![]() ![]() ![]() 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).I would not be interested in 1/2, but I might be in the area between 1/3 and 1/2. using the factor.īut, If I wanted to go above 1/3rd, could I use Fibonacci calculations to further reduce the span and be in compliance with the code? If I wanted to place the rafter tie 1/3rd the way up, I would have to find a appropriate span, species, spacing, thickness. We know that using the span adjustment factor reduces the allowable span because you are multiplying the table spans by the decimal factor. But could you? The 0.17 to 0.33 range is a Fibonacci Sequence (3,5,8.) that can be extended to: There are no restrictions that say you cannot place the rafter tie above 1/3. The upper limit shown is 1/3 the way up, above the wall plate. Table 802.5.1 specifies a Rafter Span Adjustment Factor in Note a. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |