The Effects of Infrared-Blocking Pigments and Deck Venting on Stone-Coated Metal Residential Roofs

Miller, William A

Oak Ridge National Laboratory (ORNL)

关键词: Heat Transfer;    Residential Buildings;    Roofs;    Infrared Radiation;    Performance Testing;   

DOI  :  10.2172/981414
RP-ID  :  ORNL/TM-2007/049
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  981414

美国|英语

来源: UNT Digital Library

【 摘 要 】

Field data show that stone-coated metal shakes and S-mission tile, which exploit the use of infraredblocking color pigments (IrBCPs), along with underside venting reduce the heat flow penetrating the conditioned space of a residence by 70% compared with the amount of heat flow penetrating roofs with conventional asphalt shingles. Stone-coated metal roof products are typically placed on battens and counter-battens and nailed through the battens to the roof deck. The design provides venting on the underside of the metal roof that reduces the heat flow penetrating a home. The Metal Construction Association (MCA) and its affiliate members installed stone-coated metal roofs with shake and S-mission tile profiles and a painted metal shake roof on a fully instrumented attic test assembly at Oak Ridge National Laboratory (ORNL). Measurements of roof, deck, attic, and ceiling temperatures; heat flows; solar reflectance; thermal emittance; and ambient weather were recorded for each of the test roofs and also for an adjacent attic cavity covered with a conventional pigmented and direct nailed asphalt shingle roof. All attic assemblies had ridge and soffit venting; the ridge was open to the underside of the stone-coated metal roofs. A control assembly with a conventional asphalt shingle roof was used for comparing deck and ceiling heat transfer rates.