The Art Of Making Roman Cement
In 1796, the Reverend James Parker patented Roman Cement, which went on to become highly desirable for its long-term durability.
After 1824, Roman Cement declined due to the introduction of Portland Cement which, as Ordinary Portland Cement (OPC) today, is burnt at fusion temperatures, which can have adverse affects on historic buildings.
Natural Roman Cement (NRC) is now available to blend with hydrated limes for a reliable set. It has a better compatible strength with historic masonry and renders due to to the special processing of the Gault Stone and the lower kiln temperatures used.
NRC is suitable for conservation and new projects, where characteristics such as breathability, flexibility and colour are important. NRC can be blended with up to 2 parts lime and, when mixed with the right aggregate, it will produce a more flexible material with a vapour-open quality similar to air lime.
NRC has a buff colour which, unlike other cements, does not produce grey tones. NRC is also unique because it is a cement without mineral or chemical additives to control the speed of set.