I am having a contractor build a new home for me. This home will be built in NorthEastern US (Pennsylvania). The builder normally constructs exterior walls with 2x4's, insulation, and Dow "Blueboard" sheathing. Only the corners/ends of any walls have OSB. The builder says they can do OSB covered with "blueboard" on all exterior walls but there is a cost increase for this. The builder says that they build all of their homes this way and that they see no clear benefit in doing OSB on all walls. I have asked some other local contractors and have gotten mixed results.
Is it worth the added expense to have OSB done on all exterior walls???
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