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Abstract
A research facility with several test cells was constructed in the Midwest. The facility contains roof assemblies with several variables: - flat ceiling truss-framed attics and cathedral ceilings; - dark and white shingles; - vented and unvented construction; - one- and two-layer shingle placement; - measurement location toward the ridge and toward the eaves; and - roof deck installed directly over foam insulation. Thermocouples are used to measure temperature hourly at various shingle layers - north and south. Three summers of temperature data are used in this analysis and presented. The temperature profiles for each condition are compared to a base case. By using regression of the test case against the base case, adjusted for a crossing point, the resulting regression slopes can legitimately describe a percent by which the tes case is hotter or colder than the base case. Those data are presented and they permit a ranking of the various factors that affect shingle and roof sheathing temperature. An error analysis accompanies the comparision presentation. The findings are used to sponsor a discussion of the role of ventilation as a temperature regulator for roof assemblies vis-a-vis the other factors that affect temperature. The implications of that ranking on the continued use of ventilation regulations in building codes and product warranties are discussed.
A research facility with several test cells was constructed in the Midwest. The facility contains roof assemblies with several variables: - flat ceiling truss-framed attics and cathedral ceilings; - dark and white shingles; - vented and unvented construction; - one- and two-layer shingle placement; - measurement location toward the ridge and toward the eaves; and - roof deck installed directly over foam insulation. Thermocouples are used to measure temperature hourly at various shingle layers - north and south. Three summers of temperature data are used in this analysis and presented. The temperature profiles for each condition are compared to a base case. By using regression of the test case against the base case, adjusted for a crossing point, the resulting regression slopes can legitimately describe a percent by which the tes case is hotter or colder than the base case. Those data are presented and they permit a ranking of the various factors that affect shingle and roof sheathing temperature. An error analysis accompanies the comparision presentation. The findings are used to sponsor a discussion of the role of ventilation as a temperature regulator for roof assemblies vis-a-vis the other factors that affect temperature. The implications of that ranking on the continued use of ventilation regulations in building codes and product warranties are discussed.
Date
12/2001
12/2001
Author(s)
William Rose
William Rose
Page(s)
Keyword(s)
shingle temperature; sheathing; cathedral ceiling; attic; ventilation; ASHRAE; ORNL
shingle temperature; sheathing; cathedral ceiling; attic; ventilation; ASHRAE; ORNL