Assemble the sides of the box with metallic duct tape.
How to insulate attic stairs.
Once the drywall is installed you can fill the gap with spray foam.
Then take your self adhesive foam weather stripping and apply it all around the perimeter of where the frame and the door meet.
More insulation 6 inches or 8 inches isn t uncommon.
Add insulation to the exterior of the plywood box.
Position the box over the stair opening in the attic.
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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.
If the flange of your zippered attic cover sits on top of insulation there is no way to caulk it in place.
That means that you should glue at least 4 inches of foil faced polyisocyanurate r 26 to the box.
To insulate fold down attic stairs.
Once the opening has been sealed it can be further insulated by building a foam box in the attic to enclose the stairs.
The stairs themselves also need to be insulated and the bottom of the stringers should be air sealed with airtight drywall.
Apply weather stripping first check that your folding attic stairs are able to close securely and tightly.
If you have pull down attic stairs or an attic door these should be sealed in a similar manner.
With attic insulation we aim for a pretty high standard usually at least r 49 and the coffin insulation should match.
Cut sides and top from sheets of 3 4 foam board with a utility knife.
One way is to install 2 4 blocking behind the stringers.
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.
Caulking around the flange helps to further insulate the stairs by preventing air from escaping into the attic.
Measure the size and height of the stairs from the attic.