SIS or OSB?
My hubby and I are in Western PA (5A) and are in the works of building our home w a local builder. Their standard material is Blue Dow board or SIS. I found it a little curious at first using Styrofoam to hold a house up but hey what do I know about houses. From the inside out it goes: drywal, insulation, 2x4s with some metal reinforcement, then the SIS,some plastic wrap (for lack of better term) then the siding. This gives it a R-19 rating. I inquired later about plywood and they said I could swap the SIS for OSB? However doing so would negate the energy efficiency warranty that is offers for two years w the SIS.
Also it was recommened that if we were to choose the OSB, they recommend upgrading to 2x6 to increase R rating.
We do not know much, so I am.asking for guidance. It's a two story 2200 sq ft house in rural w.PA. It's situated on an open lot with no tree coverage "ontop" of home however the property is surrounded by them on all sides. The family room will have vaulted ceilings peaking at 12ft. In that room on the longest wall there will be a wall of Windows facing south.
I want to add the builder does use OSB in the corners of home
I feel like the SIS would be the better choice to keep the air in (energy efficient) however then the house won't breath. On the flip side the OSB can rot and not dry if the R rating is to high or have thick wall according to an article found on here.
What would be better structurally?
Posted Thu, 09/05/2013 - 21:24
Edited Fri, 09/06/2013 - 03:51
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