Posts Tagged ‘degradation’

COMMERCIAL AND INDUSTRIAL ASBESTOS ROOFS UNDERGO A BREAKDOWN PROCESS SIMILAR TO THE RUSTING OF METAL ROOFS

Asbestos roof sheets were constructed using Portland cement, reinforced with asbestos fibres.┬áThis photograph shows the extent of the degradation of asbestos roof sheets. This is caused by weathering of the roof sheet, which is then colonised by lichen. The Lichen secrete an acid called Oxalic acid, which can break down cement and even concrete. Over […]