The requirements of the contract were to clean the masonry surfaces and re-point loose and missing mortar joints. In order to remove the carbon deposits a specialist cleaning agent was required which as well as being aggressive enough to remove the carbon but not damage the masonry surfaces. The product also had to be environmentally friendly.
South West Concrete Repairs Ltd recommended a suitable product which was brush applied, scrubbed into the surface and then removed using a high pressure power washer. Up to five separate applications were required on the worst affected areas.
Loose mortar joints were removed and replaced using a sand / cement / lime mix mortar designed to match colour and texture of the original mortar joints.