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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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    • CommentAuthormaxelaine
    • CommentTime7 days ago
     
    As inexperienced part-DIY builders, we thought we could cope with getting it airtight, where attention to detail and not worrying about time would be rewarded.

    We went with SIGA products, had the rep around to talk us through it and help develop a buying list, spent, from memory, about £1,500 on membrane, tape and mastic.

    It's all gone very well so far - we're 4 days in and about half way. The products are all superb, the tape sticks, the membrane is tough, easy to handle, translucent, so you can see the joists or marks through it. The design of the various tapes, with strategic folds and split backing paper make them easy to fix.

    All in all, we're confident of getting really good airtightness - there are still a few issues to sort - like sealing around electrical boxes, but we'll find the answer.
    • CommentAuthorgravelld
    • CommentTime7 days ago
     
    Thanks for the report - what surfaces/substrates are you using the tape and mastic on? Also come back with your result :wink:
    • CommentAuthormaxelaine
    • CommentTime7 days ago
     
    Porotherm blocks and wooden joists. Will do!
    •  
      CommentAuthordjh
    • CommentTime7 days ago
     
    Posted By: maxelaineIt's all gone very well so far - we're 4 days in and about half way.

    Congratulations. It sounds like you had a good approach.

    there are still a few issues to sort - like sealing around electrical boxes

    Start with backboxes designed to be airtight, if you can, or a flexible liner such as Instaabox or homemade equivalent. Otherwise just use lots of short pieces of Rissan until there are no holes! And/or fill with Primur.
    • CommentAuthormaxelaine
    • CommentTime7 days ago
     
    The (standard) back boxes are in - usually in over-sized holes that expose the inner chambers of the porotherm. I guess Primur through a gun, including the holes inside the boxes.
    •  
      CommentAuthordjh
    • CommentTime7 days ago
     
    Posted By: maxelaineThe (standard) back boxes are in - usually in over-sized holes that expose the inner chambers of the porotherm. I guess Primur through a gun, including the holes inside the boxes.

    Ah, then maybe I would try squirting something like Illbruck FM330 or Soudal Airtight Flexi Foam into the void behind the back box to see if that made it airtight. If not, you could always fall back to the Rissan/Primur plan.
    • CommentAuthorgravelld
    • CommentTime7 days ago
     
    Posted By: djhSoudal Airtight Flexi Foam
    You mean normal Flexi Foam or is this a separate thing? A Google search just showed up normal FF and something else called "Window & Door SWS".
  1.  
    Posted By: gravelldYou mean normal Flexi Foam or is this a separate thing? A Google search just showed up normal FF and something else called "Window & Door SWS".


    I used Soudal Window & Door SWS which was very easy to use as it has minimal expansion.
    • CommentAuthorgravelld
    • CommentTime7 days ago
     
    FF is pretty good too, gun grade obvs. I also found a cheaper foam by Everbuild called Thermofoam which is squishy too but I don't know how the two compare technically.
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