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How to identify the source of dampness?Damp walls feel cold to the touch; it also causes the flaking of paint and bubbling of wallpaper. Additionally, mould and fungal growth form greenish-grey spots on the walls. Such wall dampness is caused by constant water leakage, maybe from the roof, leaking water tanks, or seepage in exterior walls.Water may seep from constant leakage from a tank or water collected on the roof or upper floor through the ceiling to cause discolouration in paint or create visible brown patches in the ceiling. Areas like bathrooms, basements, store rooms, attics or closed garages are usually not well ventilated and a source of condensation dampness. A strong musty smell within these areas is a clear indication of dampness. Check the tile grout in moisture-laden areas like bathrooms and kitchens for any kind of mould growth. The mould shows the grouting’s waterproofing is compromised and might let water seep into the floor or walls.Black mould may develop around the frames of wooden and uPVC windows due to water seepage through gaps between the window frame and the wall.