5 ms·
Pex doesn't insulate as well as PPr (thinner wall) and the fittings always introduce flow resistance and produce turbulent flow since they go into the pipe. Thr
by petre 9y ago
Pex doesn't insulate as well as PPr (thinner wall) and the fittings always introduce flow resistance and produce turbulent flow since they go into the pipe. Thread fittings for Pex area usually leaky. I would never use them except for serviceable manifolds with easy access, otherwise use press fit fittings. On the other hand PPr fittings go outside the pipe, just like those for copper and they're heat fused. PPr pipes are quite freeze-prone, the walls are thick (6 mm for a DN25 pipe) and glass fibre inserion PPr pipes don't have such a huge thermal expansion as pipes w/o insertion (only suitable for up to 60..68°C = hot water). Most plastic piping is prone to thermal expansion. PPr does not look pretty so it should be probably ran through walls and floors.
Copper water pipes should always be insulated with at least 6 mm EPE sleeves or closed cell elastomeric foam sleeves (better). Even cold water pipes should be insulated at least in heated or high humidity spaces because of condensation that forms on the pipe.
- aesh2Xa1 9y agoWell, the article explicitly states one should use "outie" style fittings for PEX. Check the fittings figure on the last page; letter (C).
- japanuspus 9y agoExactly: Modern PEX fitting go on the outside. Where I live (Denmark), PEX is used almost exclusively for new residential installations, but I haven not seen an in-pipe PEX fitting since my parents build their house in the 80's.
- deleted 9y ago[deleted]
- DannyBee 9y ago"Pex doesn't insulate as well as PPr (thinner wall) and the fittings always introduce flow resistance and produce turbulent flow since they go into the pipe." Errr, i have used systems of pex with outside fittings forever. Yes, inside fittings suck. All of the manufacturers have been sued for leaking, etc. "Copper water pipes should always be insulated with at least 6 mm EPE sleeves or closed cell elastomeric foam sleeves (better). Even cold water pipes should be insulated at least in heated or high humidity spaces because of condensation that forms on the pipe." Yes, they should. But they very rarely in my experience (or they did a super shitty job) are unless the house was just built and you had a good code inspector