Exterior wall assembly
I am building a THOW (tiny house on wheels) in CZ-3 and have the following plan for the exterior walls:
2×4 steel framing, 16 OC with R-13 in the cavities
#15 Black building paper
1/2″ densglass sheathing board
1″ R-Max sheathing
Combo reclaimed wood and corrugated metal siding
Questions and Concerns:
1. Attaching the two outer layers of sheathing to the framing could create a lot of penetrations into the framing studs. Should I just prop the dens glass onto the framing with a few fasteners and then attach the R-max sheathing with the advised fastener spacing, running through both layers into the framing? (I may have just answered my own question)
2. My siding is a combo of 1/2″reclaimed wood and 1/2″corrugated metal. I had planned on using 1″furring between the hydro-gap and the wood portion but now realize that this will create an uneven surface for attaching the two materials. Do I NEED the furring under the wood portion? The metal is an additional rain-screen by nature. I don’t think I can overdo the importance of as much rain-screen-ability I can get given the small dimensions of the home (moisture issues abound), and being in a high humidity area. Do you believe that the Hydro-gap is sufficient?
I COULD add furring strips to the entire envelope but it may well be overkill. But, tiny home, tiny budget and I have no room for unnecessary expenditure.
I hope this all makes sense.
Waiting anxiously to hear from the experts!! So glad I found this site. Many thanks!!!
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