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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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Building Regulations and Standards: air tightness of aerosol foam

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  1.  
    • CommentAuthorRobinB
    • CommentTimeApr 6th 2010 edited
     
    Our house has so much squirty foam sealing round windows and at the eaves I'm starting to wonder if it will all blow out/get sucked in when we do the airtightness test. I'm very pleased we've reduced opportunities for thermal bridging but is there a sensible limit?
  2.  
    Don't worry - airtightness testing customarily uses 50Pa of pressure difference - that might be hard to visualize, but google handily coverts this thus:

    50 pascals = 0.00725188689 pounds per square inch

    Work out the area of your foam and you'll see the pressure is minuscule.

    Paul in Montreal.
    • CommentAuthorRobinB
    • CommentTimeApr 7th 2010
     
    Oh good, thanks Paul!
    •  
      CommentAuthorDamonHD
    • CommentTimeApr 7th 2010
     
    I was told the 50Pa over/under pressure is only like leaving your front door open in a strong wind...

    Didn't even blow cobwebs out of some of my unplanned vents!

    Rgds

    Damon
    • CommentAuthorRobinB
    • CommentTimeApr 13th 2010
     
    I'd been expecting much more than that!

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