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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthoraa44
    • CommentTimeJun 9th 2014
    I am starting to plan the plumbing for our new house. I know that for the hot water pipes I need to put as much insulation on as possible but, for the cold water pipes, the issue is more about stopping condensation on the pipes. I will probably be using something like Climaflex for the pipe insulation. Can anybody give me any guidance on what thickness of insulation I would need on a 15mm plastic pipe to avoid condensation. (Assuming pipes running through heated enevelope of airtight, mechanically ventilated house.)

    • CommentAuthortony
    • CommentTimeJun 9th 2014
    Why must you insulate the hot pipes?

    All that will leak out anyway, simply a matter of time.

    Cold pipes are a problem, will you have a cold store in the loft?

    Plastic pipes might be a good choice, 15mm of insulation would be best and vapour closed with taped joins.
    • CommentAuthoraa44
    • CommentTimeJun 10th 2014
    Hi Tony, It will be an unvented system, so no tank in the loft. I wasn't going to insulate any of the heating pipes, but I was assuming that I would get a more constant hot water supply out of the taps (after the initial wait), if I insulated the hot water pipes (e.g. repeated use of the hot tap at the kitchen sink).
    • CommentAuthoraa44
    • CommentTimeJun 10th 2014
    Just to add that frost protection isn't an issue. All the pipes are within the heated envelope and, being right by the sea, on an island, -2 is about as cold as it gets. Even if the house had no heat for days on end, it wouldn't get cold enough to freeze the pipes.
    • CommentAuthorjamesingram
    • CommentTimeJun 10th 2014 edited
    I think there is some value in insulating HW pipes along well used short runs (definately necessary close to tank area) But more so in using smaller bore pipe were a lower flow rate is sufficient and designing run to be as short as possible. Check out the AECB water standards for some guidance of flow rates etc.
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