- Author
-
Greenfeld, S. H.
- Title
- Study of the Variables Involved in the Saturating of Roofing Felts.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
-
NBS BSS 019
June 1969
- Keywords
-
roofs, textiles; textiles, weatherproofing; asphalt; moisture; absorption; coatings; viscosity; specifications; penetration; wetting
- Identifiers
- roofing felts; protective coatings
- Abstract
- The degree of saturation of a No. 27 felt with a typical roll saturant and a No. 55 felt with roll, mixed, and shingle saturants varied with saturation time and pressure, saturant temperature and viscosity, felt conditions, and press roll pressure and clearance. Optimum temperature and viscosity ranges were determined for each asphalt-felt combination. Both pressure and vacuum increased the completeness of saturation under optimum conditions, but frequently shortened the working temperature range in which optimum saturation could be produced. Rate and degree of moisture and liquid water absorption decreased with increasing saturation. Air permeability decreased with increasing saturation. The consequences of some of these findings are discussed. (Author)