I am in the process of laying runs of 25 mm MDPE under the suspended groundfloor of my 1909 house. The point is to replace a mixture of 15 mm copper and lead which brings the rising main through the length of the ground floor to the kitchen at the back and then to take it ( once a water softener has been installed )
into the HW/CH system and to the bathroom.
I am using MDPE because , I thought it would be easier to negotiate the length and some of the obstacles ( in practice that has proved only partially correct) # and also I thought it a good idea to increase the bore of the current 15 mm pipe work. ( I know that 25mm is the external dimention for MDPE.)
Must admit I had not thought of this in my planning .but , do I need to insulate the MDPE (which of course carries cold water only )?. I presume that I do to protect against any freezing draughts under the floor ? Dont know why I did not think of this before.
If so , what do I need to insulate with ?. I guess most of the pupose made pipe insulation is to fit 15mm and 22mm copper pipe work. Is there special insulation for MDPE for use inside a house as opposed to in the ground outside.?
Thanks for any pointers
Richard