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Black Staining on Render: Causes & Safe Cleaning
Why Black Staining Appears on Render Black staining on render usually appears because moisture, shade and airborne contamination allow biological growth to colonise the surface. On UK properties, the most common causes are algae, cyanobacteria, mould-like organic growth, carbon soiling from pollution, dirt held in porous render and water run-off...
Red Staining on Render: Causes and Safe Removal
What Causes Red Staining on Render? Red staining on render is usually caused by one of two things: organic growth, most commonly red or orange algae, or mineral staining from iron, rust or metal run-off. On UK properties, the most common cause is biological staining from airborne algae colonising damp,...
