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I live on the top floor of my building and damp patches appear on the ceiling after heavy rain. How do I repair or reseal the roof-top?
f safe, get up on the roof and check for any cracked or damaged areas where water could be getting in or concave areas where water is building up. If you're fortunate enough to isolate areas that correspond with the damp patch! Ifindoors, remove the damaged surface with a scraper or wire brush and allow the arc to dry out comptetely before patching it.
If the roof surface is concrete you can use quick dry cement ($25 per kilogram) which comes in powder form that you mix with water. It dries very quickly, even in damp conditions, so make sure the surface is clean and ready to be patched up before you begin. If the roof is topped with a bitumen Layer you can match up with black bitumen emulsion ($340 per 20 litres).
If you can't find the source of the problem, you coutd try coatng the entire surface with Kangaroo Waterproofing Membrane, available in grey or white.
To avoid a sore back, apply with a roller attached to an extension pole. All materials available from Yuen Fat Ho tel 2546 0201.
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