The advantage here is that your knee wall is probably already insulated this way so it s just a matter of buying some foam so cheap.
Sealing wall in attic.
Air sealing the attic perimeter.
If your hatch rests directly on the moldings like ours did add 2 1 2 in wide stops around the.
Install drywall then seal the seam from the attic side with caulk foam or drywall adhesive but not other construction adhesives.
And having thermo pane windows are worthless if air is leaking around the sill.
Insulating and air sealing knee walls unvented version.
The disadvantage is that it would be very very hard to reach the desired r value from r 49 to r 60 depending on climate for attic insulation.
Air sealing the wall plate around the perimeter of your attic blocks air from escaping around the outer edges of your home.
Before installing drywall install caulk or other sealant or a foam gasket to the face of the top plate then install the.
To properly seal your attic hatch also known as an attic door or scuttle hole at a minimum you should apply weather stripping and ensure the attic side of the attic door is insulated.
Then finish up by sealing the access hatch with self sticking foam weatherstrip photos 10 and 11.
So it is important to seal the window frame to the.
Air seal drywall to top plates at all attic wall interfaces to minimize air leakage.
But the biggest killer for heat loss is infiltration rate.
When you re done sealing your attic bypasses push the insulation back into place with an old broom handle or stick as you back out of the attic.
Not the r factor of the walls and celling.
Heat is vertically polarized so insulation in the attic should be at least twice as much as in the walls.