The Home Spot

How to insulate sliding glass doors

The era in which wooden doors represented wealth and prestige is long gone. These days, sliding glass doors are found in many residences. They are practical and aesthetically pleasing and they let in sunlight to warm the house but they may be the primary cause of your inability to keep a consistent indoor temperature for an extended period. There is a significant probability that your sliding glass door is letting warm air out during the winter and letting hot air in during the summer.

Even though you may have chosen the best type of glass, insulation is still necessary to reduce energy loss and improve efficiency/effectiveness. And that brings us to ask “how to insulate sliding glass doors?” Here are six ways that answer that.

Vacuuming The Sliding Door Track

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Maintaining the channels or tracks of the sliding glass doors clean is the simplest way to insulate them and stop them from leaking air into the house. Every time you step over the door track, dirt and small pieces from your shoe fall into the track channels. So whenever the door is closed or opened, the debris on the track will be trampled. Thus, there will be a minor infiltration of drafts via the bottom of the door.

To prevent the trash from accumulating in the channels, we advise you to vacuum them as frequently as possible and remove your shoes on a mat outside the door before entering your home to ensure that it slides completely and seals effectively.

Add Or Replace Weather Strips

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Using Weather Strips completely insulates the house. It stops cold air from entering the house and warm air from fleeing to the outside. Where there are frequent drafts between the sliding doors, weather stripping forms a seal and has no issues with moisture.

The three primary varieties of sliding glass door insulation strips on the market are V-type, foam, and rubber compression strips. All of these weather-stripping components form a seal between the sliding channel and the door, preventing rain, snow, and other elements from entering your home. In addition to normal doors, they can be used to insulate windows with single and double panes. However, with time, weather strips deteriorate, so ultimately they must be replaced.

Close your windows or doors to the outside to assess whether you need new or replacement weatherstripping. You shouldn’t be able to see sunlight entering through the seal when peering through the door’s cracks or you might have to swap out the old weather stripping.

Using Rubber Compression Strips

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Rubber compression strips are a type of weatherproofing tool that effectively seals sliding glass doors. The rubber compression strips will offer excellent waterproofing and airtightness, which means that the strips are airtight and resistant to moisture. Additionally, they are simple to cut to fit any sliding door channel’s length.

Re-caulk Your Sliding Door

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Caulking the exterior of your door frame is another option to insulate the sliding doors in your house. Look out for the caulking around the frames and where the doors contact the house, since caulk fades with time. If the caulk is damaged then it needs to be replaced. To ensure that your door frame is effectively sealed for the upcoming few years, you must use a caulking rope and a gel of high quality for this purpose.

Although sliding glass doors that are a bit old and have seen better days are most effectively insulated using this method.

Using Thermal Curtains

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Thermal curtains can assist in keeping your house cool throughout the summer by preventing hot air from entering through the door and windows. They can retain heat inside during the winter and prevent warm air from exiting. These insulated sliding glass door curtains can assist in regulating the internal temperature for extended periods, regardless of where you live whether in the freezing northern regions where the temperature might drop significantly during winter or in the hot and muggy south.

Therefore, you won’t have to be concerned about air leakage if you use an air conditioner in the summer or a heater in the winter. In addition to insulating your sliding glass doors, this can assist in lowering your electricity expenditure.

Making Use of Plastic Window Insulator Kits

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Plastic window kits can be used on sliding glass doors and windows to keep cold air out. You may trim the plastic sheeting to fit the sliding glass door regardless of its size or dimensions.

The plastic is fixed to the door frame with double-sided adhesive. You’ll use a hairdryer to heat the surface in order to shrink the plastic. By contracting and tightening, the plastic sheeting creates an insulating barrier from the outside.


The insulation of sliding glass doors is particularly an energy-efficient measure. It will help to maintain your home at a pleasant temperature even in the hottest or coldest conditions.

Any or all of the aforementioned reasons can support the successful insulation of a sliding glass door.

Trisha Mae Raymundo
Trisha Mae Raymundo

Senior Writer and Editor of The Home Spot.