This client had recently had a black limestone tiled floor installed in the kitchen and dining area in his home on the northern border of Warwickshire. Unfortunately however the tiler had not sealed the tiles prior and struggled to remove the grout smears from the Limestone surface. The tiles were then sealed trapping the grout haze under the sealer; naturally the client was far from happy and was instructed to remove the grout using an acid wash.
The acid things turned the floor grey removing the oils in the floor from the factory and also caused the natural salts within the tile to rise to the surface. The tiles were then sealed with an external patio sealant without removing the existing surface sealer. All this compounded the problems in the floor causing it to mark easily and lose its colour; on top of that it had big cloudy white patches all over from the trapped salts.
Stripping sealer from a Limestone Floor Tiles
To resolve the problems with the floor it had to be fully stripped back and cleaned of all sealants and salt etc. which was done by applying a solution of Tile Doctor Remove and Go combined with Nanotech UltraClean mopped on to the floor in two square metres at a time. The solution was allowed to soak into the floor for thirty minutes to allow the chemicals break down and then scrubbed using a rotary machine fitted with a black pad. The soiled solution was then extracted from the floor using a wet vacuum. This process was repeated across the entire floor until all the sealer had been removed.
Removing Salts from Limestone Tiles
To remove the salts and remaining grout haze the floor was treated with Grout Clean-up which is an acid based cleaning product that is designed to penetrate below the surface and remove light grout smears (grout haze) as well as mineral deposits such as salts and efflorescence, again this treatment was applied two square meters at a time, quickly worked into the floor and removed with the wet vacuum. Once this process was complete the whole floor was washed at high pressure rinse three times to ensure all trace of chemicals had been removed.
The floor was left to dry and when we came back the second day it was noticed that there were still some salts coming through to the surface of the Limestone, these areas were re-treated and the floor washed down again and left to dry as before.
Sealing Limestone Floor Tiles
The floor looked much improved on the third day although it was still looking washed out. To put the colour back into the black limestone it was treated with stone oil with turns the floor back to black and then sealed with two coats of Tile Doctor Colour Grow which will protect the tile going forward.
The floor now looks how it was intended and certainly the customer was pleased and left the following comment on our feedback system.
“We are so pleased with the work carried out by the tile doctor to our kitchen, utility and family room. The floor now looks exactly how we hoped it would look when we originally purchased it. We’ve struggled to get it looking right since then and now we feel we finally have a floor we can enjoy at last! We also found Mick to be professional and highly knowledgeable on our floor. He has given us really good advice and has been really easy to contact and has also been happy to give us further help and advice over the phone even when the job’s been completed. L. Nash”
Source: Resolving Limestone tile installation problems in Warwickshire