Structural Thermal Breaks for Steel Framing
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Fabreeka's Thermal Insulation Material can provide a much needed thermal break between flanged steel framing. Photo credit: Fabreeka International Steel beams are a prime pathway for transferring heat and cold in and out of buildi... but what happens when the steel beams penetrate the building envelope? According to Robert Haley, engineering manager at Fabreeka International, a steel or concrete balcony significantly increases heat transfer, and this temperature difference leads to condensation and other building problems. (Schoeck's Isokorb system acts as a thermal break in cantilevered concrete slabs; see more in GreenSpec or Product of the Week Blog . Fabreeka's also makes makes thermal insulation washers and bushings. Photo credit: Fabreeka International It's a thermal break... Made from a fiberglass-reinforced composite, Fabreeka International's Thermal Insulation Material (TIM) does not have the thermal resistance of pure insulation materials, but its per-inch R-value of about 0.6 (BTU/Hr/ft2/in/°F = 1.8), is far superior to steel (R-0.003) or concrete (R-0.08), providing a structural thermal break between flanged steel framing members. And it can support loads As mentioned, there are a lot of insulating materials available, but few that are capable of structural support. There are a number of variables that impact a material's structural performance, of course, but Haley says, "the compressive strength of our thermal material is 38,900 PSI where A36 steel is 36,000 PSI." He continued, "The connection is up to the structural engineer, but the TIM material properties were chosen so that the structural integrity of the connection will not be compromised." TIM has other applications beyond balconies The performance of the material depends on thickness, of course, but Haley said TIM is particularly effective when used between materials with large temperature differences, such as "machinery and industrial applications where very high or very low temperatures are connected to an area where these extremes are not desired." But, he cautioned it has limits, and should be used in applications between –60°F and 260°F, though the material has been tested for UL 723 test for flame spread/smoke density, ASTM D229 for flame resistance, and ASTM E 1354 for heat release and ignition time. TIM is available in ¼"-, ½"-, and 1"-thick sheets or as thermal break washers, but it can also be cut to custom dimensions. Because the product is new, the company does not have any performance feedback from customers, but we will keep in contact and update this information as soon as it is available. Brent Ehrlich is the products editor at BuildingGreen, Inc.