joeblack5 wrote:I used Rehau Pex with closed cell foam insulation. The Pex bond well with the closed cell foam. I hoped it would be an extra help if higher pressures would occur then the Pex in itself could handle at that temperature.
Yes it is more expensive.
I also have used 3" drainwater pipe ( thinwall) and used normal foam pipe insulation for 1" or 1 1/4" PEX. You slide and glue the drainwater pipes together as you go. So only one PEX line in one drainwater pipe. I think a little cheaper but then more hours
Good idea on the insulation! I suspect many of the hot pex failure out there are due to the deformation of the pex as it warms, making kinks, weak spots, etc, causing failures below the burst temp/pressure. Your idea takes care of that and any surrounding sharp or abrasive items, too.
Do you build a trough, spray in foam layer, insert pipe and spray it in place, or some other method?