The above-grade walls were constructed of 6.5-inch-thick structural insulated panels (SIPs). Over the SIP wall panels, Clifton installed corrugated house wrap and fiber cement siding. Clifton used 10.25-inch SIPs for the roof. These provided for an R-40 insulated attic or cathedral ceiling. They also provided a sturdy platform for the photovoltaic panels. Over the SIP roof panels, Clifton laid breathable 30# felt underlayment and then installed architectural-grade composition shingles.
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