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Home / Building Green / Air Tightness

Air Tightness of SIPs

National Tests Verify R-Control SIPs Outperform Conventional Framing

An R-Control SIP test room significantly outperformed a 2x6 stick-framed and fiberglass-insulated room in testing under identical laboratory conditions at Oak Ridge National Laboratories (ORNL). Results from a carefully monitored and instrumented study in ORNL’s climate simulation laboratory showed that R-Control SIP construction is more energy efficient and far more airtight than stick-frame construction. ORNL SIP Wind Test

ORNL Testing Method

The ORNL test setup created identical climate conditions and measured the airtightness and the heating energy requirement of the two rooms. ORNL testing demonstrated that R-Control SIP connections created a structure which was virtually air tight. This contrasted to stick built walls which had considerable air leakage. Dramatically reducing air infiltration provides a more comfortable interior environment, an advantage in building with R-Control SIPs.

Blower Door Testing

The room with 4 1/2-inch SIP walls, a SIP ceiling, a window, a door, pre-routed wiring chases, and electrical outlets showed 90% less air leakage than an otherwise identical room built with 2x6 studs, OSB sheathing, fiberglass insulation, and drywall. At 50 pascals of negative pressure, the stick-built room leaked 126 cubic feet of air per minute (CFM), while the R-Control SIP room loss was a mere 9 CFM. ORNL Whole Room SIP Test