Insulating Push-Fit Fittings — How?

Bendy_House

LWM, have you planned these pipe runs so that 15mm pipe is supplying, say, a max of two rads? (Although they'll likely handle more). I haven't seen much reference to 22mm pipe in your dealings, so just wish to check.

Using push-fits on copper pipe is absolutely fine, as long you take extra care to deburr the pipe ends, and insert them dead straight, with a twist and ideally an extra smear of sili grease. I used to choose Bartol 'Acorn' fittings for this, as they could be dismantled and the parts fitted carefully over the pipe - esp the O ring - before reassembling the fitting (paranoid? Moi?)

I would certainly choose 'push' over 'compression'.

As asked above, why not use plastic pipe in all the hidden areas?

To insulate, I usually do as Section suggests - cut two pieces of insulation long enough to cover the fitting, slice one down the provided line and place it on the fitting. Mark the width of gap remaining, and cut a slice out of the second piece to suit - cut straight along its length, and with the knife blade pointing towards the insulation centre; the section you remove should fit the gap neatly enough. Wrap with Duct tape, and ditto to the rest of the insulation.