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Housing - Renovation: UFH + underfloor insulation

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    • CommentAuthorkrishna
    • CommentTimeFeb 4th 2008 edited
     
    I started asking this question in the "Best place to put a radiator" thread but felt I shouldn't really hijack that thread, so. On jamesingram's advice I looked at the articles on floors in the latest issue of GBM. Good stuff. But I'm still not clear on a couple of things. There is an illustration of a refurb with some insulated floor with UFH pipes. As james suggested, looked very similar to what we are trying to do. However I am a little puzzled. There was a cross section diagram which showed joist depths extended, with breathable roofing felt attached to base of the extended joists and the spaces filled with 100mm depth of warmcell on top of which was some PUR boards supported on battens attached to base of the original joists. But the photograph of the same job showed the joist 'extensions' running at right angles to the original joists, the roofing felt draped OVER the lower joist extensions and battened along the bottom of the original joists, before filling with warmcell. Hmmm... I can't quite work this one out.

    Where is the best place to put the felt and is breathable felt the best thing to use? I was planning extend my 4" joists by a further 4", but with timbers run underneath at right angles. Then staple the membrane along the bottom of the extended joists and let the insulation (Warmcell) fill the spaces to a depth of 100mm, including letting it go in the 4" gap below the original joists. Then batten and place the PUR boards above and lay UFH pipes on the board insulation. Then 20mm solid wood flooring above. Any problems with that?

    The man from building control thinks I am mad and wasting my money (too much insulation he says). He is also not sure about using breathable roofing felt (or any roofing felt) or building paper under the Warmcell as he says they haven't been tested or approved for the task. Any advice on that one?
    • CommentAuthorkrishna
    • CommentTimeFeb 4th 2008 edited
     
    Ah. Just figured out how to edit a posting, so removed the extraneous stuff now. Ignore this post.
    • CommentAuthorCWatters
    • CommentTimeFeb 4th 2008
     
    Not sure I followed all that but...

    Osma recommend their foil covered insulation under wood floors. Foil acts to spread the heat better. We have this on part of our ground floor and it seems ok...

    Example drawings from Osma UFH web site..
    http://content.wavin.com/WAXGB.NSF/3392995919048e9dc1256a09002c973e/30c5bbdf198c810c802572100051fe3a/Body/0.18E?OpenElement&FieldElemFormat=jpg

    http://content.wavin.com/WAXGB.NSF/3392995919048e9dc1256a09002c973e/30c5bbdf198c810c802572100051fe3a/Body/0.A184?OpenElement&FieldElemFormat=jpg
    • CommentAuthorkrishna
    • CommentTimeFeb 5th 2008
     
    <blockquote><cite>Posted By: CWatters</cite>Osma recommend their foil covered insulation under wood floors. Foil acts to spread the heat better. We have this on part of our ground floor and it seems ok...</blockquote>

    OK, so I could use something like foil backed Kingspan with the foil side up and place the pipes on this.

    What about the additional insulation below that? The GBMag example used 100mm Warmcell held in place by breathable felt. The illustrations are a little unclear to me, but I was proposing stapling the felt or perhaps building paper to the underside of some new "joists" run at right angles under the existing 4" joists. Then filling with 100-120mm Warmcell. Seems OK to me, but the guy from building control is concerned because it is non-standard use. I am concerned about keeping the Warmcell dry, but it is very dry under the house. Could I use some kind of garden netting instead?
    • CommentAuthortony
    • CommentTimeFeb 5th 2008
     
    If you are going to use loose fill insulation then I would have thought that a thin sheet of board fitted and fixed between the bottom of the joists would be a better option for retaining the insulant.

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