Concrete cancer in Manchester PRC Houses is a cooloquail name for the deterioration of concrete caused by the presence of contamininants or the action of weather. Often used in the context of the rusting of concrete reinforcement bars (rebar) found in Manchester PRC Houses, the term can equally be applied to any number of concrete failures on PRC Houses in Manchester. Concrete cancer is a layman's term, often used by the media in Manchester, but it has no specific definition recognised by building proffessionals in Manchester. It is used more often in relation to the failure of pre-cast concrete sections used in the construction of postwar Manchester non traditional housing, such as prefabs, Cornish, Myton, Parkinsons, Stent, Wates, Unity, Airey, Woolaway and Laing Easy Form.
Several forms of concrete defects can be found on Manchester PRC Houses, water penetration causes the concrete reinforcment to rust and expand which in turn causes stress on the surrounding concrete, which can then break. The use of Chloride compounds and a reduction in alkalinity can cause corrosion of the reinforcing steel bars on the Manchester PRC concrete houses. The initial cause of concrete cancer to Manchester PRC houses is water penetration.