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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.
    • 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
    • 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

    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.
    • 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.
    • 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.
    • CommentAuthordelprado
    • CommentTimeFeb 22nd 2018
    Hi all, does anyone else have any comments on this product? Thinking about using it myself as it looks very useful

    • CommentAuthorrevor
    • CommentTimeFeb 22nd 2018
    Looks a very useful product does anyone know if it also can act as a dpc no mention of this and would it stick to DPM like visqueen?
    Gervase, formerly of this forum writes:

    We ended up using blowerproof all over the place (on an EnerPHit refurb) and in many situations it really is a lot easier and probably less expensive than tape.

    We did use in chases and it seemed to work very well when tested with only a couple of tiny leaks. The logic behind using it there was that whilst the wet plaster will cover the chase you can be left with air path into cable exit/entry points.

    We also used it around joist ends in conjunction with a non-shrink grout. MUCH easier than tape and certainly effective.

    Be aware it is very sensitive to temperature and moisture content of substrate in going off. In some cases the first coat took several days to go off.

    I’d certainly use it again.
    • CommentAuthorTimSmall
    • CommentTimeFeb 23rd 2018
    My home brew version also seems to work well, have done some testing of it in-situ. Certainly useful for tricky joints / details - particularly with masonry.
    • CommentAuthorgravelld
    • CommentTimeFeb 24th 2018
    This is interesting; just recently I've been wondering about covering the entire house in this stuff (using existing render as air barrier then EWI over the top), simply because I don't trust S+C parge coats (with joins, different ages etc) for long term airtightness.

    You can get it in spray form; even so I can imagine it would be expensive.
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