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SIPS vs conventional roof construction?

weekendwarriorben's picture

I am designing a home in the Fort Collins, Co area that will have about 4000sf of mono plane 3/12 shed roofs. The geometry is quite simple, with an eye on cost. For about half the area the ceilings would follow the roof plane; the rest could be trussed with mono trusses for flat ceilings and attic space above.

I am trying to decide between SIPS (12", for R-49) and conventional construction, which would consist of a combination of trusses and stick frame. The latter would of course need to include roof sheathing, insulation, venting (unless I used closed cell spray in), more beams, blocking etc. I realize the SIPS will probably give me a tighter envelope, but aside from that, how would the costs compare? The SIPS come to about $10 per sqft plus installation.

The last SIPs i priced were (post #215632, reply #1 of 1)

The last SIPs i priced were about 25% more than conventional construction but that did not include insulation. I think for the time and money savings SIps would be well worth the money.  If you could have the Sips constructed using Zip sheathing you'd be way ahead.

Florida Licensed Building Contractor, 50 years experience in commercial remodeling, new homes, home remodeling and repairs and all types building maintenance.