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We have a 4-story building with Levels 2 through 4 being residential. The first floor is retail and amenities. The 4th floor has vaulted ceilings and is essentially open as a gabled roof deck.
The plan was to use CPVC for all residential floors, and at the top floor to run pipe level and extend sprigs up to catch the peak and higher roof areas. Is this acceptable? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
10 Comments
Blaine
11/23/2023 09:41:04 am
I don’t know, but I do want to take a second this Thanksgiving and say how much I appreciate those of you who ask questions, reply, and discuss. The open dialogue and helpful learning that Joe facilitates is very helpful and a testament to our profession. Thanks to everyone who posts and lurks!
Scott McBride
11/23/2023 09:46:19 am
CPVC is typically not left exposed. When piping is left exposed it reverts back to steel piping. Best to follow the mfg's installation manual and ask the AHJ. It will tell you how their piping can be installed.
Dan Wilder
11/23/2023 11:37:26 am
Most exposed installations required smooth, flat, horizontal ceilings. You can refer to the installation requirements of the MFG being used for the exposed installation requirements.
Sean Kostka
11/23/2023 01:03:41 pm
Is your system wet or dry? What attic scheme are you proposing?
Alex
11/24/2023 07:49:02 am
Happy Thanksgiving!
Patrick Drumm
11/24/2023 08:43:02 am
I agree that you'll need to apply your situation to the requirements of the manufacturers cut sheet and the applicable approvals. I would also caution you to take particular note regarding sprinkler head orientation with your long sprigs. If you're planning on running low and sprigging up to a "gabled" roof deck, you may have to add some fitting to comply with orientating the deflector to the deck above.
Jesse
11/26/2023 06:33:42 pm
CPVC can be exposed as long as it meets the listing in the data sheet for the ceiling. Although, I typically transition to steel for aesthetic reasons.
Cesar Flores
11/26/2023 07:07:26 pm
You can use CPVC with special attic sprinkler and you can have sprig-up of CPVC per specs of the special attic sprinkler manufactured. The sprinkler that I seen the most on the field is the Tyco BB1,SD1, HIP and AP. There other manufacturers.
Kimberly Olivas
11/27/2023 10:38:40 am
You cannot leave CPVC exposed, so you can do the design you speak of with black pipe, but why not run at a 12" centerline from BOD and then your heads are sloping with the deck as they should. You will then just have to add a drain line for one side, probably. Run a gang drain off the branch lines, or something like that. I'm not sure you can use the attic heads if this area is ceiling for the fourth floor. It is not an attic.
Patrick Drumm
11/27/2023 11:48:42 am
I agree with Kimberly that in this case it doesn't seem like you can utilize Attic heads in this application. As described in the original inquiry, "vaulted ceilings and is essentially open as a gabled roof deck", would not be an Attic and attic heads would not be compliant. Leave a Reply. |
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