Is it OK to solvent weld PVC to CPVC? I have a Schedule 40 PVC line outside a building and need to transition to CTS CPVC for indoor plumbing (because code). I'm wondering both from a practical (will the 'dissimilar plastics' actually fuse) and legal (does UPC allow it) perspectives.
Spears and Lasco both have an IPS x CTS transition bushing (made of CPVC), I can't tell if it's only intended for going between CTS CPVC to (uncommon) Sch 40 CPVC or also perhaps for what I'm trying to do.
Of course another option is a threaded joint using MPT + FPT adapters, but since it's going to be buried I'd prefer a solvent joint.
Best Answer
My understanding is that you can do it if you use CPVC cement - but not ordinary PVC cement.
Here is one reference (from a commercial products supply company) which confirms this:
Also, here is a reference from Weld-On, one manufacturer of (C)PVC cements which also concurs with this advice:
Now, just because it is possible doesn't mean that you should do this. For one thing it might not be to code if you used materials in a way not recommended by their manufacturer. Aside from that, in a critical system (like sewage for instance) you should think carefully if it is worth taking any risk at all.
On the other hand in a nonessential area or in some kind of temporary / emergency circumstance, this might be a reasonable course of action.