Carefully pull down the finish trim.
How to seal attic access panel.
Use spray foam to air seal these openings if they exist.
Install weather stripping along the top of this ledge.
How to air seal attic access panels.
Pray that the installer used finish nails and not say ring shank nails.
Install wood trim pieces on the ceiling side of attic access hole framing.
Apply self adhesive foam weatherstrip tape to the top edge of the stop.
If your hatch rests directly on the moldings add 2 1 2 inch wide stops around the opening.
Cut 1 3 boards to fit the perimeter of the opening and nail them on with 6d finish nails.
How to insulate and air seal an attic access hatch.
Air seal the trim the first step is air sealing the finish trim and enclosure around the attic hatch.
The access panel will rest on this trim.
The trim should extend one half inch to one inch around the inside edge of the access hole forming a ledge.
From inside the attic check for any openings holes or fenestrations into the knee wall surrounding area.
Sealing the attic hatch or door finish up by sealing the access hatch with self sticking weather stripping.
Once you have the materials you can begin to seal and insulate the knee wall access door through these steps.