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Abstract
The effects of thermal movement of bituminous built-up membranes are related to some common failures of built-up roofing observed in field exposures. A procedure for determining the amount of thermal movement of built-up membranes is described. Data are given for the thermal movement of various bitumens and reinforcing felts used in the construction of built-up roofs and for the composite membranes over a temperature range of 30 F to -30 F. The data obtained are related to field experience, and suggestions are presented that will prove beneficial in reducing the incidence of built up failure due to thermal movement.
The effects of thermal movement of bituminous built-up membranes are related to some common failures of built-up roofing observed in field exposures. A procedure for determining the amount of thermal movement of built-up membranes is described. Data are given for the thermal movement of various bitumens and reinforcing felts used in the construction of built-up roofs and for the composite membranes over a temperature range of 30 F to -30 F. The data obtained are related to field experience, and suggestions are presented that will prove beneficial in reducing the incidence of built up failure due to thermal movement.
Date
3/1965
3/1965
Author(s)
William Cullen
William Cullen
Page(s)
6
6
Keyword(s)
felt; thermal shrinkage; built up roofing; strength properties; materials; test procedures; failure; underlayment
felt; thermal shrinkage; built up roofing; strength properties; materials; test procedures; failure; underlayment