Is there any way to flatten 1/2 in OSB sheathing that has warped due to getting wet? My contractor left the sheathing without house wrap on for several weeks and consequently, all the sheathing is bowing out between the furring strips. The renovation included adding exterior insulation to the house so the contractor added 2×4 members every 24 inches to minimize thermal bridging. Each bow is perfectly centered at that 24-inch spacing. Any help would be much appreciated as the contractor has asked me how to fix it, not a great sign I know.
Jon Beer discusses air-sealing and insulation strategies at FHB House New York.
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