I was recently asked to this property in Wimbledon in to see if there was anything we could do to resolve the problem with a recently laid Black Limestone tiled floor. The builders that had laid the Limestone did not cover or clean the tiles prior to sealing with an impregnating seal thereby trapping in all the dirt from the building works. They then grouted the tiles but didn’t clean the grout off the surface before putting on another two coats of sealer all of which resulted in a very poor finish.
Stripping the Limestone Tiled Floor
To resolve I tried all the sealant strippers available to me but couldn’t budge the mess effectively. The only other option available was to diamond grind the surface so I discussed this with the customer and she agreed to this and left me to carry on.
Initially I started with a coarse 400 grit diamond pad but even that wasn’t having much effect so in the end I had to cut back the surface using a 100 grit pad moving up to 200 grit, then 400 before finally stopping at 800. To lubricate the process you need to use a little water and then rinse away the resultant soil after each pad. If this was a polished stone surface I would have continued with finer and finer grits to restore the surface polish however these tiles were rough limestone and I needed to leave it as near to how it should be.
Sealing Black Limestone Tiles
I left the floor overnight to allow the Stone Oil to dry out and then returned to seal the Limestone using two coats of Tile Doctor Colour Grow which is an impregnating sealer that enhances the colour in the stone and will protect it from staining going forward.