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Title
Properties of weathered uncoated and resaturant coated bituminous built up roofing membranes
Properties of weathered uncoated and resaturant coated bituminous built up roofing membranes
Date
6/1983
6/1983
Author(s)
Robert Mathey; Walter Rossiter Jr
Robert Mathey; Walter Rossiter Jr
Page(s)
59-78
59-78
Source
Elseview Science Publishers
Elseview Science Publishers
Keyword(s)
bituminous; built up coatings; membrane; performance properties; resaturants
bituminous; built up coatings; membrane; performance properties; resaturants
Abstract
A study to compare the performance of weathered built-up membranes that had and had not been subjected to an application of "resaturant"-type coatings has been conducted. The membrane samples (asphaltic and coal-tar pitch), which were taken from roofs of buildings, ranged in age from 14 to 26 years. Sections of these roofs had been treated with one of three proprietary "resaturant"-type coatings. The age of the coatings ranged from 12 to 29 months. The membrane samples removed from the roofs were visually examined in the laboratory to determine their general condition, the extent of adhesion between plies of felts, the number of plies and the thicknesses of the interply bitumen. The visual examination indicated that damage to some areas of the top ply of felt of most of the coated coal-tar pitch membrane samples had occurred. The damage was attributed in part to removal of the aggregate surfacing prior to "resaturant"-coating application. Membrane properties measured in the laboratory for undamaged test specimens were tensile strength, load strain modulus, flexural strength, maximum deflection (flexure), coefficient of linear thermal expansion and thermal shock factor. The results are applicable only to the membranes tested because the number of membrane samples and coatings included in the study were limited. Comparisons of the average values of the properties for uncoated and comparable coated specimens in general showed no statistically significant differences. In addition, no consistent trends were found as to whether the average values of the measured properties of the coated specimens were higher or lower than those of comparable uncoated specimens.
A study to compare the performance of weathered built-up membranes that had and had not been subjected to an application of "resaturant"-type coatings has been conducted. The membrane samples (asphaltic and coal-tar pitch), which were taken from roofs of buildings, ranged in age from 14 to 26 years. Sections of these roofs had been treated with one of three proprietary "resaturant"-type coatings. The age of the coatings ranged from 12 to 29 months. The membrane samples removed from the roofs were visually examined in the laboratory to determine their general condition, the extent of adhesion between plies of felts, the number of plies and the thicknesses of the interply bitumen. The visual examination indicated that damage to some areas of the top ply of felt of most of the coated coal-tar pitch membrane samples had occurred. The damage was attributed in part to removal of the aggregate surfacing prior to "resaturant"-coating application. Membrane properties measured in the laboratory for undamaged test specimens were tensile strength, load strain modulus, flexural strength, maximum deflection (flexure), coefficient of linear thermal expansion and thermal shock factor. The results are applicable only to the membranes tested because the number of membrane samples and coatings included in the study were limited. Comparisons of the average values of the properties for uncoated and comparable coated specimens in general showed no statistically significant differences. In addition, no consistent trends were found as to whether the average values of the measured properties of the coated specimens were higher or lower than those of comparable uncoated specimens.