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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.

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    • CommentAuthorDonkey
    • CommentTimeJan 8th 2017
     
    Has anyone used this product for sealing wall chases in a blockwork wall? As in the photo on the right of this webpage.
    http://www.passivehousesystems.co.uk/product/blowerproof/
    • CommentAuthortony
    • CommentTimeJan 8th 2017
     
    I would very much doubt it!!

    A few on here might have, no need if you wet plaster though.
    • CommentAuthorDonkey
    • CommentTimeJan 8th 2017
     
    Thanks Tony, do you use wet plaster on the chase before fitting the protective cable channel? Other option is to use conduit in the chase which wouldn't need any sealing before fitting.
    • CommentAuthortony
    • CommentTimeJan 8th 2017
     
    No, I seal the ends of the channel with acrylic sealant, only parge behind the boxes
    •  
      CommentAuthordjh
    • CommentTimeJan 9th 2017
     
    It's an interesting looking product as an alternative to taping junctions. The description seems a bit vague as to just what the 'polymer' is and how flexible it is for how long. How much does it cost? It might be worth getting a sample to test.
    • CommentAuthorDonkey
    • CommentTimeJan 9th 2017
     
    http://www.ecomerchant.co.uk/liquid-blowerproof-brush-paint-on-airtight-sealing-membrane-5kg.html

    Product Name Price Qty Subtotal
    Subtotal £49.99
    Shipping & Handling (Ecomerchant - Courier) £15.00
    Tax £13.00
    Grand Total £77.99

    How is that comparing with sealing tape? Coverage they say is "One 5kg tub will cover approximately 83 linear metres at 75mm wide."
    • CommentAuthorringi
    • CommentTimeJan 9th 2017
     
    I think it sicks a lot better to concrete and bricks than tape does.
    • CommentAuthorgravelld
    • CommentTimeJan 9th 2017
     
    I think ecomerchant used to sell this as 'airtight paint' in case anyone else does a search.
    •  
      CommentAuthordjh
    • CommentTimeJan 10th 2017
     
    Posted By: ringiI think it sicks a lot better to concrete and bricks than tape does.

    If you're using tape with bricks or concrete, you need to use the primer on the surfaces first. It dries to a tacky latex-like feel that the tape sticks well to.

    Or of course if you're plastering the surface, you could use a plaster-in tape.

    The price sounds about the same order as Tescon.
    • CommentAuthorTimSmall
    • CommentTimeJul 19th 2017
     
    Got the dregs of a tub of this from a friend. I think it's mainly SBR (around £20 for a 5 litre container typically), the smell is identical. It has some fibres in it, which seem to melt readily so I suspect are polypropylene or similar (used for screeding, I had half a bag in the shed to compare with). The MSDS also says it contains aluminium hydroxide.

    I found this research paper abstract - https://www.researchgate.net/publication/229537123_Decabromobiphenyl_oxide-aluminum_hydroxide_system_as_a_flame_retardant_for_styrene-butadiene_rubber - where it was investigated as a flame retardant, but also had the effect of making SBR more flexible. Another patent online describes car tyres with sbr and aluminium hydroxide, so I assume its long term stability is fine.

    The MSDS also mentions 5-chloro-2-methyl-4-isothiazolin-3-one - which seems to be an antibacterial / antifungal, and is used in some other SBR products (it shows up in their MSDS too).

    I've ordered some aluminium hydroxide, so will try mixing something up when it arrives and report back.
    •  
      CommentAuthorfostertom
    • CommentTimeJul 20th 2017
     
    Mixtures like that - GCHQ's listening!
    • CommentAuthorMike1
    • CommentTimeJul 20th 2017
     
    IGuess you could use something like brush-applied Aquaseal - flexible and waterproof, so also airtight...
    • CommentAuthorTimSmall
    • CommentTimeJul 25th 2017
     
    Seems to work OK, and behave approximately the same as the blue-black end-of-tub which I used to do a quick test patch with to compare.

    I also added in some decorators acrylic caulk to thicken it (that was a bit of a guess, but the blowerproof liquid instructions say "any brush suitable for acrylic paints"), and it seemed to more or less do the trick.

    Cost probably around £15 for 6kg if you're doing it in reasonable quantities. Rises to about £30 as a one-off (I had most of the ingredients surplus anyway, so was about £10 for me as a one-off.
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