If your hatch rests directly on the moldings add 2 1 2 inch wide stops around the opening.
Air seal attic hatch.
In addition attic hatches are often constructed from thin wood or drywall which does not prevent heat loss.
This can also be beefed up to a sealing gasket like the one on your refrigerator door.
Pray that the installer used finish nails and not say ring shank nails.
Air sealing the hatch the plywood hatch rests on a small wood strip lip.
Gaskets are generally more durable and produce a tighter seal.
Sealing the attic hatch or door finish up by sealing the access hatch with self sticking weather stripping.
The standard air sealing recommendation is installing a compression bulb weatherstrip.
Weatherstrip the attic access hatch or door.
Apply self adhesive foam weatherstrip tape to the top edge of the stop.
Cut 1 3 boards to fit the perimeter of the opening and nail them on with 6d finish nails.
Carefully pull down the finish trim.
Air seal the trim the first step is air sealing the finish trim and enclosure around the attic hatch.