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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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    • CommentAuthorsnyggapa
    • CommentTimeJan 12th 2018
    Well, I guess "help" doesn't even begin to describe it... I have seen many times that "WUFI is the answer" but I barely know the question, never mind how to start asking it!

    We have a late 1800/early 1900 terrace on the North Devon coast that is being renovated. Walls are for the most part 450mm thick stone (presumed solid and probably local slate) although there are various thinner parts made of brick where there is a bay window.

    I attach a pic from the inside to provide some context where we have removed the previous attempt at hiding the damp problem by installing a plasterboard stud wall inside the external wall.. It didn't work for long. Outside is of course our old friend a cement render.

    So having hacked off the inside and about to hack off the outside, we are looking at options to render the outside and cover the inside. Lime would be the simple choice but it would seem to make sense to look at the "insulated limes" such as diathonite or ecocork or the cement/lime types such as bauwer lite.

    So my thoughts are along the lines that external render (and this is restricted by the neighbours render thickness to all practical extents) is about 25mm. Internally, we have the thickness of the removed stud wall to take up which is about 100mm.

    So my thoughts turn to whether it is sensible to insulate both inside and outside, but am wary of condensation risk within the wall. (And then a secondary query as to whether it is a problem if both inside and outside are breathable)

    I know the insulated renders are "expensive" but in the overall scheme of things, the materials are not the dominant cost, but I don't want to create myself a problem in future. Is there anyone that could work me through the steps to understand condensation, how to model it, how to avoid mistakes that would be much appreciated. I understand the physics in general terms, but need to be walked through the details and the software!

    Any help or thoughts are appreciated


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