This can also be beefed up to a sealing gasket like the one on your refrigerator door.
How to seal a attic hatch.
Seal trim to ceiling.
Create air tight seal between hatch and trim.
Treat the attic door like a door to the outside.
Apply weather stripping to the door to create a seal.
When the sash locks are rotated in use they form an air tight seal with the foam weatherstripping.
To guarantee a good seal i paired sash locks with a gasket of foam weather stripping around the frame of the attic hatch.
The standard air sealing recommendation is to install a compression bulb weatherstrip.
Plug open stud cavities.
Pre made insulated attic stair covers are also available from local home improvement centers or on the web.
Wrap insulation in plastic.
Air seal the hatch perimeter the plywood hatch rests on a small wood strip lip.
There are two issues that need to be addressed with the attic hatch.
My apologies for the lack of photos but you can surely imagine how it works.
Fortunately you can easily air seal and insulate your attic hatch saving you energy and money.
Apply a bead of caulk on the inside and outside edges of the trim and then reattach it.
Weatherstrip the edges and put a piece of rigid foam board insulation on the back of the door.
Once you have the materials you can begin to seal and insulate the knee wall access door through these steps.
Plug the big holes first.
From inside the attic check for any openings holes or fenestrations into the knee wall surrounding area.
Cut a piece of fiberglass or rigid foam board insulation the same size as the attic hatch and nail or glue it to the back of the hatch.
Air sealing involves two steps.