Cut 1 3 boards to fit the perimeter of the opening and nail them on with 6d finish nails.
Attic access door seal.
Install a gasket around attic access openings to air seal between the opening and the panel covering.
While there are a variety of ways to seal and insulate an attic hatch the most effective method is through the installation of an approved attic access cover such as attic gator by yellowblue.
Sometimes referred to as a scuttle hole cover attic access covers are products specifically designed to solve the insulation and sealing problems associated with attic hatches.
The stops provide a wider surface for attaching the weatherstrip and a space to mount hook and eye fasteners.
Insulate the cover with rigid foam that is glued in place or batt insulation that is mechanically fastened e g with wires and screws.
If your hatch rests directly on the moldings add 2 1 2 inch wide stops around the opening.
Attic door insulation cover attic tent attic ladder insulation cover attic tent insulation cover attic stairs insulation cover with easy zipper access 25 x 54 x 11 4 6 out of 5 stars 97 43 90 43.
Air seal attic access panels and drop down stairs to minimize air leakage.
Apply self adhesive foam weatherstrip tape to the top edge of the stop.
Rease scuttle hole covers and pull down attic stairs loosely fit into the attic access hole they are covering.
Sealing the attic hatch or door finish up by sealing the access hatch with self sticking weather stripping.