Choosing the correct aggregate for your mix is vitally important. Primarily, aggregates should always be well graded and varied according to the joint widths. Generally, the maximum aggregate particle size should be around one third of the joint width. Particle shape also affects cohesion, and sand should be sharp. Fine builder’s sand should never be used for lime pointing.
Achieving a visual match is also essential however, particularly where old and new mortar are to co-exist, as in patch pointing. Texture as well as colour is therefore important, and for best results the aggregate of the existing mortar should be analysed and graded. We can undertake analysis of the existing lime mortar, which is invariably hidden beneath inappropriate cementitious mortar, and produce a range of sample matches, if required.
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