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Committee Log In
Interpretation #5134
Original Request
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Date:
June 13, 2007
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Requested By:
ROBERT E MOSS
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Requester E-Mail:
RMOSS@ALLIANCEDESIGNGROUP.COM
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Code Version:
2004
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Code:
PLUMBING
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Code Description:
Plumbing
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Chapter:
9
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Section:
909
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Topic:
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Question:
The section states that the "horizontal branch
drain" to a bathroom group is a wet vent when
sized according to Table 909.3. If a drain line
to a fixture that empties into the "horizontal
branch drain" is also sized according to Table
909.3, is it also a wet vent? This would imply
that the drain line to the fixture would serve as
the vent to the fixture and not have to be
withing venting distance, per Tabale 906.1, to
the "horizontal branch drain".
Section 909.1 does not say that the "horizontal branch
drain" to a bathroom group is a wet vent when sized
according to Table 909.3. Section 909.1 states, "The wet
vent ... shall extend from the connection of the dry vent
(usually the top of the lav connection tee) along the
direction of flow in the drain pipe to the most downstream
fixture drain connection to the horizontal branch drain."
Table 909.3 is used for sizing only when the design meets
the definition above. A wet vent must be sized per Table
909.3. Only bathroom group fixtures as defined in Chapter
2 are permitted to connect to the wet vent and they are
also permitted to be individually or common vented. The
trap to vent distance for common vented or individual
vented fixtures would be from the trap to the common or
individual vent, not to the wet vent. There is no limit to
how far a common or individual vent is located from the
wet vent to which it connects and it is not required to
size the line to an individual or common vented fixture
per Table 909.3
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