Cadw, a Welsh heritage organisation, needed a specialist cleaning service and sympathetic sandstone cleaning to remove graffiti from Newport Castle without causing damage to the fragile substrate and surface of the stone. The castle had been attacked by graffiti in several areas, including the Kings Chamber, and required a solution urgently to prevent further vandalism and restore the building’s former appearance.
APT’s surveyor met with Richard Turner, the senior conservation officer of Cadw, to discuss their proposal and methodology for removing the graffiti and sandstone cleaning. They conducted a full assessment of the natural stonework, analysing the vulnerabilities of the façade, as some of the stonework was fragile with areas of limewash crumbling away. It was crucial to remove the graffiti without harming the substrate material, and soda blasting was the chosen method.
Our specialist soda blasting service presented an unusual challenge when removing graffiti from the cellars, as the estuary would often rise and cause the cellar to flood. The team had to protect the blasting pot, ensuring it remained dry from moisture when cleaning Indian sandstone.
APT used their innovative, specialist soda blasting system and industry-trained, accredited technicians to remove the offensive graffiti sensitively and also conduct the sandstone cleaning. The soda blasting method effectively removed the graffiti without causing damage to the sandstone substrate.
We never use harsh chemicals, cleaning products, pressure (power) washing, acid based chemicals and bleach solutions for cleaning natural stone. It’s essential that we do not pressure washer surfaces which could damage the surfaces whether it be a sandstone patio or sandstone paving.
The outcome of the graffiti removal and sandstone cleaners at Newport Castle was successful, with us safely removing all graffiti from the façades without causing any damage to the fragile substrate. The result was impressive, with Richard Turner and his team at Cadw so impressed with our capabilities that they granted the company authority to be used on Cadw sites throughout Wales as and when required.
If you are looking for graffiti removal or sandstone cleaning in Newport, Cardiff, Swansea, Bristol, or any other area, our friendly team can advise on the most appropriate method for removing graffiti, cleaning moss and algae and cleaning sandstone.