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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.

Buy individually or both books together. Delivery is free!

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    • CommentAuthorWeeBeastie
    • CommentTimeJan 28th 2020
    About two months ago I had polythene and sand laid on the ground below my floor void. There was a white substance in places on the ground and on the brick foundation walls beforehand. I'd assumed this was efflorescence. I've just noticed there is now (presumably) the same white substance appearing on the sand, near the perimeter below a south-facing bay window. Does this suggest that this is mould rather than efflorescence? The sand was damp when laid. If mould, what should I do?

    • CommentAuthortony
    • CommentTimeJan 28th 2020
    collect some and see if it dissolves in water, it will and mould does not dissolve, i think that it will be sodium nitrate crystals
    • CommentAuthorWeeBeastie
    • CommentTimeJan 30th 2020
    Yep, efflorescence falling off the brick walls. Relieved.
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