- Author
- Cullen, W. C. | Boone, T. H.
- Title
- Thermal-Shock Resistance for Built-Up Membranes. Section 2. Thermal-Shock Resistance for Bituminous Built-Up Roofing Membranes - Its Relation to Service Life.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
- NBS BSS 009, August 21, 1967, 7 p.
- Keywords
- membranes | roofs
- Identifiers
- bituminous-built-up roofing; service life; thermal-shock resistance factor; tension splitting
- Abstract
- The assignment of a service life to a bituminous built-up roofing system is frequently difficult because of the many variables involved. A knowledge of these variables, and of their effect on the performance of the total building system, will greatly assist in the selection of a roofing assembly and the assignment of a service life to such an assembly. Some of the factors such as breaking load in tension, modulus of elongation, and apparent linear thermal expansion coefficient of roofing membranes of different composition are given for both laboratory-prepared and field-obtained samples. Membranes of 2, 3, and 4-piles of felt are included. The relations of some engineering properties of a roofing membrane to performance in service as expressed by a Thermal-Shock Resistance Factor are also given. Ways and means to reduce potential failures of bituminous built-up roofing membranes resulting from thermally induced forces are discussed.