The stops provide a wider surface for attaching the weatherstrip and a space to mount hook and eye fasteners.
Air sealing details for attic hatch.
Seal the attic access.
Sealing the attic hatch or door finish up by sealing the access hatch with self sticking weather stripping.
Apply self adhesive foam weatherstrip tape to the top edge of the stop.
Air seal the hatch perimeter the plywood hatch rests on a small wood strip lip.
Cut 1 3 boards to fit the perimeter of the opening and nail them on with 6d finish nails.
Weatherstrip the attic access hatch or door.
If your hatch rests directly on the moldings add 2 1 2 inch wide stops around the opening.
This can also be beefed up to a sealing gasket like the one on your refrigerator door.
Instead of crunching the numbers as he did one just needs to walk by one in a hallway during the middle of summer to know it isn t insulated.