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Building with sip panels12/12/2023 A few manufacturers produce SIPs in a continuous or single-panel lamination process in which polyisocyanurate (a type of polyurethane foam) is injected between the two OSB skins. Most SIPs today are made with 7⁄ 16” (11 mm) to 5⁄ 8” (16 mm) OSB skins glued to expanded polystyrene (EPS) insulation cores. He glued plywood skins to both sides of Styrofoam® extruded polystyrene. The first SIPs were reportedly made in the 1950s by architect Alden Dow, the brother of Dow Chemical’s founder. There are also similar but non-structural panels, with OSB on the exterior and drywall on the interior, made for enclosing timber-frame structures. The term “stressed-skin insulating core panel” is a more technically accurate description of this type of panel, but we’ll stick with the industry convention and use the more generic name. Structural insulated panels have two structural panels (skins), usually oriented-strand board or OSB, on either side of an insulating core. This article examines the energy and resource benefits of structural insulated panels, while also addressing some of the other, less publicized environmental considerations related to SIP construction, including indoor air quality, durability, and life-cycle concerns about foam insulation. ![]() SIPs are incorporated into some of the highest-profile green demonstration homes that have been built in the ‘90s. They are widely believed to reduce wood use, but their benefit in that arena may be overstated. From an environmental perspective, SIPs offer superb energy performance, both high R-value and excellent airtightness. ![]() SIP construction is attractive in part because it allows very rapid erection of a building shell, helping to control labor costs while reducing dependence on skilled framing contractors. ![]() Though SIP houses today represent less than 1% of residential and light commercial buildings, Cynthia Gardstein, Executive Director of the Structural Insulated Panel Association (SIPA), believes the market share will grow to 5% in just a few years. Over the past few years, growth in this building system has been occurring at a rate of about 30% per year. Structural insulated panel home under construction using R-Control® EPS-core panels.
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