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Last edited 18 Nov 2020
Durability Guaranteed - Pulhamite Rockwork - Its conservation and repair, published by Historic England in 2008, defines keying as: ‘The preparation of a surface to ensure that a render or mortar adheres securely to it, for example by raking out old joints or cracks prior to pointing or by applying a thin, strong, coarse mix (stipple, spatter or spatterdash coat) to otherwise smooth brickwork prior to rendering.’
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