Minnesota Administrative Rules

4715.2550 WET VENTING.

Subpart 1.

Single bathroom groups.

A single bathroom group of fixtures may be installed with the drain from a backvented lavatory, kitchen sink, or combination fixture serving as a wet vent for a bathtub or shower stall provided that:

A.

not more than one fixture unit is drained into a 1-1/2 inch diameter wet vent or not more than four fixture units drain into a two inch diameter wet vent; and

B.

the horizontal branch drain connects to the stack at or below the same level as the water closet drain when installed on the top floor.

Subp. 2.

Double bathroom groups back-to-back.

Bathroom groups back-to-back consisting of two lavatories and two bathtubs or shower stalls may be installed on the same horizontal branch with a common vent for the lavatories and with no back vent for the bathtubs or shower stalls, provided the wet vent is not less than two inches in diameter.

Subp. 3.

Basement shower.

A basement shower may be wet vented through the waste from a laundry tub, lavatory, or sink, provided the wet vent is not less than two inches in diameter, and the drain conforms to part 4715.2620, subpart 4.

Subp. 4.

Water closet.

A lavatory may be connected to a properly installed vent from a floor-set water closet.

Statutory Authority:

MS s 326.37 to 326.45; 326B.43 to 326B.49; 326B.52

History:

L 2007 c 140 art 6 s 15; art 13 s 4; 36 SR 1479

Published Electronically:

November 13, 2012