Originally Posted by Shaggyt
This was the most challenging part of my build. I used rigid foam on the door as well, and lots of weather stripping, several different types too. I then needed several slide bolts to keep door tight to the weather stripping.
Does the "door" really need to be a conventional door? How about a "hatch", with plywood front and back, plus a 2" foam board core? Thick foam rubber weatherstripping on the hatch and the hole it goes into.
The hatch will not be used like a door. It will only be opened at most once a day or so. Should be able to seal it better than a regular door.