BCAB #1260 - Combustible DWV Pipe Penetrating Fire Separations, Sentences 3.1.7.3.(1) and 3.1.7.3.(2)

August 19, 1991

BCAB #1260

Re: Combustible DWV Pipe Penetrating Fire Separations, Sentences 3.1.7.3.(1) and 3.1.7.3.(2)

Project Description

Drain, waste and vent piping system in a three storey wood frame apartment building.

Reason for Appeal

Sentences 3.1.7.3.(1) & (2) do not permit combustible DWV piping to be used where any part of the DWV piping system penetrates a fire rated assembly or membrane unless the assembly or membrane including the penetration will pass the CAN4-S101 fire resistance test.

Appellant's Position

The appellant has designed a drain, waste and vent piping system combining metal and plastic pipe and listed fire stop sleeves or "donuts" which he feels meets the requirements of Sentences 3.1.7.3.(1) & (2). (see Diagram A)

Building Official's Position

The building official has rejected the design but comments were not received by the Board.

Appeal Board Decision #1260

It is the determination of the Board that combustible and noncombustible pipe may be used in the same drain, waste and vent piping system where part of the system penetrates an assembly or membrane required to have a fire resistance rating. Piping that penetrates a fire separation must not impair the ability of the fire separation to meet the requirements of the CAN4-S101 fire resistance test. If the penetration is made with combustible pipe the penetration must be protected with a fire stop device conforming to CAN4-S101.

George R. Humphrey, Chair