I'd like to bring pex lines into my garage for a utility sink and washer. They will pass through a fire wall with type x drywall.
How should I properly penetrate this wall for pex? Should I get an intumescent collar for each individual pipe in its own penetration? Should I make a larger hole with a single collar and share it?
I'm in a single family residence when attached garage; living space above and beside the garage.
Best Answer
First, this is a fire separation, not a true firewall
California Residential Code R302.6 (and the IRC it is based on) is clear on this point (italics in original):
So, you don't need to go crazy on this
From there, we chase down the reference to R302.5.3 on "other penetrations":
Item 4 of R302.11, in turn, states:
As a result of this, you don't need intumescent firestopping collars around these pipes at all, just something there (usually rockwool and a fire-resistive caulking) that will keep smoke and flames from slipping by around the pipe openings.
Since you're using intumescent collars, though, I'd use one collar/penetration per pipe -- since they work by expanding and pinching off the pipe, one-per-pipe is the only way to install them so that they'll work properly.