SIP vs ICF
I know this is a topic that has been talked about a lot, but I do have a question we are mulling over in designing our house.
I have been pricing materials and it seems that both ICF and SIPS are going to cost relatively the same. (We are doing labor ourselves.) With the ICF we were going to get continuous R value of 24 and no air leaking or thermal bridges. We were going to bring this up to the roof where we would use SIPs that are 6 1/2″ for an R40. We were then going to either dense pack below the sips or add another couple inches on top to try and bring it to around R60.
The other option is to do sip walls that are 6 1/2″ thick and get an R40, but then there will be thermal bridging where the 2nd story floors sit on top of the Panels (rim joists).
What would be better for the same cost? High R value with more chance of thermal bridging or lower R value with no thermal bridging? Is there another way to build (without building an interior wall) to eliminate the thermal bridging with SIPs?