Windows might make you nervous. They’re big, heavy, fragile—and in a high-performance building, they’re the most expensive components. But that cost delivers real value: high-performance windows offer exceptional comfort and energy efficiency, helping reduce reliance on HVAC systems. Unlike mechanical equipment, windows have no moving parts to break and no operating costs.
Your Windows Are Nice, But How's Your Install?
A great window is only as good as its installation. Proper installation protects not only the window investment but also the building enclosure. Airtightness, correct flashing, seasonal vapor drive, and frame insulation all play a role in long-term performance. Even modest windows benefit from a careful install—boosting comfort, efficiency, and durability.
This post links to each of the subject areas we've written about to help you prepare for simple and effective high-performance window installations:
Part 1: How to Prep the Rough Opening
Part 2: Positioning the Window in the Rough Opening
Part 3: Exterior Window Taping
Tools of The Trade
Product | Interior/Exterior | Perm Rating | UV Exposure Time | Widths |
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Both | 8 | 6 months | 2 3/8", 3", 3 7/8", 5 7/8", 7 7/8" |
The all-around tape for any airtight project. Use to tape flat seams on membranes or sheathing. | ||||
Product | Interior/Exterior | Perm Rating | UV Exposure Time | Widths |
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Both | 8 | 6 months | 2 3/8" |
The essential window airsealing tape with 3 backing release strips for precise corner and edge taping | ||||
Product | Interior/Exterior | Perm Rating | UV Exposure Time | Widths |
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Both | 8 | 3 months | 2" |
Like TESCON PROFIL, but slightly thinner width, plus pre-folded on the roll for a quicker tape install | ||||
Product | Interior/Exterior | Perm Rating | UV Exposure Time | Widths |
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Exterior | 0 | 6 months | 6", 8", 12" |
Product | Interior/Exterior | Perm Rating | UV Exposure Time | Widths |
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Both | < 0.13 - 8 | 8 months | 3 1/8", 5 7/8", 11 3/4" |
A humidity-dependent window tape for interior OR exterior airtightness with smart vapor control. Doesn't need primer for adhering to masonry substrates. | ||||
Product | Interior/Exterior | Perm Rating | UV Exposure Time | Widths |
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Both | Vapor variable material < 0.13 - 8 US perms | 8 months | 3 1/8" |
A humidity-dependent window tape for interior OR exterior airtightness with smart vapor control. | ||||
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Exterior | <6.5 | 9/16", 13/16", 2 1/2" |
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A heavy-duty expanding foam tape for windows |
Next Steps
Now you've got the tools you need to look at a window and judge the best method for weatherproofing and airsealing. You still need to get your hands dirty and wrap your head around a real installation. Check out some of the following videos to help it all sink in.