In this video michael shows how to use spray foam fiberglass and foam board insulation to properly air seal and insulate a knee wall.
Insulating a knee wakk next to an attic.
One type of walk in attic door insulation to use is rigid foam insulation board.
Watch as he shows st.
A better approach is to insulate the roof slope above the attic.
A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling.
Insulating this space inside the knee wall improves the energy efficiency of the home and prevents heat transfer from the attic.
The sloped roof creates a small space that can hardly be use.
There are two things you can do to help create an energy efficient attic door insulate and seal.
The traditional approach is to insulate the kneewall and the attic floor behind the kneewall.
1 use an r value map to determine the amount of insulation you need.
The first step is to measure.
This method can be made to work but the necessary air sealing details are demanding and fussy.
With a finished attic insulation must help keep the attic areas comfortable.
There are two ways to insulate triangular attics behind kneewalls.
1000 2000 cfm50 reductions are fairly common with this method.
You will use this on the attic side of the door.
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.
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.
That means insulating the attic floor only not the walls and having vents in the roof.
Walk in attic door insulation is an important part of your attic insulation.
Without a little help 2 gable vents on each side of a knee wall attic won t move much air.
How to insulate a finished attic.