Q: I recently inspected a home that had 3/8-inch OSB corner bracing. The surface stamp indicated that the strength axis of the panel ran in the long direction (see photo, below). I assume this means the panel should be applied with the long dimension across the studs, yet the builder had installed the long dimension parallel to studs. I called APA to check and was told the stamp only applies for roof sheathing and not to corner bracing. Why is the strength axis important for roof sheathing but not for corner bracing?
Do you have to double 2x12 trimmer rafters when installing a skylight? Can you remove collar ties in an attic? Just how strong is a toe-nail? We asked four engineers to answer these and other structural questions.