more insulating when doing repairs
There are often funny places in a house which are not insulated or air sealed. Plenums. Or my stair way landing, which is like a Plenum, but up from the floor....I had to replace some siding, so that became an opportunity to access that otherwise enclosed space.
The pink insulation is the new stuff.
The stairway landing is in a corner, the 2 outerwalls under the landing had no interior drywall or insulation on those parts of the outside wall. This can be alright if the builder decides that the area is "unheated space" like an attic, and puts an air barrier and insulation on the little interior stub walls and under the landing floor. But, that wasnt the case. This happens alot with plenums, little dropped ceiling areas too, there may be no barrier established.
It is very tight to try to get into such a tight space on teh inside, so siding replacement which had to happen in that area gave an opportunity to access the space.
First, my friend crawled in from the outside where the opening was large enough, and insulated the other outside wall area, and then put on a piece of drywall, and caulked all the edges of the drywall. I painted the drywall from teh outside with a small roller brigh and an extension handle. The we put pieces of 2x4 blocking in each stud bay in the open wall, and cut a piece of drywall for each bay. I painted these. We screwed them in, painted side facing to the inside of the house. Then they were caulked. Then the insulation was set in from the outside, like you see in the photo, paper side in.