Weatherstrip the edges and put a piece of rigid foam board insulation on the back of the door.
How do i insulate my attic stairs.
If you have pull down attic stairs or an attic door these should be sealed in a similar manner.
Begin by checking to see if the attic stairs close tightly then apply self adhesive foam weather stripping around the perimeter where the plywood door meets the frame except on the hinge end.
Pre made insulated attic stair covers are also available from local home improvement centers or on the web.
Add insulation to the exterior of the plywood box.
Once the opening has been sealed it can be further insulated by building a foam box in the attic to enclose the stairs.
Attic pull down stairs can leak air which leads to higher energy bills.
This video shows you how to easily construct an insulated cover.
Install 1 inch or 2 inches depending on how cold your climate is of foam board insulation see foam board insulation r.
How to insulate under stairs install 1 3 wood strapping along the bottom of the stair stringers from the bottom up to the top.
Treat the attic door like a door to the outside.