He'd like his pergola beam span to be 18 ft, excluding rafter tail ends, so the beam span needed to be shortened considerably. Reading off the “Empty Under” table, with h = 5m, hc = 2.5m, span table C will be used to determine the spans. Simplified span tables for Southern Pine lumber and glued laminated timber (glulam) headers, beams and girders. The tables below give maximum spans for rafters and beams. Extreme Fiber Stress in Bending - Fb (Fig. The pergola is going to be 10' high, as he is a tall chap, so, at the six posts, a sizeable corner brace can be installed without the risk of banged heads. View Size Selection Tables. View Allowable Load Tables. Standard Pergola Rafter Spacing. The figures are based on quality materials. From span table C, the maximum allowable single span … also available for the Android OS. Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. Step 4 Assume the wind classification for the area is N1 and the roofing profile is Stramit® Corrugated cladding 0.48mm BMT thickness, in a single span configuration. There are two standard rafter spacings, and not coincidentally, they’re the exact same as the joist spacing used beneath floors. 1) When … Keep in mind that these are … You can also use the Wood Beam Calculator from the American Wood Council … These span tables are calculated based on MOE and Fb values. For lesser grades, spans should be shorter. The measurements are 12 inches and 16 … Span Calculator for Wood Joists and Rafters also available for the Android OS. Let's take a look at how to cut down the span … Disclaimer: These easy-to-use tables … In addition Fc and Fv are included as a consideration for selec-tion of joist and rafters.