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Question: 05-17 Code Section: 7 Date: 5 February 2014

OBC 2012 Reference:

 

Question Submitted:

1) If a building is under construction and I install a 2" trap on a fixture, would I be able to run this trap arm 2.4 M?

2) If I am stack venting and increase a bath tub trap to 2" in order to extend the trap arm length so that I can avoid separately venting it,  would the load still be 1.5 fu's or 3 fu's?

Interpretation:

1) Yes: as per Table 7.5.6.3, the maximum trap arm length for a 2” trap, installed at a 1 in 50 minimum slope, is 2.4m.

2) 1.5 fixture units should be assigned to the bathtub as it is a listed fixture according to Table 7.4.9.3

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