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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - Renovation: Thermal frames ? No laughter please !

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    • CommentAuthorstorm
    • CommentTimeOct 9th 2008
     
    Not sure if this makes any sense. I am having our conservatory re-vamped. Double glazed argon filled units. The walls below will be insulated with soft thin style ( 20mm ) though apparently highly insulating foil insulation. I will have this placed without the recommended air gaps ( to save space ) My idea is to instead double the amount of foil layers. ( Theory being some air will be sandwiched between and this will allow for optimum space without reducing thermal efficiency. ( daft idea ? ) In front of this will be plasterboard which I will eventually cover with paint mixed with Thermilate for optimum warmth. My question is about the wooden frame work on the inside of the conservatory which will be given a fresh coat of white paint. Would it be a waste of time/money adding Thermilate to the paint that will be used on the frame work ? Is it necessary to make the frames warm and thermally effecient ? O.k people don't laugh too loud :neutral:

    The external wall is made with large protruding decorative stone work. I notice that someone on these boards mentioned that insulating within makes external walls colder and more prone to rot. Is there anything that can be done to remedy such an eventuality ?
    • CommentAuthortony
    • CommentTimeOct 9th 2008
     
    You are not serious about the paint -- it is a waste of time and money. glass + plasterboard sounds odd and wont it go damp from condensation on the glass?

    External insulation of the stone will keep it warmer in a house but on a conservatory it cant be worth doing isnt it a part time room?
    • CommentAuthorSaint
    • CommentTimeOct 9th 2008
     
    Storm,
    Foil based insulations work only because of the air gaps. No air gaps then minimal insulation. Go for conventional style high performance insulation PIR, Aerogel etc. Especially at 20mm thickness these will far out perform foils.
    Internal insulation stops heat escaping therefore your stone walls will be colder. Can't really envisage them rotting though !!
    • CommentAuthorstorm
    • CommentTimeOct 9th 2008 edited
     
    Thank you, Tony for the reply. I think You misunderstand my meaning regards the glazing. I refer to ordinary double glazed units which will be placed * above * the walls which are rather cold and probably allow moisture in from outside, these will be covered with the insulation and then topped with the plasterboard. This is recommended by our builders. This is regular practice isn't it ?


    O.K, Saint, I have heard of Aerogel, but I gather it is rather expensive. Also problem is I have already purchased the foil insulation. The builders are hotly against the soft foil insulation and wish instead to use foil covered foam backed board which I am unhappy with as the foam stuff I feel sure is not ecologically sound and could possibly out gas. The foil insulation I have brought is at least ecologically friendly and breatheable.
    • CommentAuthorSaint
    • CommentTimeOct 9th 2008
     
    Storm,
    I see your predicament but I'd do all I could to improve on the thermal performance you'll squeeze out of a foil insulation.
    A "foil covered foam backed board " sounds curious, any brand name?
    • CommentAuthorstorm
    • CommentTimeOct 9th 2008
     
    Saint, The brand name of the board is Xtratherm.

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