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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthorRex
    • CommentTimeSep 1st 2017
    What ho one and all,

    Because I built my house, I am obviously an expert on all domestic issues!

    Another neighbour has asked me about her rising damp issue. As it happens, she had cavity
    wall insulation some time ago. However, after some investigation by Rentokil and a local
    plumber to check if the heating system was faulty, she has told me that back in June, she
    had the heating system power flushed.

    Apparently, she was warned that because of the pressure, there is a remote risk of a
    subsequent leak. It seems the leak is under the concrete floor beside a bay window, where
    there is a small radiator.

    I know next to nothing about power flushing, and although I realise that is can stress the
    system, is it likely to cause a leak somewhere under the floor, where all the pipework is
    encased in concrete screed?

    Thanks and toodle pip

    • CommentAuthortony
    • CommentTimeSep 1st 2017
    Copper pipes encased in concrete screed are very likely to pinhole through corrosion with or without power flushing, the older they are the more likely rising to above 50% after 25 years and virtually guaranteed after 35.
    • CommentAuthorJeff B
    • CommentTimeSep 1st 2017
    A previous house I owned had leaking CH pipes in the screed after 7 years. The pipes were plastic coated except for the soldered joints - guess where the leaks occurred? This was without powerflushing (was that around in 1977?).
    • CommentAuthortony
    • CommentTimeSep 2nd 2017
    Where no plastic, on the corner of elbows too
    • CommentAuthorCWatters
    • CommentTimeSep 4th 2017
    Before digging anything up it would probably be worth trying to isolate that section of pipe and doing a pressure test. eg pressurise it and leave it overnight to see if there is a pressure loss.

    You can also get Central Heating Leak sealers from places like Toolstation or Screwfix but it would be worth confirming if there really is a leak first and where it is.

    Did your neighbour say how much she paid for the power flush? Some companies charge rip-off prices for power flushes that aren't always necessary.
    • CommentAuthorRex
    • CommentTimeSep 5th 2017
    Thanks for the comments. I have passed them to the neighbour and the ball is in her camp.

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