Maximum Spans for Joists and Rafters - Southern Pine
Advice guide for determining the maximum span for lumber. What size lumber do you require for your 20 feet wide building? What dimension timber do you need for your header. Live load? Dead load? Deflection? Compression? Shear? And more. Check out the span tables.
Are you a fan of softwoods for construction? Does reading this make you want to get your hammer out?