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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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    • CommentAuthorgoodevans
    • CommentTimeMay 27th 2018 edited
    I know I will not much heating in my attic roof space - but I think I will need some simply because of the surface area of the envelope. I am attemting to get an RHI payment for ASHP so all the rooms will have to be heated by the system. I think that most of the time the ASHP will be running at it's lowest temp output.

    Choices upstairs are - v. large radiators, smaller fan assisted radiators (tho they usually need 35 deg C water to work as designed).

    Or I can extend the UFH upstairs using aluminium spreader plates like this: https://www.wundatrade.co.uk/shop/home/joist/600mm-spreader-plate/

    The way I see it - I could place these in the sloping part of the ceiling behind the plasterboard to make a big radiator (300mm of rockwool over the roof envelope) - or under the floor (with the rockwool sound insulation immediately underneath the plate. The advantage of the ceiling option is that there will be good heat transmission (no wood flooring to get through) but some extra loss due to the extra heat being near to the envelope. But 3 or 4 m2 of ceiling radiator may be enough to satisfy the heating requirement relatively cheaply (less than £10 / m2 of radiator).

    any thoughts?
    Check out

    We used it on our upper floors under wood flooring. we also put acoustic insulation between floor joists. The 22mm they need might be an issue for you if it's a conversion.

    Recent-ish thread about whether the heat consumption of an insulated upstairs room is enough to be worthwhile plumbing in wet heating

    Edit: http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15448
    Thread about using ufh pipe in ceiling to make a big low-temperature radiator. I never got round to trying it but the numbers looked promising.
    • CommentAuthortony
    • CommentTimeMay 27th 2018
    Use the floor not the walls

    I don’t recon any heating will be needed but you need for the RHI
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