CSA A123.3-05 (R2015) PDF Download

CSA A123.3-05 (R2015) is a standard that specifically focuses on asphalt saturated organic roofing felt. It is the third edition of this standard and replaces the previous editions published in 1998 and 1979. The standard falls under the CSA A123 series of standards on bituminous roofing materials.

The scope of this standard includes asphalt saturated organic roofing felt with perforations, which is used in the construction of built-up roofing membranes. It can also be used as an underlayment beneath various types of roof coverings such as asphalt shingles, wood shakes and shingles, tiles, and others. The standard specifies different types of roofing felts, including perforated felts for built-up roofing and plain, non-perforated felts for underlayment purposes.

The standard is written in SI (metric) units, in compliance with the CAN/CSA-Z234.1 standard. It provides the standard values for the different types of roofing felts, with the values given in SI units being the standard and values in parentheses provided for informational purposes.