If you re insulating an attic the knee walls are important.
Insulate attic knee walls.
The best materials for the attic and thus the knee wall are spray foam fiberglass and cellulose.
Knee walls are found in many older houses where the ceiling on the top floor is an attic or.
One of the best methods is rigid foam board with sealed joints over insulation in the knee wall.
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.
If you plan to insulate the roof deck of your attic then you would use spray foam or fiberglass batts.
This method can be made to work but the necessary air sealing details are demanding and fussy.
There are two ways to insulate triangular attics behind kneewalls.
There are as many ways to do it as there are people who do it.
Insulating knee walls other spaces in the attic.
A better approach is to insulate the roof slope above the attic.
This is not very easy in most of the older houses we work on because the hatches and attics are too small to get rigid foam board through.