![]() ![]() I have passed this on to the homeowner to sort out the details. Try to get in touch with Scott Levengood - he is a wood extension agent for OSU. TECHNICAL WOODEN PRODUCTS (EWP) LVL SPAN AND SIZE CHARTS. (the tables permit a bearing length of up to 3.5 inches, but since 1.5 is probably the worst case that you’ll encounter for joist or rafter bearing, it’s a safe value. Never try to buck the code to please the owner - it can be very expensive, I know. Table 9.1 in Span Tables for Joists and Rafters (Figure 5) gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1.5 inches. Verify adequacy of beam in uniform load tables prior to using values listed below. Better to smile and say yes sir and follow the code. It isn't fun to tear something out and replace. From past experience, never use anything that doesn't have a grade stamp or has been approved by an engineer. Sounds like he's being (overly) cautious to me (or covering his butt) - the span and loading are such small values.īeing a builder in Oregon, I can say they (building inspectors) are very strict. "I need a table of comparison for the building inspector." Building code manuals (are you under the IRC code?) have tables for header sizes, and the strength characteristics for the clear species you mention would seem to exceed those of standard SPF lumber typically considered for code span tables. In my experience, using gluelams for a 5 foot span in a single story residential structure would be like using a 50 caliber rifle to shoot a squirrel. "The span needed is only about 5 feet and the load is for a bearing wall on a single story home." A beam is usually not considered riftsawn. And yes, I work at OSU, I just don't know who to ask.Ĭall the head of the OSU Forest Products Lab. Any help you can provide would be appreciated. I need a table of comparison for the building inspector. The span needed is only about 5 feet and the load is for a bearing wall on a single story home. VERSA-LAM ® cover veneer lumber (LVL) beams or headers eliminate twisting, shrinking and split, and deliver flatter, calmer floors both structures. The solid wood beams would be clear rift sawn lumber dried to 9% MC (no defects). ENGINEERED WOOD PRODUCTS (EWP) LVL SPAN AND SIZE CHARTS. For an equal size, it would not surprise me to see gluelam with spans 50% to 200% more. t Tables are based on uniform loads and the most res rictv eofsmpl continuous spans and dry-use conditions. The real issue is, what is the grade of the solid oak and maple beams? With gluelam we can control the quality of the laminations and therefore the overall strength and stiffness within a narrow range. Are there any tables that compare the load bearing and span characteristics of fir glue laminated beams with solid hardwood beams? I am specifically interested in comparing solid Oregon white oak and bigleaf maple beams to commercially available fir glue laminated beams.įrom Professor Gene Wengert, forum technical advisor:Īre you in Oregon? If so, you have some excellent Forest Products Extension people there and also a wonderful Forest Products Lab at OSU. ![]()
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