BCAB #1350R - Connection of Water Closets and Relief Vents to Circuit Vented Branch, Wet Vent as a Circuit Vent, Sentences 5.3.1.(2), (3) & (5); Article 5.4.5.; Sentence 5.6.3.(3), B.C. Plumbing Code

September 16, 1994

BCAB #1350R

Re: Connection of Water Closets and Relief Vents to Circuit Vented Branch, Wet Vent as a Circuit Vent, Sentences 5.3.1.(2), (3) & (5); Article 5.4.5.; Sentence 5.6.3.(3), B.C. Plumbing Code

Project Description

The project under appeal is the plumbing drainage system in a one storey office building.

Reason for Appeal (revised)

This appeal concerns connecting water closets to a circuit vented system, the location of a relief vent in a circuit vented system containing a nominally horizontal offset and the use of a wet vent as a circuit vent.

Appellant's Position

The appellant contends the following:

• that the connection between a water closet and a circuit vented branch is permitted to be up to 1 metre in the vertical plane,

• that a section of a circuit vent that becomes a wet vent may be installed in accordance with the requirements for wet vents, and

• that relief vents for a circuit vented branch are not required to be on the same horizontal plane.

Plumbing Official's Position

The plumbing official maintains that water closet arms must be installed as per the requirements for Special Waste Systems as noted in the Appendix A-4.2.1.(4). The plumbing official states that the B.C. Plumbing Code permits a circuit vent to be sized as a wet vent but must be installed in accordance with dry vents as required in the 1985 B.C. Plumbing Code.

Appeal Board Decision #1350

It is the determination of the Board that the three items under appeal in this drainage system do not contravene any specific requirements of the B.C. Plumbing Code.

George R. Humphrey, Chair