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.
How to close door for attic.
Measure 1 inch in from the corners of the attic hatch on the frame on the opposite side where the hinges have been mounted.
If you have pull down attic stairs or an attic door these should be sealed in a similar manner.
If they are loose tighten them up as much as possible using either a wrench or screwdriver depending on your attic ladder model s attachment type.
Weatherstrip the edges and put a piece of rigid foam board insulation on the back of the 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.
Weatherstrip the attic access hatch or door.