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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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    • CommentAuthorRex
    • CommentTimeJul 4th 2018
    What ho one and all,

    A neighbour built their modern house, very soon after I had finished mine.

    His house is a SIP construction with external battens to provide an air gap, and much to my surprise, a thin render applied over waterproof plasterboard. (In my mind, waterproof and plasterboard do not go together, but what do I know?)

    Chatting with him yesterday, he pointed out a crack on 140 degree mitre of two sheets of plasterboard. Looks like the joint was filled with something, but one sheet is well attached while the other has moved. It seems that either the joint was not taped pre rendering, or there is no mesh scrim applied across the join to the base render.

    What would be the best way to repair and reinforce this crack?

    • CommentAuthorMarkyP
    • CommentTimeJul 6th 2018 edited
    I repaired cracks in thin coat over EWI using the reinforcement mesh as a scrim (around 150mm wide strip). A swipe of basecoat was applied over the crack, mesh scrim embedded, another tight pass of basecoat then this was feathered in with the existing wall using a sponge float. The whole wall we then re-coated with thin coat. Thin coat just cant be applied to a small area, it would look awful so the whole elevation was re-done with the finish thin coat. The cracks were the result of gaps in the original basecoat mesh left by the applicator.

    The repairs are almost invisible. The very attentive might notice a slight hump on the wall surface along the crack line when the sun shines brightly across the face at a certain time of day. The repairs have withstood the heat stress of this summer we're enjoying, elevation is in full blazing sunlight all afternoon with no cracks appearing.
    • CommentAuthorRex
    • CommentTimeJul 6th 2018
    I figure that will be his way forward. i understand about having to redo the entire wall; it will probably be impossible to blend a patch into the existing.

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