PERSIST vs REMOTE vs SIP ?
We are building a new house in MN (6b), considering various wall systems, and trying to get a handle on the pros and cons of each. Thus far we have:
– Better known construction method, easier to find carpenters, …
– Well documented construction details
– Seems like it would be easier construction than SIP.
– Easier to get all details correct.
– Provides significant interior space in attic for ducting, extra room, storage areas, etc.
– Chemical elements (foam, osb, etc) on outside of air/vapor barrier
– Most of the benefit of PERSIST for considerable less cost?
– Uses standard and known roof construction techniques
– Well documented construction details from CCHRC
– Chemical elements (foam, osb) inside the air/vapor barrier.
– OSB (ply possibly available from ??).
– Relies on adhesion for structural integrity and longevity while PERSIST & REMOTE rely on a standard 2×4 mechanical fastened structure and mechanical fasteners for skin to structure.
– Will there be sagging problems with exterior skin since skin & foam are effectively cantilevered out over block wall? Will mechanical fasteners hold up for 100+ years?
– Any problems with long screws that go through all foam layers causing any condensation (??) problems? Seems they could xmit cold (and moisture?) to sheathing & stud. Or is there enough distance and protection that cold from outside and moisture from inside never interact?
– Uninsulated 2nd floor ceiling allows heated air to rise to attic and is thus wasted (vs having insulation between ceiling and attic space)?
– No known construction details similar to REMOTE.
– More difficult to get wall/roof seal done properly?
– Allows thermal bridging at wall/roof junction
– Requires additional framing to provide interior space for overhead ducting?