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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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    • CommentAuthornigelm
    • CommentTimeNov 9th 2017
    I have a number of steel beam ends sitting on top of a stone wall effectively creating thermal bridges. These are only 50mm Square beams, not carrying huge loads, maybe 150kg each. I am looking for an insulating material for the beams to sit on. I can then insulate arround and inside the steel ends mitigating the thermal bridge.
    I would use timber pads but they would be in the insulation layer and eventually rot out.
    • CommentAuthortony
    • CommentTimeNov 9th 2017
    • CommentAuthorTimSmall
    • CommentTimeNov 9th 2017
    You need to know the worst case load under the beam ends, and the area of the beam which will bear onto the thermal break material. That will allow you to calculate the bearing pressure.

    These might be suitable depending on the bearing pressure:

    1. High strength AAC block (use DPM/DPC to keep dry)
    2. Low strength AAC block (use DPM/DPC to keep dry)
    3. Foamglass
    4. Compacfoam
    5. Purinit
    6. XPS

    That's in order of compressive strength (high to low), and also in order of thermal resistance (low to high)
    • CommentTimeNov 9th 2017
    If you put a spreader plate or padstone under the beam end, the bearing pressure under that will be reduced to a fraction and a lo-strength hi-insulation material might do - but of course the insulated (heat transmission) area has increased pro rata - but then again that's only part of the insulated area (non-loadbearing top/sides/end of the beam).
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