Critique this approach to insulating and heating, please
I was hoping to get some input on the attached plans, with regard to the building envelope and best approach to heating/cooling.I am building in Morris County, NJ. zone 5a
I like the philosophy of building the tightest envelope and keeping the heating/cooling loads low.I plan on doing a blower door test after framing and before the window/door sheathing is removed for maximum tightness.
Initially I thought of Insulating with 2″ of rigid board on the exterior of the sheathing, from the footings on up, and bat in the cavities (2×6) framing. I spec’d the house out at either 16 or 24″ o.c. 2×6 framing. My thought was the board and 24″ spacing would provide a thermal break and cut down on thermal bridging allowing the bats to bring up the R value.
The question is, From a performance/cost perspective: Should I just go with spray foam? What about just under the roof?
I would be sub-contracting the spray foam out to a separate installer, but would be running the rigid board install myself.
For heating I’m leaning toward a two zone heat pump with furnace back up (gas is available in the street). Admittedly the plethora of options and numerous opinions of have left me confused as to the best way to go.
One more thing: the attached plans went thru one more round of revisions, mostly for exterior aesthetics (although you may catch a ceiling insulation of R30 instead of R38). Also The foundation is being poured not blocked, with 9′ ceilings. Walk out still remains.
Looking forward to you input
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