Knocking up
Short Guide, Lime Mortars in Traditional Buildings, published on 1 March 2013 by Historic Scotland, defines knocking up as: ‘The re-working of lime mortar that has been left for a period of time to mature. Knocking up helps regain plasticity of the mortar. The suitability of this process is dependent on the type of lime. Hydraulic limes that have begun to ‘set’ should not be knocked up as this breaks the bonds in the hydrate components, and these cannot reform – the result of which is a weak mortar.’
Short Guide: Traditional Scottish Brickwork, published, on 1 March 2014 by Historic Environment Scotland, defines knocking up as: ‘The re-working of a mortar mix to regain plasticity before use.’
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