On international duty, our MD travels to New York City.

Thomann-Hanry®’s non-abrasive cleaning system carried out in an enclosed cabinet is just what is needed to prevent water pollution while cleaning High Bridge in New York.

Stone cleaning and restoration company Thomann-Hanry®, with their ‘façade gommage®’ dry, gentle non-abrasive cleaning system that does not require scaffolding, are gaining themselves quite a reputation in America.

Having been asked to quote to clean New York’s 3,500-year-old version of London’s Cleopatra’s Needle earlier in the year using its enclosed, heavyweight cherry pickers, Thomann-Hanry® were back in New York last month (September) at the request of New York-based Schiavone Construction, a specialist in complex, heavy construction projects, to offer a solution to the cleaning of High Bridge in Harlem.

The bridge is a 15,000m2 granite aqueduct that once supplied Manhattan with drinking water. The instruction was all the more urgent because elements of the $45million dollar project had been put on hold when water runoff from the cleaning system that had started to be used was proving impossible to control. There were concerns it would contaminate the river, as well as annoying drivers using the expressway below the bridge.

Thomann-Hanry® sent a crew to conduct a feasibility study and carry out cleaning samples. Sample cleans in various locations were approved by the conservators.

Thomann-Hanry®’s proposal for containing dust while working from mast climbers above a river, expressway and rail line were also adopted. Schiavone is now moving on to larger scale trials and Thomann-Hanry® are confident this complex project will move forward successfully.

Thomann-Hanry® MD Mark Styles commented: “Once again our unique facade gommage® system has been proven and accepted as a safe and non-abrasive technique on one of the oldest and most important historical structures in NYC… (more)

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