Dow SIS in zone 5
MJDesigns
| Posted in Energy Efficiency and Durability on
Take a look at the photos attached. One of the local builders is just using Dow SIS R3 as well as Dow XPS R3 outside of 2×4 construction … no OSB at all. I asked how he’ll insulate to which he replied R13 fiberglass batts. Climate zone 5 which should have R5 outside of the studs to minimize the effect of thermal bridging and condensation … correct? Is there a fundamental problem with this strategy? Is it really any better than what the other builders are doing with just OSB on the exterior? Seems like it still falls short in zone 5.
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Clearly your friend does not know the code. CZ5 requires R20 or R13+5 (R5 is continuous insulated sheathing). He needs to read tables 2009IRC N1102.1 or 2009IECC 402.1.1. R20 cavity insulation only allows for higher risk of wall condensation.
SIS panels are structural insulated panels and can replace OSB or Plywood, however they are going to discontinue its production en the next month or two.
A knowledgeable building inspector, Energy Star verifier, or good law suit will fix his risk management techniques.
Armando, building codes are adapted locally and for instance here in NY we adapt sometime after the release of new ICC code. Some areas have NO code.
Location is zone 5 in Central OH ... suburb of Columbus
Milan doesn't say where is from, however, as I searched NY, "The 2010 version of the Energy Conservation Construction Code of New York State (ECCCNYS) was effective on December 28, 2010. All projects permitted after that date are required to comply with the 2010 ECCCNYS." The 2010 ECCCNYS is based on the 2009IECC,
See: http://www.dos.ny.gov/dcea/energycode_code.html
Milan, Ohio is on the 2011 OBC and 2006 IECC, so your builder friend is NOT in compliance, CZ5 has R19 or R13+5 (prescriptive Code). (I had to search 2006 IECC) I have not use the 2006 IECC code in years, don't even own one now...
But you know? The builder could be using the performance path, having a rater doing verifications and testing, and that way he could comply with the code.
Armando, your last post was your best. And yes, I do know my NYS code. Best change NY made to code us allowing 8 1/4" rise on the beautiful custom stairs I leave my customers with.
Like I said, 2009 code, and it is June, 2012 as we chat Armando. ;)
Thanks for the feedback ... lots to learn by our builders in central OH.