensure that it all fits together correctly and that the joints are tightly sealed and fastened. After the frame has been completed, we’ll cut away any extra material to make room for windows that aren’t quite square.

Step 2 Assembly

In the video, I demonstrate how I installed three 3/8′′ fasteners in each corner joint using a corrugated fastener gun. These keep the frame in place firmly and are far faster than any other approach I have discovered. These fasteners are not my preference for outside work, but they are ideal for cabinet door construction and the installation of inside storm windows. Pocket hole screws (like I did in my earlier post on creating an external version of this storm window inDIY Storm Windows) or any other fasteners you want, such as mortise and tenon joints, dominoes, dowels, biscuits, or something else totally can be used to assemble your frame.

Step 3 Fit and Trim

Test-fit your frame in the window to check how it looks and how well it fits. It may be necessary to sand down any parts that do not fit with the expected 1/2′′ gap owing to the window being bowed or out of square. A circular saw may be used for greater alterations if the window is bent or out of square. Finally, give it a final sanding until you have a nice fit with a 1/2′′ gap all the way around. This would be the time to prime and paint the walls and ceiling. Alternatively, you may stain and varnish it if you want it to mix in with your window trim better.

Step 4 Glazing

Now that you have a frame, you’ll need something to keep the weather out, and you’ll have a few alternatives to choose from. In this situation, you would just place the frame down on the sheet of plexiglass and trace the contour of the frame onto the plexiglass using a sharpie. You could also choose a more expensive and long-lasting choice such as 1/8′′ thick plexiglass, which is what I did. Once you have the outline drawn out, I cut the plexi to be 1 inch smaller than the outline so order to maintain the plexi setback from the edge of the frame during assembly.

The Window Insulation Kit, which may be installed on the rear of the frame, is a less expensive alternative to using the window insulation kit.

To install the interior storm window plastic, you first apply double-sided tape around the perimeter of the backside of the frame of the window, then lay the plastic down securely and push it to the frame.

Cut away any extra plastic with a razor knife or scissors, and then heat the plastic with a hair dryer until it shrinks, resulting in a good snug fit and the removal of any creases. The plastic should be as taut as a drum when you’re finished, with no wrinkles or creases.

Step 5 Weather Sealing

You’ll want to place the self adhesive felt around the perimeter of the inner storm frame once you’ve achieved a proper fit on your frame. I use felt because it allows the frame to move in and out of position more easily, but you may use any form of foam or rubber gasket if you choose instead. Incorporating a few of short weatherstrip nails into a suitable location will assist to prevent the felt from coming loose over time. Check the fit once more, noting that it should be rather snug by this stage.

Step 6 Installation

The time has now come for the truth to be told! The fit of the storm may be so tight that it may be simply pressed into place with no fasteners required, which is ultimately the purpose for achieving that tight weather seal you desire. Utilizing flush window clips will provide additional protection in order to prevent it from slipping out or to accept a little off-fitting window. Remove the four clips from their packaging and screw two of them into the casing on each side approximately three inches from the top and bottom of the casing.

  1. The presence of these clips may not even be necessary in the case of a very deep window well and a tight fit.
  2. Take a deep breath and take pleasure in your new energy-efficient inside storm window!
  3. If you don’t already have these tools, the good news is that this set of equipment is quite simple and can be used for a wide range of projects other than the construction of inside storm windows.
  4. Please share your ideas with me in the comments section below.
  5. I’m looking forward to hearing from you!
  6. FounderEditor-in-Chief I enjoy renovating ancient buildings, working with my hands, and sharing the excitement of doing things yourself with people.

How to Build an Interior Storm Window

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  1. Incorporate these straightforward instructions for creating detachable internal storm windows (also known as “window inserts”) into your winter energy efficiency checklist.
  2. In particular, this is true in older homes or in homes that were constructed more hastily and without consideration for energy efficiency.
  3. If replacing your current windows with energy-efficient ones is not in your budget, you might want to consider adding storm windows on the exterior of your existing windows to provide an additional layer of heat retention and cold blocking.
  4. Another alternative is to install film window insulating kits.
  5. The shrink-film is often fastened to the window frame using double-sided tape.
  6. We, on the other hand, considered this to be a clumsy and ineffective method to energy conservation.

The adhesive that comes with the kits can cause damage to window frames, and the plastic never appears to shrink wrap evenly, so the whole thing has to be reapplied – and repurchased – every year, which can be expensive.

The Better Solution? DIY Interior Storm Windows

Consider making your own inside storm windows (also known as “window inserts”) as a pleasant alternative to pricey construction or low-cost options. In addition to providing adequate insulation without spending a fortune, this low-cost solution can be made to appear really attractive with a little attention to aesthetics. Here we demonstrate how to construct and install detachable inside storm windows or window inserts, which are constructed from the same shrink film that is included in a conventional window insulating kit.

It also has a far more appealing appearance and is twice as effective (because of the two layers).

Such inside storm windows can be especially beneficial if you are heating your home with a wood burner and want to ensure that all of the heat does not escape before reaching the rest of your home’s interior.

  • Temperature measured through a storm window.” data-medium-file=” ssl=1″ data-large-file=” ssl=1″ width=”1024″ height=”488″ data-large-file=” ssl=1″ width=”1024″ height=”488″ alt=”” data-id=”1474″ data-link ” srcset=ssl=1 1024w,ssl=1 300w,ssl=1 768w,ssl=1 2000w” sizes=”(max-width: 1024px) 100vw, 1024px” data-link=” srcset=” ssl=1 1024w, 300w, 768w, 2000w” sizes=”(max-width” temperature with window insert
  • Data-recalc-dims=”1″> temperature with window insert Without a storm window, the temperature would be higher.” data-medium-file=” ssl=1″ data-large-file=” ssl=1″ width=”1024″ height=”488″ data-large-file=” ssl=1″ width=”1024″ height=”488″ alt=”” data-id=”1475″ data-link=” srcset=” ssl=1 1024w,ssl=1 300w,ssl=1 768w,ssl=1 2000w” sizes=”(max-width: 1024px) 100vw, 1024px” src=” ssl=1 1024w, ssl=1 768w, 1024px” data-id=”” Temperature without the use of a window insert
  • Data-recalc-dims=”1″>

To summarize our design, we’ve created a wooden frame that is just slightly smaller in size than the window aperture. On both sides of the frame, shrink film has been applied. Weather stripping is installed along the outside border of the frame. This provides for a little margin of error in measurements, makes the frame easier to install and remove, and gives a good flexible seal that will fill in gaps where they are needed, among other benefits.

Determining the Size of your Interior Storm Window Insert

The quantity of supplies specified in these instructions will not be included since those numbers will be determined by the size of the storm window you intend to construct. You’ll need to take a few important measurements in order to establish the final size of your finished storm window.

  • To begin, measure the internal width and height of your window frame (from inside the lip into which you will put your window insert)
  • Next, measure the external width and height of your window frame (from inside the lip into which you will insert your window insert). Second, deduct 1/2 inch from each of the measurements you’ve taken. As an example, if your opening is 36 inches wide by 24 inches tall, your final measurement should be 35 1/2 inches wide by 23 1/2 inches tall. A modest 1/4 inch gap all the way around is allowed, which will be covered with weather stripping.
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Supplies for Building your Interior Storm Window Insert

While the quantity of materials required for your window insert will be determined by the measurements of your window, you will require the following fundamental components for each window insert:

  • 12′′ timber in lengths long enough to accommodate the size of your frame is required (measured with the method above). You should keep in mind that you only want a single piece for each side, so you may need to cut more than one length to obtain all of the pieces you’ll need. 1-2 sheets of window shrink film are required. You may be able to acquire both sides of your window film from a single sheet of window film, depending on the size of your window. You may also purchase the film in bigger quantities and have it cut to your specifications. 1 roll of double-sided tape, which can either be included with the window film or purchased separately
  • Weather stripping tape that is 1/2 inch wide and 1/2 inch thick–enough to wrap around the whole external perimeter of your window
  • The use of clear packing tape OR genuine handles or pulls to serve as handles while removing your storm windows is recommended.

You’ll also require the following equipment:

  • Use a saw (either by hand or by power) to cut your wood to the desired length
  • Clamps to help you line your corners and keep the frame together while you’re putting it together
  • Glue for wood
  • To link the joints of the window frame together, you’ll need screws. Use a drill and a tiny bit to pre-drill holes in the window frame for the screws to go through. A hammer or rubber mallet
  • A measuring tape
  • And other tools. In case you wish to match the frames to your windows, you’ll also need paint and a paintbrush. The use of a hair dryer
  • The shrink film is cut using a utility knife.

How to Build the Removable Interior Storm Window Inserts

Now that you have your measurements and supplies, building the storm window is fairly straightforward. There are six basic steps:

  1. Construction of a rectangular frame
  2. Painting or staining of the frame, if desired
  3. Attach the shrink film on both sides of the object
  4. To make removal easier, attach a “handle” or a tab. Install the weather stripping around the exterior of the building
  5. Install the window insert that you purchased.

Building the Frame:

To construct the frame for your storm window, follow these steps:

  1. Measure and cut four 12-inch pieces of wood – two for the width and two for the height – according to the specifications given above
  2. You have the option of cutting a 45 degree angle at each end of your pieces (while ensuring that the longest side retains the whole length), or you can simply butt the ends of each piece together and screw them together at the corners to finish the job (this is the approach we took and it works perfectly fine). If you’re butting the pieces together, shorten the length of the shorter parts by twice the breadth of the wood you’re working with
  3. Lay out the entire frame on a big, flat surface, aligning your corners as you go. Clamp the pieces together to hold them in place while you apply wood glue at each joint as you go. To secure the corners together, pre-drill holes in the frame and insert screws (the screw would be inserted from both sides of the frame and far enough into the item that joins to it)
  4. Allow for a partial drying of the wood glue (15 minutes or more)

Painting or Staining the Frame

You should paint or stain the frame now if you want your frame to match the window into which you will be fitting the frame. Preparation with primer may be necessary depending on the type of paint you are using. Before moving on to the next stage, be sure you have followed the drying time instructions on your paint can. Keep in mind to paint both sides of the canvas!

Attaching the Shrink Film to the Frame

  • Double-sided tape should be used. “data-medium-file=” ssl=1″ data-large-file=” ssl=1″ width=”1024″ height=”488″ data-large-file=” ssl=1″ width=”1024″ height=”488″ alt=”” data-id=”1478″ data-link=” srcset=” ssl=1 1024w,ssl=1 300w,ssl=1 768w,ssl=1 2000w” sizes=”(max-width: 1024px) 100vw, 1024px” data-link=” srcset=” ssl=1 1024w, 300w, 768w, 2000w” sizes=”(max-” data-recalc-dims=”1″> Apply double-sided tape to the surface of the film
  • Position the film on top of the double-sided tape. “data-medium-file=” ssl=1″ data-large-file=” ssl=1″ width=”1024″ height=”488″ data-large-file=” ssl=1″ width=”1024″ height=”488″ alt=”” data-id=”1479″ data-link=” srcset=” ssl=1 1024w,ssl=1 300w,ssl=1 768w,ssl=1 2000w” sizes=”(max-width: 1024px) 100vw, 1024px” data-link=” srcset=” ssl=1 1024w, ssl=1 300w, ssl=1″ data-recalc-dims=”1″> put the film on top of the double-sided tape and shrink the film using a hair dryer. “data-medium-file=” ssl=1″ data-large-file=” ssl=1″ width=”1024″ height=”488″ data-large-file=” ssl=1″ width=”1024″ height=”488″ alt=”” data-id=”1481″ data-link=” srcset=” ssl=1 1024w,ssl=1 300w,ssl=1 768w,ssl=1 2000w” sizes=”(max-width: 1024px) 100vw, 1024px” data-link=” srcset=” ssl=1 1024w, ssl=1 300w, ssl=1″ To shrink the film, use a hair drier (data-recalc-dims=”1″>).

Attaching the shrink film to the frame will be similar to how you would install a window kit to a standard window. If you are using a kit, we recommend that you follow the instructions that came with the package.

  1. Working on a clean, dust-free surface, apply the double-sided tape to one face edge of your window frame, one side at a time, being sure to cover the exposed side of the tape for the time being. On both sides, cut the window film into a piece that is only a few inches bigger than the frame of your window. The backing of your double-sided tape should be removed. When you have finished stretching the window film over the whole frame, firmly push it down into the double-sided tape (beginning from one side and pulling toward the other side might assist ensure a smooth installation). Then, using the hair drier, shrink the film and adhere it to the frame tightly. Using a utility knife, carefully trim away any extra window film from the margins of the window. Replicate the technique on the other side by reversing the frame

You should now have a frame with window film on both sides.

Attaching a “Handle” to your Interior Storm Window

This step is frequently overlooked, but it makes springtime removal more simpler and less time-consuming. Briefly said, you’ll want some form of “handle” or “tab” that will allow you to grip the window and pull it out. For the “tab,” we used a folded piece of transparent packing tape, leaving one end with the adhesive tape exposed so that it could be attached to the glass to form a “tab.” Once implemented, these tabs are scarcely discernible from the rest of the page. Put this on first, then apply the weather stripping on top of it to complete the installation.

If necessary, the tabs can be cut back using scissors once they have been fitted.

Keep in mind to include a pull tab or lever that will allow you to quickly and conveniently remove the storm window.

Applying the Weather Stripping to the Perimeter of your Storm Window Insert

Lastly, wrap the perimeter of your storm window with weather stripping tape to complete the installation process. Keep in mind to overlap at the corners to ensure that the end result has a seamless seal.

Installing your Storm Window Insert!

After it has been constructed, you may install your storm window by carefully forcing it into the aperture, beginning on one side and working your way down. It may be necessary to wiggle it a little in order to get it into position and enable the weather stripping to properly compress into position. Test the temperature before and after installation, and then report back to us on how much heat you saved as a result. Carrie Williams Howe works as an instructional leader during the day and as an aspiring homesteader on the weekends and evenings.

She is the founder and editor of Farm How-To, as well as the author of The Happy Hive, a blog about her family’s homestead life.

Mother Earth News

one-half of a whole This winter, these internal storm windows will do a great job of keeping the cold away. PHOTO CREDIT: NATE SKOW 2 out of 2 While the glue is setting, use nails to hold the edges of your storm window frames from shifting. Is it possible to get rid of your single-paned and leaky windows without spending a lot of money? NATE SKOW Here’s a simple approach to substantially increase the efficiency of your windows while also reducing harmful condensation without investing a lot of time or money: Using wood casing, window film, and foam adhesive, you may construct detachable internal storm windows.

  1. Scraps of this material are frequently thrown away by contractors.
  2. Decide whether you want the inside storm window to be installed within the existing window casing or on top of it by measuring the opening.
  3. Take horizontal and vertical measurements of the inside of the window frame and deduct a quarter inch from each measurement to get the desired result.
  4. If you’re working with square material, you may utilize a rabbit joint (also known as a lap joint) at the ends of your pieces.
  5. I like to use some nails pounded into a workbench at the outside edge of the frame to hold it in place and keep it square, but you may use whichever method you choose.
  6. To ensure that each corner pair matches, it is critical that this spline cut be made in exactly the same relative place on all of the trim pieces.
  7. Place the frame pieces between the nails once again and glue the splines in place with the glue gun.
  8. Lightly sand all of the rough edges of the trim, and then “dry fit” the frame into the window opening to ensure that it fits properly and securely.
  9. Install the film in the manner indicated by the manufacturer, and then shrink the film to the desired size.

Last but not least, establish the appropriate thickness of foam tape to utilize. When you put the storm window into the window frame, you want it to be snug, but not so snug that the tape rolls off when you remove it. Ames, Iowa resident Mark Clipsham

Published on Aug 19, 2010

The vast majority of us have no idea where our food originates from, let alone all of the elements of the supply chain that must work together to deliver us that food in the first place. To the contrary, farmers markets provide shoppers with a short route from farm to market, direct relationships between farmer and consumer, and complete transparency throughout the process. During this episode of Mother Earth News and Friends, we speak with Kyle Ferlemann, who discusses emergency preparedness in urban and suburban areas.

He is a master plumber who has also served in the military for 33 years and taught elementary school, so he is well-qualified.

Copyright 2022, All Rights Reserved |

Copyright 2022, All Rights Reserved |

Interior Storm Windows

The owners of this mid-century home chose Indow internal storm windows to improve the energy efficiency of their existing outward-opening casements in order to save money on energy bills. If you want to decrease energy loss as a major aim, an internal storm is a viable option, especially if the original sashes are still in good condition. These interior retrofits are technically known as “storm windows,” but the term is a misnomer since, while they shield the main window from condensation and increase R-value, they do not provide outside protection against the weather.

  • Interior storm panels are often less expensive than outside storm panels.
  • In the bathroom, an inside storm window from Indow keeps the drafts at bay.
  • An internal panel provides performance that is comparable to that of a premium replacement window.
  • A wood replacement window costs $71–109 per square foot, whereas a vinyl replacement window costs $65–87.

The Difference Between Interior and Exterior Storm Windows

The installation of interior storm windows, which are put on the inside of existing window openings, is frequently more cost effective than the installation of exterior storm windows, which are installed on the outside of your windows. Installing a properly-sized inside window, according to two independent studies conducted by the U.S. Department of Energy and Portland State University, can reduce heating and cooling expenditures by as much as 20 percent or even more. In fact, according to Sam Pardue, such performance is largely due to the fact that tenants were so much more comfortable (thanks to the warmer glazing and less drafts) that they dropped their thermostat once the inserts were put.

See also:  How To Install Interior French Doors In Existing Opening

When an internal storm occurs, indoor air movement is prevented from reaching the principal window.

Innerglass Window Systems has created a suitable internal storm window for this application.

It is also advised to use interior storms to help with soundproofing.

Low-E coatings increase the R-value of windows even further by transforming it into a heat mirror. Interior storms installed by respectable businesses are authorized by most building regulations for egress (escape in an emergency) and for entrance by firemen since they are easily removed.

Acrylic or Glass?

Storm windows are available in a variety of materials, including glass, acrylic (such as Plexiglas), and polycarbonate (such as Lexan). ‘Glass feels heavy and chilly,’ I say. “We use acrylic glazing for internal windows that are not exposed to the elements,” explains a distributor for Climate Seal. “Acrylic has higher insulating capabilities than glass of comparable thickness, and it is significantly lighter and stronger than glass of equal thickness,” he adds. Polycarbonate is often reserved for use on external window panels that must be impenetrable for reasons of safety and security.

The majority of modern acrylics are not yellow in color, however they can get foggy if scraped or cleaned excessively.

For optimal performance, Indow recommends that customers remove and reinstall inserts at least twice a year in order to reseat them; panels minimize air conditioning burden and may be used all year.

Storm Window Companies

These firms are well-known for the effectiveness of their retrofit internal glazing that is acceptable for older buildings:

Allied Window

Allied “invisible storm windows” are custom-made for usage on the inside or outside of a building. All of the glazing choices are accessible to you (glass, tempered, tinted, acrylic, low-E, polycarbonate). When the magnetic panel is placed, it is fitted into an upper channel that has been screwed in place, and then forced into jamb stops. One variant has a bottom panel that can be opened vertically for ventilation, while another features sliding panels that may be used with steel casement windows.

Custom colors, screens, and unusual forms and muntin combinations are also available as options.

Thanks to Indow for their assistance.


It is common practice for Indowinterior storm panels to be custom constructed to exactly suit non-standard and out-of-square windows; arched and circular windows may also be manufactured. In order for the frame to be complete, an unobstructed flat edge with a depth of at least 5/8′′ must run around the whole circumference. The window panels are made of acrylic and are bordered with silicone compression tubing, which provides a spring force that holds the inserts in place even when there is no mounting bracket attached.

For example, the acoustic grade reduces outside noise by more than 70%; the shade grade performs similarly to low-E glass and is recommended for hot climates; their museum grade blocks ultraviolet light; and their privacy grade is translucent, allowing light to pass through while maintaining privacy.

Climate Seal

Climate Seal has long been recognized for its commercial and historic preservation work, and it is now expanding into the residential market. The technique eliminates the need for clips and screws by utilizing magnetic connection with mouldings and a bellows design. There are four lines: It is used for temperature management and has a quick payback period (18′′ acrylic). The use of acoustic (14″ acrylic with a specific weatherstrip) decreases sound intrusion significantly. The Preservation Series is designed to reduce the aesthetic impact while still providing museum-level UV protection.

For instance, one of the products available is a two-panel self-storing window with an operable bottom insert.

Innerglass provided the image.

Innerglass Window Systems

Innerglass manufactures inside panels that are firmly compression-fitted to the structure and serve as a vapor barrier. It is necessary to insert a header channel at the top of the window frame; compression sides are then compressed into the channel and pushed from top to bottom. Blocking pins are put into tiny holes drilled on either side of the window face to prevent the window from being opened. Vinyl is used to frame the glass panes. The firm also manufactures double-hung interior storms that operate on three sides with thin tracks; the sashes are readily removed and are the same height as the original window’s meeting rail.


Mon-Rayhas a 500 Series of aluminum storm windows that may be utilized for inside applications in addition to their different external storm window lines. They are available in a number of different painted and anodized finishes. Removable panels, horizontal sliders, and double-hung windows are among the several options available. The panel is placed in a channel that is screwed to the wall. They are able to create specific radius shapes and miter angles upon request. Additionally, screens are provided.

DIY Interior Storm Windows

Because interior storm windows conserve energy, your heater or air conditioner can run more efficiently, and your house will be warmer or colder depending on the time of year you use them. Interior storm windows are a fantastic choice for historic homes since they do not cover the windows on the outside of the building. Furthermore, inside storm windows are significantly easier to operate on second-floor windows than outside storm windows.

Why use interior storm windows?

Interior storm windows provide an air gap that prevents hot or cold air from entering or exiting your home, hence reducing energy consumption. During the calmer months, it is a good idea to remove internal storm windows to allow the home to breathe more easily and effectively.

Types of interior storm windows

Shrink wrap is made of plastic. Panels made of glass or plastic. When a hairdryer is used to heat clear plastic shrink film, it is stretched across a window or window frame. Interior storm windows with glass or plastic panels might have metal or vinyl frames, depending on the style. They can also be used without a frame for a more translucent appearance. Making your own internal storm windows out of plastic shrink film is simple and inexpensive. Step 1 – Go to the hardware shop and purchase the wood frame that will be needed for building the screens as well as the plastic shrink film.

Step 3 – Using a heat gun, stretch the plastic shrink film around the picture frame.

The interior storm window can be attached to the frame with double-sided tape, or it can be stapled to the frame with plastic shrink film, as shown in Step 4. Step 5–Mount the finished interior storm window onto the existing window frame by screwing clips into the window frame.

Installing glass or plastic panels

Interior storm windows in frames or panels without frames are both kept in place on the inside of your home’s window by metal or vinyl clips, which are attached to the frame by metal or vinyl clips. Step 1 – Drill holes all the way around the frame of the current window. Step 2 – Attach the clips to the window frame with screws. Step 3 – Attach the internal storm window to the wall.

Window Savers

Window Savers help to reduce drafts, conserve energy, and block out noise from the outside. Additionally, they will improve the comfort of your house while also saving you money! Window Savers are indoor storm windows made of Plexiglas that are delivered to you in DIY kits that are simple to assemble. Their look and function are on par with the greatest custom-built inside storm windows available, yet they cost a fifth of the price of custom-built storm windows. Even though the normal storm window might cost hundreds of dollars, Window Savers are the most affordable and high-quality alternative available!

Assembly is so simple that anyone can do it.

It is not available for purchase in shops, and we are so certain in its effectiveness that we provide an unequivocal money-back guarantee.

What will they do for me?

Your heating and air conditioning expenditures will most likely decrease by 30 to 50% as a result of your efforts. You will dramatically reduce the amount of noise in your house or business by minimizing drafts, condensation, and radiant cold. You will also notice a significant reduction in the loss of both hot and cooled air. However, there is a possibility that you may save much more money. As the draftiness of a window rises with age, the amount of money it costs to heat and cool your home can become catastrophic.

They restore the functionality of your old, worn-out windows, reducing your energy losses more than anything else you could do, even replacing the windows themselves.

Once it is paid off, you will be able to earn money on a yearly basis.

How do they work?

Window Savers are magnets that hold the Plexiglas in place. They work by trapping “dead air” between the Plexiglas and the main window, which effectively eliminates any drafts. The heat passed through the glass is reduced by half as a result of the air gap. The magnetic seal around the edge prevents any air leakage, which can result in a loss of up to twice as much as before. Air gaps of between one and five inches are considered optimum.

When installing Plexiglas, it is essential that it be given the ability to expand and compress as it does so. Given that acrylic moves more than most other construction materials, magnetic mounts are an excellent choice. They enable for movement without allowing the seal to be broken.

How are interior storm windows better than exterior?

Exterior storms are preferable to no storms at all, yet they are problematic in their design. They must be constructed with “weep” holes to allow moisture to drain to the outside. If the primary window is also allowing air to flow through, these gaps might become a source of drafts. Any principal window that has been in use for more than ten years is almost probably drafty. Exterior storm windows have a number of issues as well. As a starting point, they frequently detract from the outside aspect of the structure.

Third, because they are exposed to the elements, they age quickly and the weather stripping on their windows wears away.

Interior storm windows prevent humid room air from reaching the cool primary window, hence preventing condensation from forming on the primary window.

As a result, temperatures remain more steady and insulation is improved.

How durable are Window Savers?

Designed to survive for a long time, they are extremely durable. Our interior storm window kits have always been designed with durability and performance in mind, and this has been the case from the beginning. Window Savers are built to be as long-lasting as we can make them. Although we cannot make lifelong promises regarding our adhesives or plastics because the chemical industry does not provide guarantees, we do provide a one-year warranty on our products. Our materials include extra-heavy magnets, galvanized steel, exterior-grade trim tape, and acrylic adhesives, all of which outperform (and are less expensive) than their less expensive competitors.

Increased performance can only be achieved by installing triple-paned or rare-gas-filled glass in draft-free windows, which is a significantly more expensive option.

This has been tried and tested by the vast majority of our clients.

DIY Indow Windows (Interior Storm Windows) with the Magnetseal Kit

Our house is over 100 years old, has primarily original single-paned windows, and is quite drafty due to the age of the building. There are a couple of windows that I don’t want to cover with curtains or blinds since they are so drafty, but because they are so leaky, I wanted to insulate them in some way. The firm Window Windows, which is headquartered in Portland and specializes in creating custom window inserts, has received positive feedback from customers. These inserts are especially useful for ancient windows that you don’t want to replace or risk harming.

I believe Indow Windows are a fantastic alternative, but the thought of paying over $1,000 on bespoke inserts for five windows, two of which are tucked away in the basement, did not appeal to me.

Since all of the windows in issue face towards the backyard, soundproofing was not my major concern.

However, it just so happens that soundproofing aficionados are EXTREMELY passionate about window insulation solutions, and I was able to learn the most from their forums and websites. My primary priorities are as follows:

  • Insulate the windows while causing the least amount of harm to the window frame. Create an insert that is detachable so that we may have access to the entire window during the warmer months. Maintain a budget of around $100 each window.
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My final decision was made after much study, and I chose the Magnetseal magnetic window insulation kit since it appeared to be a good blend of simplicity and value for my needs. Each window, which cost $3.50 per linear foot, required around $45 in materials, not counting the plastic sheet, which I purchased separately from a local plastic provider for an additional $5. (TAP Plastics). In order to accommodate the way my windows are structured, I decided to merely frame in the sides and the top of my window.

However, you will have to place weatherstripping tape or other filler on the bottom of your insert in order to properly seal the window in if you pick this option.

Here’s an example of one of the windows before it was built (on the left) and one of the finished windows (on the right): Overall, I was pleased with the ultimate product, and the procedure itself wasn’t too difficult to endure.

Of course, I made a number of blunders along the road, which I’ll share with you in the instructions so that you can avoid making the same mistakes.


  • Magnetseal framing and magnetic tape (I recommend contacting Super Soundproofing Co, or whichever seller you order from, because they will need your window dimensions before cutting your frame strips)
  • Magnetseal framing and magnetic tape (I recommend contacting Super Soundproofing Co, or whichever seller you order from, since they will need your window dimensions before cutting your frame strips)
  • The window opening should be covered with a clear plastic sheet (it is strongly recommended that this be done after you have installed the Magnetseal kit so that you can get the exact dimensions)
  • Tin snips or hacksawto cut the steel mounting frame to size
  • Drill and bits
  • Measuring tape
  • s Pencil


  • Caulkor or another filler can be used to close any gaps that remain between the mounting frame and your window frame. It is necessary to use weatherstripping tape to seal the bottom of your final insert if you are just framing three sides, like I did. to conceal a visible magnet strip on one side of the final insert (the adhesive side of the magnet tape is white, but there are visible air bubbles against the plastic, which makes it seem tacky)
  • White paint or electric tape to hide the visible magnet strip on one side of the finished insert


1. Cut your mounting strips to the appropriate length for your window. If you’re working on many windows, don’t make the same mistake I made and start with the most visible window. Some of you may be aware with Newton’s First Pancake Theorem, which states that, similar to pancakes, the first batch of everything you produce will be lumpy and odd, thus it’s far better to start with the window you don’t care about and reserve the best window for last. With each new window, you become better and quicker.

  1. Consider all possible positioning possibilities before cutting your strips, especially if your windows are elaborate or odd in any way, before you begin cutting your strips.
  2. Even before I received the kit, I believed that I would use the exterior mount since it would provide me with greater coverage over the window and so provide better insulation.
  3. The fact that the screws were hidden by the inner mount was also appealing to me.
  4. Internal mounting (on the left) or exterior mounting (on the right) (right).
  5. Attach the mounting frame to the wall.
  6. It is sufficient to use a 1/8′′ bit, and mounting screws are supplied in the package.
  7. Whenever I needed to, I used my tin snips to cut out slots around 4′′ from the end of the strip using my scissors.

I started by putting in the two side mounts, and then I measured, cut, and put in place the top mount.


It’s important to wash away any filler that may have gotten on the mounting frame, since this might interfere with the magnetic strip’s ability to stick to the frame in the future.


Always remember to allow for the expansion of plastic, which means that for an interior mount, you’ll probably want to have the plastic cut around 1/8′′-1/4′′ shorter, depending on the size of the window (consult with your plastics supplier to determine the exact amount).

Because of this, they advised that I use a 3/16′′ thickness to avoid any bending.


This stage is rather straightforward.

However, you should do this AFTER you have installed the glass, in case the weatherstripping adds too much mass and interferes with the magnetic alignment at the top of the window.

Hang your window from the ceiling!

I intend to paint or use white electric tape to conceal the magnetic tape that can be seen behind the plastic sheet that is already in place.

In addition, I need to locate a very thin weatherstripping tape to cover the bottom border of the insert because the one I purchased added an excessive amount of height to the completed product.

ADDITIONAL INFORMATION HAS BEEN ADDED: Just a few days have passed since I placed these windows in place and the change in the overall comfort of the house is night and day.

A calming effect has been achieved throughout the space, and there are no longer any stray drafts blowing around the kitchen. This project receives a perfect score of 10 out of 10. I’d do it again in a heartbeat.

Interior Storm Windows

We are all aware that installing a storm window to insulate a drafty window is the most effective method of doing so. Despite the fact that the storm window protects your pricey wood window from the weather, it makes no difference to its curb appeal. You might want to show off your original wood windows if you still have them, rather than hiding them behind furniture or other obstructions. With an internal storm window, you can show off your bare window while still conserving energy. Interior storm windows allow your primary windows to face the world in all their splendor, avoiding the “blank stare” problem that can occur when split light windows are covered with a storm window.

Interior storm windows may be readily removed for storage and cleaning during the warmer months.

Interior storm windows are an excellent solution to this problem.

This will ensure that your out of plumb windows are measured correctly and will fit perfectly.

Building Interior Storm Windows

Despite the fact that I have a lot of work to do on the foyer and entrance renovations, I made a little detour to construct some inside storm windows for the office/laundry. Many residents in the United States are experiencing record-breaking low temperatures. While our weather is seasonable in our part of the world, it is still quite cold. Building internal storm windows has been on my “to-do” list for quite some time, and the recent cold spell has pushed me to get started as soon as possible.

Although it is not as visually appealing, plastic sheeting applied with painter’s tape also works really well.

Beginning at 10:23, there is a lengthy Q & A session with the hosts.

When I refine a procedure, I will upload it, record it, and make updates to it.

What are Interior Storm Windows?

Draft-blocking inside storm windows are designed to fit tightly into the window jamb and provide an additional layer of protection against drafts. Alternatively, in extremely hot areas, they can assist in keeping the air conditioning inside rather than allowing it to escape via poorly fitting windows–modern or not. In Florida, some of my window restoration associates swear by the benefits of installing internal storm windows during the scorching summer months. As previously said, there is a comprehensive QA section on the video, but I’d want to answer one extra often asked topic here on the blog.

  • The answer is that it isn’t actually.
  • Nevertheless, when it comes to maintaining your original wood windows and keeping out the harsh weather, outside storm windows are the first line of defense to look out for.
  • In my particular circumstance, I have triple-track aluminum storm windows that are ill-fitting.
  • With the aluminum triple-tracks, I’m always juggling the needs of my passengers for comfort and fire-exit safety.
  • However, the window over my desk is still in the basement workshop, where it has been since I completed and put it opposite the clothes drier.

Above my workstation, there is a window that opens. You must be wondering how it is possible that I have written so many words and have yet to show you anything. (Put down the pen, Stacy!)

Video: Building Interior Storm Windows

Following your viewing of the video, you may decide to make some changes to your original plan. The specific supplies I used, on the other hand, are stated below:

  • Wood — I utilized 1.5′′ wide X 1/2′′ thick wood stock for this project. The lengths I used for two internal storm windows were four 8-foot lengths, but your windows may require something different. Plexiglass sheets– I used two (two windows) of 36′′ X 72′′ Plexiglass sheets that I had cut to size at Lowe’s for this project. If you’re using plexiglass, be sure to inspect it thoroughly for cracks. To adjust for the thickness of my wood, I substituted shorter screws for the longer ones on each window, totaling eight on each window. When I talked about felt weather stripping in the video, I was referring to foam weather seal. Listed below is a link to my recommendation: Holders for storm windows


These are the tools that I have and have utilized throughout my career. This project, on the other hand, may be performed with just hand tools if the method of attaching the plexiglass is modified. Instead of inserting it into a rabbet, you’ll just lay it on the wood, maybe with a thinner weather seal, and fasten it with the half turn buttons on the underside.

  • Miter saw
  • Router for the rabbets – I also have this bit set
  • Miter saw for the rabbets For this purpose, a 1/2′′ rabbeting bit with a proper-sized shank or collet is all that is required to set the shank to the appropriate size. The shank on my Ryobi router is 1/4 inch in diameter. Kreg pocket hole jig
  • Kreg pocket hole jig Cordless Drill – I have this set, and I am really pleased with its performance. For my delicate lady hands, it’s the ideal fit. You may purchase the drill alone, but I would recommend spending the extra money to include the impact driver as well.


There are a variety of ways in which you might adapt my design to create your internal storm windows.

  • Make a cross piece in the center and use glass instead of plexiglass for a more elegant look. Corners should be mitered
  • As an alternative to pocket hole screws, use metal brackets to attach the corners. Interior edges should be routed for a more pleasing appearance. Instead of purchasing 1.5′′ wide stock, you may rip your own boards. Make modifications to your cuts to include weather-stripping all the way around the outside border of the inside storm
  • If your jamb permits it, do so. Alternatively, if you do not have a good jamb, you may install the storm windows against the trim instead. However, even if the storm and window trim are not flush or close to flush, the function will be identical
  • The appearance will be less appealing.

Those are just a few ideas that came to me as I was driving. Keep in mind that progress is more important than perfection. It was only for fun that I wanted to provide a few of thermal temperature gunreadings taken with the inside storm windows in place. The temperature of the room is the most important number. It was before I cranked up the thermostat for the day that I took the readings. This is the window with the sashes on either side of it. This is the view via the window over my desk that does not have sashes.

The temperature differential between the sides without the sashes over my desk was between 15 and 25 degrees, and there was usually a small breeze.

Please do not hesitate to contact me if you have any queries.

Make a note of this thought for later.

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