We are cutting and fitting the polyiso left over from the wiring chase around the door areas to use up smaller pieces.
By using the polyiso so sparingly we can keep more of it tacked up as temporary bathroom walls.
Another large area that needed polyiso insulation to seal it was the opening to the attic for wiring. I had to spray foam into the wiring holes and a bit into a crack between the attic and the entry area to the wiring chase first. Then I cut a piece of 1″ foil covered polyiso to fit the opening. I used some leftover telephone wire to hold the foam against the opening and stapled it to the 2 x 4’s.
I had to cut a hole for the vacuum piping and then seal it all with spray foam. The spray foam was a bit awkward and the job was rather messy. I got spray foam all over my hands and some on my arms! But I have some cleaner that helped remove most of the stray foam from my body. I’ll have to trim extra stuff on the wall with a razor knife.
If we have enough 1 1/2″ polyiso I may fit a piece between the 2 x 4’s in front of the foil covered piece. After the polyiso is finished we can move on to installing the Siga membrane.