I joist sizes represented by its depth and width. In addition, wood I-joists are typically stocked and readily available in depths that meet the needs of residential framing. Because I-joist is 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-joist is 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 (oriented strand board). I-joist are comprised of top and bottom flanges, which resist bending, united with webs, which provide outstanding shear resistance. I-joist is strong, lightweight, “I” shaped engineered wood structural members that meet demanding performance standards. Joists are technically beams that typically spans relatively short distances compared to beams and are made of wood, steel, or engineered wood or lumber. It is like the skeleton/ framing of a building that supports the load which the floor is built to bear. They transfer the dead load of the subfloor and floor finishes and live load of people, furniture and furnishings to beams, walls, headers, or foundation walls. I joists usually run between walls or rafters to support a ceiling or floor. Their function is similar as beams, except floor joists are supported by wall, foundations, or beams framing. Commonly it has a small cross section as compared to beam. Generally it is used in long span structure take the load from slab, then transfer to beam, beam transfer this load to column and then finally column transfer this load to foundation and foundation safely distribute the load in soil. It is typically a horizontal structural member that runs across an open space of building on supporting wall or studs. I joists can be define as several small beams. Depths can range from 9.25 to 24 inches (235 to 610 mm) and reach up to 80 feet (24 m) in length, although 40 to 42 feet (12 to 13 m) is more common. I joist sizes vary according to the I-joist’s intended load and span. The web is typically made from plywood, laminated veneer lumber, or oriented strand board. It is grooved on one side to receive the web. The flange of i joist can be made from laminated veneer lumber or solid wood finger-jointed together for ultimate strength. The web is sandwiched between a top and bottom flange, creating the “I” shape, that’s why its name i joist. Depth of i joist describe by height of the vertical member that is web and their width equal as width of horizontal member that is flange. I-joists were designed to help eliminate typical problems that come with using solid lumber as joists.Īn I-joist has containing two main parts, the web and flange. On approximately 50% of all wood light framed floors used I-joists. The main notable difference from traditional dimensional lumber is that the I-joist made of engineering wood carries heavy loads with less lumber than a dimensional solid wood joist.
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