How important is allowing for the 1/8 inch space with 4 x 9 x 1/2 material when sheathing an exterior wall?
Larry, Portland Oregon
Panel spacing is absolutely essential. Your OSB wall sheathing will expand or contract as it adjusts to the ambient conditions of your climate zone. Insufficient spacing between the panels can result in buckling and expensive call-backs.
Using 10d nails as a spacer will help provide the required spacing and speed up your installation process. Consult the manufacturer’s instructions as well as those set out by your design professional when installing OSB wall sheathing.