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      CommentAuthorfostertom
    • CommentTimeApr 15th 2017
     
    Posted By: lineweightdifferent types of brick (and mortar) can show different behaviours. And the type of brick may not even be the same throughout the wall
    True, if WUFI's expected to be reliable. On big posh schemes they take brick sample(s) and test their charcteristics, at considerable cost. The rest of us have to make best educated guess!

    Just as the cost of DNA analysis has crashed from megabucks to pennies, perhaps same for the above testing?!

    I'm beginning to think of simple 'hands-on' tests that can help with this, at least to suggest relative (not quantified/numbers) characteristics - the simplest example being a 'suck test' on a potential airtight membrane - subjectively comparing e.g. polythene with breather membrane with OSB. Other ingenious suggestions welcome!
    • CommentAuthorlineweight
    • CommentTimeApr 15th 2017
     
    I'm considering aiming a hose at a portion of my wall where I know there's a sensor behind. Get it really saturated. And then see if I can detect anything happening at the sensor during the following hours/days.
    • CommentAuthortony
    • CommentTimeApr 15th 2017
     
    Good idea, I reckon nothing will happen that wasn't going to happen anyway
    •  
      CommentAuthorfostertom
    • CommentTimeApr 15th 2017
     
    Another thing you can do in WUFI is to try the two extreme possibilities for unknown (say brickwork absorbtivity) characteristics - 'bracketing'. You never know, you may find you're in the clear even with the worst case, or you'll see how close it is to which end of the range, that problems appear.
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