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.
How to insulate attic door cover.
First install foam weather stripping on the inside of the trim or directly onto the hatch.
Measure the opening for the attic access hole which is often referred to as a scuttle hole.
Add foam insulation tape around the edges to seal the perimeter where it rests in the access hole.
Measure the cover to make sure it fits the opening with the cover overlapping the molding lip so the weather stripping seals well.
Inspect the weatherstripping gaskets around the attic hatch opening.
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.
To insulate an attic hatch you need weather stripping rigid foam board and fiberglass batt insulation.
There are different ways to accomplish this.
Trim four pieces of 1 by 2 lumber with a circular saw to.
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.
Once you have the materials you can begin to seal and insulate the knee wall access door through these steps.
Check for air leaks and wood stops.
Here s one good method.
From inside the attic check for any openings holes or fenestrations into the knee wall surrounding area.
You can check for air leaks with a lit incense stick or a thin.
Staple long pieces of duct tape sticky side up onto the attic scuttle door.