This heritage contract was carried out during weekend possessions. Typical of flooring installations from the early 1930s, the floor contained a high percentage of traditional in-situ terrazzo. There was extensive cracking, and areas failing due to heavy wear and lack of regular maintenance. Much of the in-situ required replacement, which we carried out with the approval of London Heritage.
We were pleased to provide a number of samples for Heritage consideration. Once these were approved and accepted, samples were cast and tested for slip characteristics.
Heritage & HSE
There was scant regard for particularly safe installation practices in the 1930s, or the slip potential of the finished floor. The task of providing a new, sealed, safe, old-looking "new" In-Situ floor was challenging, but eventually succeeded.
Prepare for New Terrazzo
The existing terrazzo was suffering from extensive cracking and degradation and several panels required replacement. Our team carefully removed the failing terrazzo, whilst retaining the existing metal divider strips in the floor. We thoroughlly cleaned the area and applied a bonding slurry before screeding.
We applied a fibre and polymer reinforced sand & cement screed to the base of new in-situ panels. This was plastic floated to leave a light texture ready to recieve the in-situ topping.
Installing Yellow In-Situ
In-Situ was hand mixed and gauged to maintain colour consistency. Some of the full bays replaced needed an overall depth of around 75mm (including screed.) Borders were also replaced.
Installing Red In-Situ
Aggregates for the red sections were sourced from abroad.
Grinding & Polishing
Wear and tear had taken their toll over the years. Pit-holing was quite extensive, and shortly prior to final grinding, pit-holes were cleaned out and grouted up with a colour-matched cementitious grout.
A final clean-up before sealing.
Once the floor had dried out a generous coat of penetrative anti -slip sealer was applied as a finishing coat. After a minimal curing period, the station was re-opened.
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