09-11 Valving suites

Question: 09-11Code Section: 7Date: 9 September 2009OBC 2006 Reference:

Question submitted: (Here is) a question about valving in suites of residential occupancy. says “shut off valves” SHALL be installed as may be necessary to ensure that when the supply to one suite is shut off the supply to the rest of the building is not interrupted.

I then read Appendix A and it says fixture stopcocks or shutoff valve located immediately adjacent to a fixture MAY not be adequate to protect the water distributing piping.

What do they mean by MAY? I have situation in a seniors residence (condo) where the washroom risers are in the wall right behind the fixtures and all fixtures are valved and the kitchen risers are right behind the sinks.

It appears to be impractical to have suite shut-offs AND fixtures stops with only about six feet of distribution pipe in the washroom wall.

Interpretation: The word “may” is to ensure that the installation of the valves insures isolation as require.

Interpretation: Approved at AMES 2009