What size rafters do I need for a 16-foot span? For a 16-foot span, using 2×8 or 2×10 rafters is common, but the specific size would depend on factors like the roof pitch and load conditions. You’ll typically need to use a span/rafter sizing table or an online calculator that takes these factors into account.
How do you calculate rafter size? Rafter size is determined by factors like span, roof pitch, snow load, and the type of wood used.
