They are short walls usually no more than 3 feet high used to support the rafters in roof construction with attic space behind them.
Insulate attic knee walls.
There are as many ways to do it as there are people who do it.
Knee walls are found in many older houses where the ceiling on the top floor is an attic or.
Insulating only the attic roof rafters and the walls at the end of the attic is one method some use to insulate the knee wall area underneath but carson dunlop author of principles of home.
Insulating knee walls other spaces in the attic.
A better approach is to insulate the roof slope above the attic.
If you re insulating an attic the knee walls are important.
There are two ways to insulate triangular attics behind kneewalls.
This method can be made to work but the necessary air sealing details are demanding and fussy.
If you plan to insulate the roof deck of your attic then you would use spray foam or fiberglass batts.
The best materials for the attic and thus the knee wall are spray foam fiberglass and cellulose.
The traditional approach is to insulate the kneewall and the attic floor behind the kneewall.