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I have to redo the joints of a stone staircase outside, what type of mix and what are the proportions, sand, lime, cement must we make so that the joints have a good solidity and that it remains in the shades stone?

If your joints are very damaged, pick them with an electric chisel (very practical) that will save you a lot of time and save you a tedious job with the chisel. You can rent this device for the day.

Clean the joints thoroughly with a CT20 cement-type paint remover found in DIY superstores. Finally you can remake your joints lime mortar for a very bright effect (or a bastard mortar: lime + cement + sand) which you will find the proportions in our file spoil bastard mortar in the trough.

You can also take inspiration from our sheet on the restoration of exposed stone facades.

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