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Abstract
This paper discusses the effect of radiation control coatings on rough-surfaced, low-slope roofs at a federal facilty in the Panhandle of Florida. Two gravel-topped, moderatley well insulated, low solar reflectance built up roofs were spray coated with a white, latex-based product with ceramic beads. One roof was significantly shaded and its building had high internal loads. The other had a thermally massive deck but its building had little internal load. Samples ofthe coated roofs were brough periodically to the laboratory to measure the solar reflectance as the coating weathered. Relative to the uncoated BUR, the fresh coatings increased the solar reflectance from 0.09 to about 0.53, which is at least 0.2 lower than has been observed for similar fresh white coatings on smooth, low-sloped surfaces. In the course of the project, from 07/96 to 10/97, the reflectance for the shaded BUR decreased to 0.42 while the other decreased to 0.50. On smooth, low-slope surfaces after several years of weathering, values as low as 0.50 to 0.55 have been observed.
This paper discusses the effect of radiation control coatings on rough-surfaced, low-slope roofs at a federal facilty in the Panhandle of Florida. Two gravel-topped, moderatley well insulated, low solar reflectance built up roofs were spray coated with a white, latex-based product with ceramic beads. One roof was significantly shaded and its building had high internal loads. The other had a thermally massive deck but its building had little internal load. Samples ofthe coated roofs were brough periodically to the laboratory to measure the solar reflectance as the coating weathered. Relative to the uncoated BUR, the fresh coatings increased the solar reflectance from 0.09 to about 0.53, which is at least 0.2 lower than has been observed for similar fresh white coatings on smooth, low-sloped surfaces. In the course of the project, from 07/96 to 10/97, the reflectance for the shaded BUR decreased to 0.42 while the other decreased to 0.50. On smooth, low-slope surfaces after several years of weathering, values as low as 0.50 to 0.55 have been observed.
Date
12/1998
12/1998
Author(s)
T Petrie; P Childs; J Chrisitan
T Petrie; P Childs; J Chrisitan
Page(s)
353-372
353-372
Keyword(s)
radiation control coating; low slope;
radiation control coating; low slope;