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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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    • CommentAuthorcjard
    • CommentTimeFeb 11th 2015 edited
    Posted By: CWattersLow Salt helps stop them going white but doesn't seem to guarantee they won't.

    I was once told they go white because they are laid wet or worse, water becomes trapped in the frogs and slowly makes its way out carrying salts with it
    • CommentAuthorCWatters
    • CommentTimeFeb 11th 2015

    "BS EN 771-1 classifies the units into three frost resistance categories F0, F1, F2, corresponding to O, M and F in BS 39213, and they are defined as follows:

    F2 Severe exposure
    Bricks durable even when used in situations where they will be saturated and subject to repeated freezing and
    thawing – equivalent to the level of frost resistance achieved by the previous “frost resistant bricks” (F) in
    BS 39213."
    • CommentAuthorMike George
    • CommentTimeFeb 11th 2015 edited
    If the area is classed as severely exposed then I would check with Building Control as to whether they will allow you to use full -fill. Many retrofitted cavity fills are now having to be removed as they were installed in zone 4 areas. This document gives a map and discusses different approaches. From Kingspan so possibly biased - nevertheless the concerns regarding rain penetration accurate and very real http://blog.kingspaninsulation.co.uk/exposure-zones-cavity-wall-insulation-residual-cavities/
    • CommentAuthorCWatters
    • CommentTimeFeb 11th 2015
    <blockquote>I was once told they go white because they are laid wet or worse, water becomes trapped in the frogs and slowly makes its way out carrying salts with it </bockquote>

    Indeed. It's quite common for brick layers to spray water on bricks but there seems to be a fine line between wet enough and too wet..

    • CommentTimeFeb 12th 2015
    It looks like i will have to talk to building control, I can do this during the garage build soon. Has anyone done partial fill with mineral wool batts and how do you maintain the gap???? (is it possible). Plan b may be that we have to have a rendered finish because of local planning policy within the area. Is full fill still a problem with a rendered finish?
    I've heard rockwool do a partial fill with batts - though for me rigid is the way to go as there is no risk whatsoever of it slumping should it get damp....

    Very close supervision of bricklayers required to ensure the insulation is nice and tight, flat, and taped so that there is no thermal bypass
    • CommentTimeFeb 13th 2015
    I had planned to install the insulation myself therefore breathing down the bricklayers necks !!!!. Would be good to know if a rendered wall is the same, i.e. still needs a clear void in this situation?
    Unfortunately the guidance is based primarily on the geographic location rather than any particular outboard finish (though a rainproof cladding of some kind would be different) , so if you are in Zone 4 then you need to consider the risk carefully and check with BCO what they will allow.
    • CommentAuthorwoodgnome
    • CommentTimeFeb 13th 2015
    BC were ok with full fill for a rendered finish here, but not sure about brick.
    My batts had BBA approval for all exposure zones. I have laid a 100mm batt face down in a puddle and water didnt penetrate more than about 20mm.
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