TEMPERATURE HISTORIES OF PLYWOOD ROOF SHEATHING AND ROOF RAFTERS AS USED IN NORTH AMERICAN LIGHT-FRAMED CONSTRUCTION

摘要

Temperature histories for plywood roof sheathing and nominal 2- by 6-in. (standard 38- by 140 mm) roof rafters in nonventilated attics were monitored in outdoor attic structures using simulated North American light-framed construction. These temperatures have been recorded for 8 years in Madison, Wisconsin, USA (43°N latitude) and for 4 years in Starkville, Mississippi, USA (33°N latitude). In this paper, we present and discuss details of the influences on temperature of black versus white fiberglass shingles, dry versus humidified attic spaces, and northern United States versus southern United States geographic locations. We will also discuss current work that includes recording roof sheathing and nominal 2 by 6 roof rafter temperature histories under wood shake and wood-plastic composite roofing materials and comparing their differences from the temperatures recorded under more common fiberglass shingles. When the data from this work is combined with the FPL roof temperature model, an integrated approach to predicting roof temperatures across North America is possible.