I recently had central heating installed in my 2 bedroom ground floor maisonette. We installed all the pipes in the channels which we dug in the concrete floor. I have covered all the pipes with insulation and now it is the time for refilling the channels and then covering all the floor with laminate/wood flooring.

I have cut some pipe insulation and fit them to the pipe just to keep some space for expansion and contraction; I am planning to put some sand (dried sand used for driveways) in the channels, say 2cm, and then fill them up with mortar.

My question is can I use mortar to fill the channels?

  • I hope you didn't put insulation on top of the pipes, between them and the finished floor…
    – iLikeDirt
    Commented Feb 9, 2016 at 15:11

1 Answer 1


How wide are the channels? Mortar is ok for smaller areas less than 3/4" any bigger than this I would want to use fine aggregate cement (not just sand as in Mortar).

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