I’m interested in warranty/service life of EPDM gasketed joints (in PVC or polypropylene) vs that of PVC cemented (chemically welded) joints. Am installing a furnace and would like to use polypropylene for the combustion air/vent pipes ’cause in many environmental impact categories the material itself is superior to PVC. Further, I guess I believe PVC bought at a big-box store by my HVAC contractor might not be designed specifically for HVAC venting. Centrotherm’s Innoflue and DuraVent’s PolyPro polypropylene HVAC venting products are designed from the ground up for this and are OKd by name in the furnace’s install instructions. Both use gasketed joints, not chemically welded joints.

Each is only warrantied 10 years, at least some gaskets deteriorate, so I’m thinking PVC cemented joints will last longer but don’t know. So I’ve looked for cemented PVC joint warranties to compare but think it’s not treated like a system – liquid cement shelf-life is warrantied, PVC supposedly lasts 50+ years, but I’ve found no warranties or data on average service life of the joints. I’d be more comfortable if this were a water application but don’t want to chance carbon monoxide leaks at joints.

Does anyone know if cemented (welded) PVC pipes are WARRANTIED and for how long? This would provide a direct comparison to the 10 years of confidence in the gasketed joints.

Failing warranty info, does anyone have anecdotal or, better, research- or certification/specification-based estimates of the SERVICE LIFE of EPDM gaskets (in polypropylene or PVC joints)? Or that of traditional PVC/cemented (welded) joints?

Thanks.