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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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Energy Assessment: Air tightness and thermal checks

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    • CommentAuthorarnyj
    • CommentTimeJul 22nd 2011
     
    I'm seriously looking into having a Air tightness test done. I see from the BSRIA website it costs £230.

    will it tell me where the air is leaving the house with the aid of some form of dye so that I can go around and seal up holes.

    Am currently installing internal insulation "sheeps wool /cotton waste" covering with blue sheets and pro-clima tape.

    after having test intend to install MVHR system I'm also hope-ing they will tell me the house is tight enough for it to work properly.

    Will they make that type of statement?

    Am I right to think BSRIA will send someone who lives near me to do job.

    can't think of anything else.

    thanks Arnyj in chester
    • CommentAuthoranglia
    • CommentTimeJul 22nd 2011
     
    They will be able to show you any leakage paths by localised smoke testing once the house is under pressure.
    The test result will be expressed as M3/hr/M2@50pa which is cubic metres per hour measured against the envelope area of the building at 50 pascals pressure. They should also be able to tell you the ACH, air changes per hour, which is measured against the volume of the building. For MVHR to work efficiently the air leakage needs to be very low preferably no more than 1-2 M3/hr/M2@50pa. I believe BSRIA have test engineers around the country.
    • CommentAuthortony
    • CommentTimeJul 22nd 2011
     
    Most sub contractors even from good sources will likely be in a hurry, and keen to get away to his next job and not fiddle about, you can pay extra for leak finding time though, probably in the small print

    you could do better to find your own local tester and ideally a nice one who will assist you tracking leaks and do as a part of the job

    MHRV will probably work OK if you are installing a joined up barrier
    • CommentAuthorRobinB
    • CommentTimeJul 25th 2011
     
    I used Stroma, they helpfully called around a couple of months before the test with advice (the guy was local to us). When they did the test they lent me a smoke puffer so I could go around the house while it was pressurised/depressurised and find the leaks myself. I probably should have paid to have a bit longer but I was able to fix a few obvious things and reduce the final recorded airtighness score to well below our targe. Cost similar to arnyj's BSRIA.
    • CommentAuthordickster
    • CommentTimeJul 25th 2011
     
    We've not been pressure tested yet, but re finding leaks:

    Use a jostick and get someone to slam shut/open quickly a relevant door. Works a treat.

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