Cathedral Ceilings
Return to House Overview >> Beauty. Drama. A bit of pizzazz. Cathedral ceilings make a statement. But they also create extra air space that has to be heated in winter and cooled in summer. To help you maintain maximum energy efficiency, we offer two high-density insulation products designed specifically for the rafters in cathedral ceilings. Designed to maximize your home's R-value, these products also ensure proper ventilation through the ceiling rafters.
The rafters in cathedral ceilings are usually made of 2x12s or 2x10s, and Owens Corning makes two special high-density insulation products specifically for these rafters -- R-38C for 2x12s and R-30C for 2x10s. These products are appropriate for cathedral ceilings because the R-38C batt is 10 1/4 inches thick, which leaves over one inch of vent space for free air flow in a 2x12 joist. The R-30C batt, at 8 1/4 inches thickness, is designed to do the same thing in a 2x10 joist.