Q: I’ve heard that engineers give no structural "credit" to gypboard, but I know it greatly stiffens partitions when I nail it up. How much shear strength does drywall really have, and why not credit it in the design?
Q: Does using purlins and struts at midspan allow you to cut the roof span in half compared with what’s given in a rafter table?
Q: Does CCA pressure treatment adversely affect the strength or durability of framing lumber?
Should live and dead roof loads be calculated based on the horizontal run of the roof, or on the actual length of the rafter?
