The last couple weeks have been fits and starts. Basically finishing up the exterior insulation and installing the strapping.
Finishing the foam was a laborious process. All the seams of the foam had to be taped. If I couldn’t tape them for some reason, I had to fill the gaps with spray foam. This was important to make sure there were no air leaks (or at least as few as possible).
At the top and bottom of the walls I had to put insect screening. Once the siding is on, there is a continuous air space between the siding and the foil-faced foam. The concept is called a “ventilated rainscreen“. The siding can be a little leaky; any moisture that gets behind will run down the foam and out of the wall, or evaporate. This improves the durability of the building by reducing water intrusion and extending the life of the siding and, in the case of the wood parts, its paint or stain.
The air gap also allows the reflective foil facing to serve as a radiant barrier. This is pretty important in a hot climate like ours. It reflects a lot of solar energy away from the building in the summer time.