REMOTE with SIPs??
Apologies if this has been asked before, but as far as I caould see it had not.
I am planning a Passivhaus self-build in a cold, wet, maritime type climate (Scottish Island), probably an equivalent ASHRAE climate zone 5C. It is a windy wet area, so dry building season is short, and I am planning to do much of the work myself (I am an HVAC engineer, limited building experience). So with this building experience in mind I am trying to use “dumb” technologies where I can, a balance of cost and build speed.
I was initially attracted by SIPs for it’s fast erection time, and buildability. I can get it made-up to my specs, delivered to site, and have it up fairly quickly. I really like Jo Lstiburek’s perfect wall, and CCHRC’s whole REMOTE wall assembly ideas. However I would like to know if you could marry the two technologies, SIPs and REMOTE together??
An inner 1/3 SIPs super-structure, wrapped in a breathable membrane, and then a complete rockwool exterior insulation to make up the R-value to Passiv standards. My WUFI calcs suggest this assembly would work well. The vapour drive is nearly always outwards here, and with the driving rain as well I really want an assembly that can breathe, and dry itself.
The added advice from Ecohome.net (https://www.youtube.com/watch?v=Z-yasiKVRms&ab_channel=TheEcoHomeNetwork%3AGreenBuildingResources) for reducing thermal bridging from insulation fixings by using a split set of furring strips looked sensible. My biggest issue with this proposed assembly is attaching all this rockwool (~6″), and wood siding, back to 15mm (about 9/16″) OSB SIP sheating. My alternative idea might be to use Larsen trusses outside the SIPs, thereby transferring loads a bit better, but it’s just more cost right.
I would love to hear anyones advice, experience, or alternatives for this wall assembly.
Thank you for your time, and any replies would be greatly appreciated.
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