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Pointing a limestone slab patio. Cement or lime?


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The team are laying patios and footpaths using limestone flags. These have been laid on substantial mortar of 1 cement, 3 lime, 10 sharp sand (solid,  not dots).

 

But for pointing, would lime have any advantage over cement?

 

IMG-20230517-WA0003.jpg

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9 minutes ago, jfb said:

swears by resin 

Thanks for the link. I would prefer that the pointing was weaker than the slabs. This seems to be harder, and almost like concrete repair mix.

Thinking that through leads me to lime being better than cement. 

So you have nudged me towards lime on the swingometer, which has now been extended past cement to resin.

 

On the other hand, the slabs shouldn't move as long as water doesn't get through.

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We've got black limestone slabs and we used the resin grout system when we laid the patio 4 years ago and it's still in perfect condition.

I also give it a coat of screwfix no nonsense clear exterior sealer every year which stops the sun bleaching the colour and helps to stop water ingres.

If you drop something from the barbecue you won't end up with a greasy mark on your patio as well.

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