To Patch or Not To Patch? Mortar Repair on Stone

Although I am a devout traditionalist and prefer to keep the use of portland cements to a minimum, the patching process of mortar repair, when dealing with natural stone buildings, should allow for a strong and durable patch. All patching and pointing shall be installed utilising soaking methods; working with optimal moisture content in both substrate and mortar. This basically means that substrates remain dampened before and after pointing/ patching has occurred.

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Bluestone cottage wall with joint removed. The three smaller stones, known as ‘bees feet’, used to fill the line, can be filled with darker mortar

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Bluestone Cottage wall with darkened mortar patch

While the colour may look darker now, the patch will dry lighter to match the colour of the surrounding stone. The skill of the original mason from many years ago has been highlighted again by this restoration.

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Turning random rubble into a dressed 300mm ashlar wall–Victorian Bluestone Georgian Cottage

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