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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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    • CommentAuthorShevek
    • CommentTimeApr 8th 2022 edited
     
    We're about to lay a floating floor in our apartment as follows:
    - 14 mm engineered wood click boards (with 3mm pre-finished oak top layer)
    - 2-3 mm cork (or rubber cork) underlay for sound insulation
    - existing structural floor is beam and block with screed, and we're at first floor level over another apartment

    When I discuss the cork underlay at various outlets here (in Portugal) they always recommend laying a vapour impermeable membrane before putting the cork underlay down, even though we're at first floor level.

    I presume this is because the concrete can absorb moisture from the air and then it'll want to head for the dry cork and wood?
    • CommentAuthorMike1
    • CommentTimeApr 8th 2022
     
    Cork is water-resistant and mould-resistant, so I can't see a reason for that at first floor level. What is their explanation?
  1.  
    Posted By: ShevekWhen I discuss the cork underlay at various outlets here (in Portugal) they always recommend laying a vapour impermeable membrane before putting the cork underlay down, even though we're at first floor level.


    Posted By: Mike1What is their explanation?

    'cos they always do = Butt covering !!
    • CommentAuthortony
    • CommentTimeApr 8th 2022
     
    I would worry about the lease excluding using ‘hard’ flooring
    •  
      CommentAuthordjh
    • CommentTimeApr 8th 2022
     
    Posted By: Shevek- 2-3 mm cork (or rubber cork) underlay for sound insulation
    For noise insulation I'd tend to use the rubber cork for choice. (If it's what I think it is - loose pieces of cork in a rubber base) and I suspect you'd want a bit more than 2-3 mm. Do the manufacturers produce any dB numbers?

    And I tend to agree with Mike and Peter. I can't see any lease in a hot country like Portugal saying anything about hard floors. I expect tiled floors and the like are the norm?
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