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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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  1.  
    We're drying a property that had a burst main which flooded the area under ground, we've stripped the floor coverings to access the area and propose sheeting over the entire joist area to essentially seal the area below floor level (reducing volume of space to dry)

    We then propose to use our air movers below the sheeting to encourage extreme air flow which will then naturally vent to outside through the wall/floor vents.

    Does this sound a reasonable approach?

    We so no requirement in this circumstance to use any dehumidifiers as the extreme air circulation should be the fastest method
    • CommentAuthortony
    • CommentTimeDec 1st 2021
     
    Agree, it will dry out in time anyway, forced ventilation is a good idea it would be my preference to dehumidifier. I wouldn’t use polythene or not for long.
  2.  
    Why not use polythene Tony?
    • CommentAuthortony
    • CommentTimeDec 2nd 2021
     
    Might cause swelling and mildew on top of the floor
    • CommentAuthorGareth J
    • CommentTimeDec 2nd 2021 edited
     
    I had this problem with a sewage leak. Yuk. Built a box around the best accessible vent and fitted a fan outside sucking air out of the void. It negatively pressurised the floor void, eliminating smells in the house. Ran it until the outlet of the fan smelt bearable. Better to encourage air exchanges rather than just moving the air around underneath. Bit trickier to dry this time of year now.
  3.  
    Yeah negative pressure would be our preferred method but it would be difficult to run the fan outdoors with the rain etc. But building a waterproof box may be an idea but getting a 12" duct to fit on the air vents may be tricky
    • CommentAuthorGareth J
    • CommentTimeDec 2nd 2021
     
    A 4 or 5" inline fan? I had a high flow one kicking about so was relatively straightforward - cut a 4" hole in one side of a plastic tub and placed the mouth of the tub up against the house with a ring of soft foam to seal. Kept dry under a paving slab across two concrete blocks iirc. Blocks also allowed to maintain a bit if pressure on the seal. It took weeks though and that was in summer! Although to be fair the ground was bare earth, so a lot if drying to be done. Fortunately not many damp timbers.
  4.  
    We have a fan extracting 4000m3 an hour to outside using negative pressure and 2 of the same fans circulating the underfloor area. Seems to be drying nicely!
    • CommentAuthortony
    • CommentTimeDec 7th 2021
     
    👍
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