PEX (plumbing) questions

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JD
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I would use copper or galvanized for the T&P valve. If the valve operated properly, the water coming out would be higher than the rating of all plastics. But I see PEx, CPVC and even PVC 90% of the time.
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All information and advice given is for entertainment and informational purposes only. The person doing the work is solely responsible to insure that their work complies with their local building code and OSHA safety regulations.
mdnagel
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Joined: Thu Jan 06, 2011 12:39 am

Here's what the American Society of Home Inspectors (ASHI) have to say about this (I think that I'll look to consult here more often):

[From http://www.ashireporter.org/articles/ar ... px?id=1568]

Approved piping materials

Another common mistake made by the weekend warrior is to use PVC pipe to handle the discharge from TPR valves. Polyvinyl chloride (PVC) is not a water distribution pipe. In plumbing, PVC is primarily used for water service and DWV applications. CPVC is a water distribution pipe and both the 2006 IPC and the Plastic Pipe and Fitting Association state that TPR discharge piping is an acceptable application for the pipe. The PPFA states that a metal-to-CPVC transition fitting should be used at the TPR valve connection.

Though polybutylene, cross-linked polyethylene (PEX) and some derivatives of these very flexible piping materials are listed under table 605.4 in the IPC, the table that defines acceptable pipe for TPR discharge, you should check with your local authority for a list of approved materials. Because of the difficulty in securing and maintaining proper slope without some trapping and because these pipes sometimes use insert fittings, they can restrict and reduce the flow. They may not be approved in your area or have some restrictions if used.

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