I’m residing my colonial, leaning strongly to fiber cement siding. House was built in the 1970s, last winter was very cold (Minnesota), so I figured I’d take the opportunity to ad maybe 1″ of EPS over the “buildright” sheathing before I put on the new siding. Before I tear into it I wanted to run it by the FHB braintrust.
I was planning on using housewrap which would go over the buildright “sheathing” then, according to a recent FHB on foam panels, the EPS would go over the housewrap, then nail the siding to that.
First question: is this the right ordering of materials (EPS is not a vapor barrier so it would seem ok).
2nd question: should I use furring strips over the studs to obtain better nailing for the siding. This seems like it would create a thermal bridge and negate some of the value of the EPS. If not furring strips then my guess is that I would need something north of 3″ nails for the siding.
3rd Question: any thoughts about ripping off the buildright, remove whatever fiberglass insulation is in there (it does exist atleast I see it when I tear into the walls) spray in DIY foam, reside with OSB/housewrap and then side?
