Learn more about BCI® Joists and our sizing software BC Calc® or view the US East and US West span and size charts. And, for the lower side on the sill plate, I imagine cutting the bird's mouth is a little tricky with the wider lumber. BCI®Joists are specially constructed I-joists with flanges made from strong VERSA-LAM® laminated veneer lumber with oriented strand board web and approved waterproof structural adhesives, providing outstanding strength and durability. Span of Tributary Load : 20-01 PARTITIONS NO PARTITIONS GIRDER SIZE SPAN BEAM SIZE I ' MAX MAX. The tables below give maximum spans for rafters and beams. For heavy roofs or in areas with substantial snowfall or winds, call your local building department for code requirements. Im wondering if L brackets would be enough. RAFTER SIZE SPACING ALLOWABLE SPAN SPAN Max. In areas with mild climates, patio roofs are generally designed for loads of 30 psf (pounds per square foot). Question Two: Does anyone have experience working with 4圆? Specifically, how would I attach the rafters to ledger board? They are significantly bigger/heaver than a 2圆, and they dont really have hangers that let you angle it. Is there anywhere I can find a table for rafter spans for 4圆? I used a calculator that shows the span works, but I don't think the inspector will approve it unless I can either find something in code, or I get an engineer to seal it. For example, some localities get large amounts of snow, whereas others get none. Before determining the maximum spans for joists and rafters, you must know the load requirements for your region. You should be OK for just about any decent structural timbers. Rafter Span Tables - Use these tables to determine the maximum span of a rafter, given the size, spacing, species, and grade of lumber. I looked up in Charlie Wings 'From the Ground Up' and found a span chart for 37.5 psf load (sleeping room) and rough cut 4圆 48' o/c. and since this is a little different than normal, I need to show some detail for the inspector. You are unlikely to find charts for that - especially for rough cut. I want to use 4圆 rafters 32 OC, so I can use 2圆 T&G roofing (visible from beneath). I am building a shed style roof for a porch, in the planning phase.
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