Despite all the bad publicity reflective insulation is getting lately i like to use it quite a bit on knee walls.
Insulating a knee wakk next to an attic.
In this video michael shows how to use spray foam fiberglass and foam board insulation to properly air seal and insulate a knee wall.
In this case after insulating the stud cavities with fiberglass batts use 1 inch minimum rigid foam insulation to cover the back of the knee wall which will prevent attic air from circulating around and through the insulation.
How to insulate a finished attic.
The sloped roof creates a small space that can hardly be use.
1000 2000 cfm50 reductions are fairly common with this method.
One type of walk in attic door insulation to use is rigid foam insulation board.
The first step is to measure.
Without a little help 2 gable vents on each side of a knee wall attic won t move much air.
1 use an r value map to determine the amount of insulation you need.
The traditional approach is to insulate the kneewall and the attic floor behind the kneewall.
A job we finished last week dropped from 4060 to 2150 cfm50 just with knee wall air sealing we were able to get 8 of one wall that had no top plate.
A better approach is to insulate the roof slope above the attic.
With a finished attic insulation must help keep the attic areas comfortable.
I m in the middle of insulating the knee wall in my cape and i the way it was constructed there is a huge hole in the floor right below part of the knee wall measuring 15 x 24.
Walk in attic door insulation is an important part of your attic insulation.
That means insulating the attic floor only not the walls and having vents in the roof.
You will use this on the attic side of the door.
Insulating this space inside the knee wall improves the energy efficiency of the home and prevents heat transfer from the attic.
It s right above the first floor bathroom and laundry.
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.