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 side. 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 test 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 comparison presentation. The findings are used to sponsor a discussion of the role of ventilation as a temperature regulator for roof assemblies visa- 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.
Authors: William B. Rose
Citation: Thermal Performance of the Exterior Envelopes of Buildings VIII
Keywords: December, Florida, 2001
Citation: Thermal Performance of the Exterior Envelopes of Whole Buildings VIII
Product Details
- Published:
- 2001
- File Size:
- 1 file , 5 MB
- Product Code(s):
- D-7966
