Preface
This is the third edition of CSA Standard B272, Prefabricated Self-Sealing Roof Vent Flashings. It supersedes the previous editions published in 1973 and 1978.
Major changes in this edition include
(a) the elimination of Type A and B designations;
(b) revised thickness specification for metallic materials;
(c) revised performance requirements for polymeric materials; and
(d) revised flange dimensions to match those in the National Building Code of Canada for other roof penetrations.
This Standard was prepared by the Technical Committee on Prefabricated DWV Roof Vent Flashings under the jurisdiction of the Standards Steering Committee on Plumbing Products and Materials and was formally approved by these Committees.
Scope
1.1
This Standard specifies the minimum requirements for factory-built, single or multiple-piece roof vent flashings used to effect a permanent weather seal between the flashing and the vent pipe without the use of additional sealing materials around the vent pipe. Flashings fabricated on-site are not included.
1.2
This Standard includes requirements for material, quality of work, and performance requirements for weather resistance. Methods of marking to indicate compliance with this Standard are also included.
1.3
The values given in SI (metric) units are the standard. The values given in parentheses are for information only.
