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Title
Dimensional Stability and Reflectivity of Field-exposed TPO Roof Membranes
Dimensional Stability and Reflectivity of Field-exposed TPO Roof Membranes
Date
9/2011
9/2011
Author(s)
A Delgado; C Chapman; K Barnhardt; J Carlson; R Ober; D Wacenske; S Moskowitz; M Ludwig; S Elliott; R Paroli
A Delgado; C Chapman; K Barnhardt; J Carlson; R Ober; D Wacenske; S Moskowitz; M Ludwig; S Elliott; R Paroli
Page(s)
Keyword(s)
TPO; linear dimensional stability; reflectivity; water absorption; surface characteristics
TPO; linear dimensional stability; reflectivity; water absorption; surface characteristics
Abstract
This paper summarizes some results from TPO roof membranes exposed for up to 10 years in different climatic regions of the western U.S. Properties such as linear dimensional stability of the seven-year samples were evaluated and compared with the unexposed membranes. The reflectivity of the unexposed three-, seven- and 10-year exposed samples also was evaluated in the laboratory using UV-VIS Near-IR and values compared with those available from the field. In general, the analyses showed the linear dimensional stability did not change significantly up to seven years’ exposure. The small variations observed in the membrane’s linear dimensional stability were not significant and can be considered within the experimental error. The reflectivity of some roof membranes increased slightly after cleaning the surface with a damp cloth a second time. Similar results were obtained in the field after cleaning the roof membranes using two cleaning methods. No reflectivity data is available for “seven years exposed in Alaska” and all “10 years’” samples. Therefore, it was not possible to make any comparison for the membranes.
This paper summarizes some results from TPO roof membranes exposed for up to 10 years in different climatic regions of the western U.S. Properties such as linear dimensional stability of the seven-year samples were evaluated and compared with the unexposed membranes. The reflectivity of the unexposed three-, seven- and 10-year exposed samples also was evaluated in the laboratory using UV-VIS Near-IR and values compared with those available from the field. In general, the analyses showed the linear dimensional stability did not change significantly up to seven years’ exposure. The small variations observed in the membrane’s linear dimensional stability were not significant and can be considered within the experimental error. The reflectivity of some roof membranes increased slightly after cleaning the surface with a damp cloth a second time. Similar results were obtained in the field after cleaning the roof membranes using two cleaning methods. No reflectivity data is available for “seven years exposed in Alaska” and all “10 years’” samples. Therefore, it was not possible to make any comparison for the membranes.