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I think you are reffering to Tyvek . Tyvek is a membrane used to wrap a house or structure before the final siding is installed. In my opinion its worth it to use it on any house it helps seal out moisture and insulate if only to a slight degree. Anyway just my opinion if I were building a house I would use it.
I am planning to build in SC and want to know if I should have the builder wrap the house with tyvex with the use of osb board?
art
Even though OSB is a resin based water-resistant product, the sheathing is mainly used for shearwall structure and not waterproofing. Most inspections (west coast) require a waterproof membrane over the shearwall joints and corner wraps before siding. nm
its not a code to use it, but it should be, alot of older homes dont have it or they used roofing felt,
as for your question yes, wrap the house it is worth it
It is not necessary,but it does make sense to use on new construction,its easy to install,not costly,and does take some air/moisture penetration(although moisture should not be an issue after the exterior is finished)etc. in stride,where plastic is too much of a vapor barrier,it keeps fumes like radon,etc, inside,Tyvek allows some breathing.
You have the advice of several good people and it apeears that they are all correct in saying yes. Tyvek is just one brand name for this covering. Typar and others are very similar. I don't believe Tyvek claims any insulation rating or moisture sealing but it does stop air. This sheeting keeps wind out yet allows the home to breath. What exterior sheeting will go on top?
For all those who think membrane covering is not needed, both the UBC and IRC require wall exterior flashing in most areas. (IRC R703.8 lists 7 locations that require 'flashing' around openings and wall and roof intersections.) OSB sheathing does not prevent water or moisture penetration. The PO asked about needing to use Tyvek and the answer of not required may mislead by not including that there must be a covering such as Kraft or felt to be installed on exterior transitions. It is easier, cheaper and stronger to install Tyvek wrap than mess with pieces of flashing in individual applications. FWIW, check with the building department that may require a weather barrier in your local jurisdiction. nm
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