And even though span tables provide limited data, they are very long. as the earlier poster said the modern products are engineered to be stronger, straighter and have far greater spans.Īlso with modern waterproofing the bathroom will outlast our own lifespan.īut as alex said, if you can afford it, go with bondeck. Most beam tables only list values for whole-foot spans like 11’0, 12’0, etc. You wont have any water issues with LVL's or I joists for that fact. Sounds like F graded solid timber (as joist) is becoming obsolete because it is an overall inferior product? I am just trying to determine the best material to use. It also includes design examples, span tables, fire ratings and warranty information. I was thinking about water resistance under the bathroom. West Fraser LVL Users Guide is a comprehensive pdf document that covers the specifications, applications, installation and handling of West Frasers laminated veneer lumber products. in writing 6-when global lvl beams are used as floor joists, they shall be designed to meet recommended deflection and vibration criteria 7-unless otherwise indicated, tables are based on 'true' modulus of elasticity e 1. veneer based joists like I joists and LVLs average out these variations. 5-do not drill, notch, cut or alter global lvl except as approved by lvl global inc. ![]() ![]() Step 3 Wood Design Values: Now you must select a wood species and grade that meets the required Fb and E values, and that’s available in your area. Then find the required Fb value at the bottom of the column. Definitely I joists, dead straight and stable.į graded Solid timber has strength variation between sticks so difficult to ensure they won’t deflect. Given a design span of 15 feet 1 inch and a 16 inch joist spacing, first determine which size lumber will work.
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