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

Part 4: Interior Window Airsealing

Part 5: Zero-Reveal Taping

Part 6: Window Installation Quality Control

Tools of The Trade

Product	Interior/Exterior	Perm Rating	UV Exposure Time	Widths
TESCON VANA	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
TESCON PROFIL	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
TESCON PROFECT	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
EXTOSEAL ENCORS	Exterior	0	6 months	6", 8", 12"
Product	Interior/Exterior	Perm Rating	UV Exposure Time	Widths
CONTEGA SOLIDO IQ	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
CONTEGA SOLIDO IQ-D	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.
CONTEGA FIDEN EXO	Exterior	<6.5		9/16", 13/16", 2 1/2"
	A heavy-duty expanding foam tape for windows

QUOTE MY PROJECT

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.