Removing Grout Haze from Commercial Terrazzo Flooring with Tile Doctor Burnishing Pads at a Cinema in Twickenham Middlesex

Cleaning a Terrazzo Tiled Cinema Hallway

Late last year I was asked to renovate 1000m2 of Terrazzo tiles in the public spaces of a Cinema in Twickenham . It sounded like a dream job however the complication was the work could only be done out of hours, and I would need to start at 5am and be gone before they opened for business at 11:00.

The Terrazzo tiles had been regularly cleaned however the sealer had worn down with all the foot traffic they had received, and this resulted in dirt becoming ingrained in the tile leaving them extremely dirty. Another issue was that the installer had not managed to polish off all the grout during installation and so the tiles had grout haze staining over the surface which detracted from their appearance and resulted in a rough texture that trapped dirt easily.

To resolve all the issues the Terrazzo needed to be burnished with diamond pads to remove the grout haze and bring up their appearance. Once that had been done, they would need to be sealed to prevent dirt from becoming ingrained in the pores of the tile, this would also make them easier to keep clean. Due to the sheer size of the project, I had calculated the work would take approximately six weeks in total however due to the restrictions and other complications it would need to be done over a six-month period. The manager of the cinema didn’t want the operation of the cinema impacted by the cleaning so was happy to agree to the plan.

To complete this floor, I worked in small sections using an industrial Victor Trojan buffing machine and Tile Doctors diamond pad diamond burnishing system. I found the first 400-grit pad which was applied using only water immediately took off the dirt and grout haze from the terrazzo leaving the tile with a nice smooth face. This process generates a lot of soiling which is contained in the water turning it into a fine slurry which was then removed using a wet vacuum.

After this the 400-grit pad was switched to a finer 800-grit pad which is the first step in repolishing the tiles as well as taking off any areas of dirt missed earlier. The pad is run over the floor as before with water for lubrication and once done the soiled liquid was extracted again. Next up was the 1500-grit pad being a lighter pad used to give the tile a last wet polish before you move on to sealing and dry polishing.

Once the 1500 pad was completed, the floor was given a rinse with water and the now clean section of flooring dried as much as possible with the wet vacuum. The tiles were then left to dry with a hot air floor blower in place to speed up drying the floor.

Sealing a Terrazzo Tiled Cinema Hallway Floor

It wasn’t long before the tiles were dry and ready for sealing with an application of Tile Doctor Ultra-Seal which is a natural look impregnator that soaks into the tile and protects without changing its appearance. The sealer was rubbed in by hand with a micro fibre cloth making sure to remove any excess. Two coats were applied with a thirty-minute dry time in-between coats.

Once the sealer had dried the floor was burnished again, this time a very fine 3500-grit burnishing pad. Only a little water is applied when using this pad, dry polishing the tiles with a left right then circular movement. This works the sealer into the tiles, closes the pores and gives the tile a smooth, non-slip wipeable surface that will be difficult for dirt to penetrate in the future.

Once complete the grout haze was gone and the Terrazzo looked great with a deep shine. My client was extremely happy with the transformation and said it looked like a new floor.

The section of hallway in the photographs took four mornings to complete but it was the tip of the iceberg really with a lot more floor to do before the job would be finished.

For the aftercare of Polished Terrazzo, I recommend the use of Tile Doctor Stone Soap which is a ph neutral floor cleaner that contains a patina enhancer that will help maintain the appearance of the tiles without impacting the sealer.

Source: Professional Commercial Terrazzo Floor Renovation Service near Twickenham in Middlesex