Best Of

Cell-Core PVC looks exactly like regular PVC, just much lighter in weight. Mad Dog

sorry I keep getting confused. You said it’s just like all materials—it must be supported and installed properly. 7mm over 10 meters per 50 degrees F change doesn’t sound scary to me.

Pipe isn’t siding which can go from -20F to probably ~200F in the sun

In all my years of plumbing we never did anything special for PVC or ABS expansion. At least in residential installations. 70° ambient to maybe 105- 110° drain water temperature is common. So not a lot of movement. Maybe the dishwasher discharges hotter water for a brief period.

The metal roof makes more expansion contraction noise than the plumbing.

I imagine vinyl siding often sees a much wider ∆

I'm not a plumber, I'm an expert on residential and light commercial oil heat and hydronics, So my opinion may not hold as much weight as the others here…. But I would thing the best pipe is the one that doesn't leak! Just sayin'

Rodents love, love, LOVE fiberglass. Rockwool may be better.

I see Pace Supply carries solid ABS.

A bummer for suppliers that carry 4 inventories of PVC and ABS pipe. Plus CPVC?

Hi @ethicalpaul , Honest questions are good. As HR said, PVC drain pipe and fittings are essentially not available where I am, so the realistic choices for me are cast iron and ABS. I do wish we had never gone to foam core pipe. The only benefit is in up front cost. Orangeburg probably holds up better 🙀

Yours, Larry

Yeah, I suppose we better knock down 99% of the buildings in the US and Canada......

If rodents are getting into the building the choice of insulation isn't the problem.