Add fiberglass or rigid foam.
How to insulate attic door cover.
The simplest fix is to attach insulation to the top of the cover and weather stripping underneath where it rests on the lip of the opening.
There are different ways to accomplish this.
Then add insulation batting to form a pillow and wrap it up like a birthday present as shown.
Measure the cover to make sure it fits the opening with the cover overlapping the molding lip so the weather stripping seals well.
Add foam insulation tape around the edges to seal the perimeter where it rests in the access hole.
You can check for air leaks with a lit incense stick or a thin.
Once you have the materials you can begin to seal and insulate the knee wall access door through these steps.
Cut out two pieces of rigid foam board that are 1 4 inch smaller than the hatch so homeowners can slide the attic access panel open easily.
Cut a piece of 3 8 inch or 3 4 inch plywood about 1 4 inch smaller in width and length than the dimensions of the opening.
Inspect the weatherstripping gaskets around the attic hatch opening.
Staple long pieces of duct tape sticky side up onto the attic scuttle door.
Trim four pieces of 1 by 2 lumber with a circular saw to.
First install foam weather stripping on the inside of the trim or directly onto the hatch.
Here s one good method.
From inside the attic check for any openings holes or fenestrations into the knee wall surrounding area.
Apply weather stripping to the door to create a seal.