![]() ![]() Money can also be saved because the total depth of the floor is reduced. Simplifying the HVAC and electrical subcontractor work will save both time and money on the overall project cost. CTJs can be customized at no added cost to locate large web holes where needed so that few, if any, additional bends in duct runs need to be introduced. This allows for piping, ducts, and electrical to be incorporated into the plenum. Mechanical, electrical, and plumbing easily fit between and through joists, increasing ceiling heights.įox explains, “By default, iSpan’s CTJs come with large web holes at four feet on center that, when installed according to the provided framing plans, line up from joists to joist. Speedfloor, Metwood, and iSpan use light-gauge steel with pre-formed openings for mechanicals. Scott Short, Midwest sales manager for Nucor/Vulcraft, says, “Our joists are typically four feet on center, so they can run enormous trunk lines between the joist, with smaller ducts running through the joists, depending on the depth of the web.”ĮcoSpan and Hambro use an open web joist. ![]() With steel joists, plumbing, electrical and HVAC can be routed between and through the joists. With other floor types, such as precast concrete and EPS decking, all the mechanical work has to be run in a plenum under the floor deck. As an additional benefit, no additional shoring is usually required while placingĪnother major advantage of metal joist systems is that they greatly simplify the installation of mechanical systems. Mike Callahan, owner of Metwood, says his company’s joists can be placed up to eight feet apart, and still be strong enough to park cars on. Sometimes spaced more widely in residential settings. Joists are typically placed four feet on center, but are Online tables for Hambro and EcoSpan indicate a joist with a depth of ten inches can span 25 feet, while 18-inch joists can stretch up to 45 feet without intermediate supports. I didn’t want a column or post every 10 or 12 feet.”ĭouglas Fox, PE, the engineering manager at iSpan Systems, states, “Typically, spans of up to 30 feet can be easily and economically achieved, and spans of up to 36 feet are possible.” Competing systems offer similar spans, depending on the depth of the joist. One homeowner explains, “I wanted to obtain open spaces. Perhaps the biggest advantage offered by metal decking systems is that they offer longer clear spans with less joist depth. But pourover systems are also used in residential settings, especially if the design calls for long open spans, high-mass floor systems, or in-floor hydronic heat. The systems are more common on commercial projects, where concrete floors are required due to fire codes. Metwood, Speedfloor and Dietrich Metal Framing also offer composite joist systems. ![]() There’s actually two versions of Hambro the D500 system uses removable plywood forms between joists, while the MD2000 uses stay-in-place corrugated steel sheets. There are at least half a dozen brands that work well with ICF walls, including EcoSpan by Vulcraft, Hambro by Canam, and Composite Total Joist by iSpan. In essence, the steel joist takes the tensile load and the concrete absorbs the compressive load, with the floor acting like a flange to prevent twisting. Steel joists topped with a corrugated metal deck and a concrete slab compose a system that is versatile, relatively light, and tremendously strong. An increasing number of homeowners, architects, and builders are finding that composite steel joist floor systems are a perfect match for ICF construction. ![]()
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