The weather has not been cooperating, and we've had a few setbacks. It seems to be taking forever to get the roof finished! Today we put on the third layer of rigid on the roof, and started the rigid on the walls. The goal was to have at least the top part of the walls down, so that I can spray foam any gap between the roof and wall insulation, in preparation for the final layer of roof sheathing that will be the nailing surface for the shingles.
Action shot!
Cutting the right angle.
Adding low expansion spray foam to the gap between the wall and roof insulation.
What was that about low expansion? Ugh. As the foam expanded it pushed the wall insulation out, creating a bit of a curve at the top of the wall. (And, I can only assume, an air gap between the insulation and the wall sheathing. Not good.)
I had minimal strapping on the walls, just enough to hold the insulation in place. In future I would recommend having vertical strapping that extends up the wall to the roof, and if possible, attaches to the ends of the roof strapping. Anything to keep the rigid insulation from bending from the pressure of the spray foam.
The purpose of the flashing and insect screening is to keep critters out of my insulation and out of the air space behind the sheathing. Here's a detail of how I added insect screening to the bottom of my wall insulation. First I nailed flashing to the wall, then taped the insect screening to the top of the flashing, allowing the excess to hang down while the rigid is installed...
When I'm ready to put the strapping on I will fold the insect screening up... what this photo doesn't show is that it will be folded over the strapping. (The strapping will be between the rigid insulation and the screening) This will create a barrier so no critters can get into the wall, while still allowing rain to drain and air to flow behind the siding.
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