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Abstract
During 1994, simultaneous full-scale testing of residential plywood decked roofing sytem was conducted using a flexible roof facility. Throughout the test protocol one cell was configured as a residential black-shingle roof system, employed as the baseline for comparison of the alternative roofing sytems. Two identical cells were employed during the summer of 1994 to investigate soffit and ridge venting. Tests of two different configurations best illustrate the results. A comparison of a sealed attic to an attic with high profile ridge vent and well vented soffits showed that a vented attic reduced the ceiling heat flux by 66%. A comparison of the well vented attic to an attic with a perforated soffit showed 25% less ceiling heat flux through the well vented attic. The effects of ridge venting seem to be nominal when compared to the effect of soffit venting, causing at best, a 4% heat flux difference. A simultaneous study was carried out to determine the thermal effects of tile roofing systems. Also investigated was the effect of venting on tile roofs. A tile roof was installed on cell 1 on 8/27/93. This roof was built to maximize under tile ventilation and ridge ventilation. It featured a counter batten installation modified to provide venting under the tile and out of the attic cavity. On 09/1/94, a direct nailed tile roof was installed on cell 4. The vented tile roof reduced ceiling flux by 48% compared to the black shingle roof, while the direct nail installation returned a flux reduction of 39% It appears that the tile thermal mass and intersitial ventilation around each tile are the predominant phenomena reducing the cooling load in such roofs.
During 1994, simultaneous full-scale testing of residential plywood decked roofing sytem was conducted using a flexible roof facility. Throughout the test protocol one cell was configured as a residential black-shingle roof system, employed as the baseline for comparison of the alternative roofing sytems. Two identical cells were employed during the summer of 1994 to investigate soffit and ridge venting. Tests of two different configurations best illustrate the results. A comparison of a sealed attic to an attic with high profile ridge vent and well vented soffits showed that a vented attic reduced the ceiling heat flux by 66%. A comparison of the well vented attic to an attic with a perforated soffit showed 25% less ceiling heat flux through the well vented attic. The effects of ridge venting seem to be nominal when compared to the effect of soffit venting, causing at best, a 4% heat flux difference. A simultaneous study was carried out to determine the thermal effects of tile roofing systems. Also investigated was the effect of venting on tile roofs. A tile roof was installed on cell 1 on 8/27/93. This roof was built to maximize under tile ventilation and ridge ventilation. It featured a counter batten installation modified to provide venting under the tile and out of the attic cavity. On 09/1/94, a direct nailed tile roof was installed on cell 4. The vented tile roof reduced ceiling flux by 48% compared to the black shingle roof, while the direct nail installation returned a flux reduction of 39% It appears that the tile thermal mass and intersitial ventilation around each tile are the predominant phenomena reducing the cooling load in such roofs.
Date
12/1995
12/1995
Author(s)
David Beal; Subrato Chandra
David Beal; Subrato Chandra
Page(s)
753-760
753-760
Keyword(s)
summer performance; thermal performance; tile roof; humidity; attic ventilation; ridge vent; soffit vent; sealed attic
summer performance; thermal performance; tile roof; humidity; attic ventilation; ridge vent; soffit vent; sealed attic