![]() Includes APA’s recommendation to increase the fire endurance of all floor-joist assemblies based on the International Building Code. Technical Topics TT-015: Wood I-Joist Floors, Firefighters and FireĪ discussion of the durability and safety of wood I-joist floor assemblies in structure fires. Learn about several options that enhance the fire performance of I-joist floor systems and comply with the International Residential Code (IRC) by visiting the I-Joist Fire Assemblies page. Includes information on span ratings, installation details, cantilever designs, architectural specifications and engineering design properties for APA Performance Rated I-Joists.Īccess a complete list of APA publications about I-joists in APA's Resource Library.įire Protective Assemblies for Wood I-Joist Floors The mark signifies that product quality is subject to verification through APA audit-a procedure designed to assure manufacture in conformance with APA performance standards or the standard shown in the mark. APA PRIs are recognized through ICC-ES ESR-1405.ĪPA trademarks appear only on products manufactured by APA member mills. This Performance Standard provides an easy-to-use table of allowable spans for applications in residential floor construction, allowing designers and builders to select and use I-joists from various member manufacturers using just one set of span tables. Many APA member-manufacturers have software design tools contact the manufacturer (at right) for more information.ĪPA Performance Rated I-joists (PRIs) are manufactured in accordance with APA PRI-400, Performance Standard for Residential I-joists. I-joists are popular for floor and roof framing. Flange widths vary from 1-1/2" to 3-1/2" long lengths are readily available. In addition, wood I-joists are typically stocked and readily available in depths that meet the needs of residential framing.ĩ-1/2", 11-7/8", 14", 16". Because I-joists are straight and true, it's easier for builders to avoid crowning and maintain a level framing surface. They are ideal for long spans, including continuous spans over intermediate supports. I-joists are used extensively in residential floor and roof framing. The robust combination of structural characteristics results in a versatile, economical framing member that is easy to install in residential and light commercial projects. The flange material is typically laminated veneer lumber (LVL) or solid sawn lumber, and the web is made with plywood or OSB. I-joists are comprised of top and bottom flanges, which resist bending, united with webs, which provide outstanding shear resistance. I-joists are strong, lightweight, "I" shaped engineered wood structural members that meet demanding performance standards. USDA Forest Service Forest Products Laboratory.Engineered Wood Technology Association (EWTA).On the other hand if I look at LVL's 140X45 seems to be the equivalent so am I better heading down that path as it looks like it could be cheaper due to less timber required. So I just wanted to check is it normal that no matter what sized F17 hardwood I choose it will need to be two lengths nail laminated together? I'm sure I had older span tables that showed single bearers e.g. (and may need to go bigger if I can't find 120X35 easily) FLW of 2400, RLW 4500, with tiled roof and cont. I've since bought the Seasoned Hardwood F17 Span table supplement and they appear to suggest that no matter what span or size of timber they will need to be two lengths nail laminated. I did a rough budget based on F17 and some span tables I found. I was originally going to use F17 Seasoned hardwood, or some form of LVL (Red Alert maybe). In the meantime I'm trying to work out what to use for the bearers and joists. Plans have been drawn up by draftsperson, owner builder course done, just waiting on some engineering drawings for garage that I'm getting included at the same time before submitting to certifiers. I'm about to start building an extension on to the back of our house.
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