Limestone Drive

benz

After more than 20 years, the time has come for maintenance on my limestone drive. The slabs are irregular and between 1 and 2 inches thick. It's been cleaned but needs re-pointing. Some of the gaps between the slabs are the size of your fist and others are hairline cracks.

What do I use for re-pointing?

One or two of the bigger slabs move very slightly when the edges are walked on, (give slightly). Is it good enough to try and force a little extra sand around these edges or do they need to be lifted and rebedded?

While researching the above on this website, I noted that sealant treatment is mentioned for 'Indian' limestone. I've no idea whether my limestone is 'Indian' or not, but is it a good idea?

bobhawke

If some of the gaps are fist sized and you are planning on repointing that then anything other than building sand, cement and plasticiser could cost a fortune.

Better if the slabs are lifted but forcing some sand in and repointing will stop any movement.

ormus

the bad ones really need to be lifted and some sharp sand added first.
if there are some fist sized holes i would swap some slabs around so to put the bad edges at the far side or end.
for pointing, some sand/cement mortar will be ok. say a 4-1 mix. for strength.