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Roofers in Colombo work on flat concrete slabs as often as pitched roofs, and slab waterproofing failures are among the most common calls in the city's apartment and townhouse stock.
On a flat slab, the problem is nearly always ponding: water standing where the fall is inadequate finds every weakness in the membrane. Have the falls and outlets checked before paying for another coat of waterproofing over the same defect.
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Frequently asked questions
Questions about finding a tradesperson in Colombo? Here are the answers homeowners ask most.
Usually inadequate fall, blocked outlets, or a failed membrane at the upstand where the slab meets a parapet. Recoating without correcting the fall gives you the same leak in a different place a year later.
It varies with area and system, and should be quoted after an inspection at Rs 3,500 to Rs 8,000 rather than over the phone. Insist the quote covers preparation and upstands, not just the flat area.
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Indicative 2026 rates for Colombo and the suburbs, based on Snapwerks quotes and published Sri Lankan market data. Outstation districts usually run 10-20% lower on labour. Expect the top of each range during the Avurudu rush in March and April and at the start of the monsoon. Always get the scope and the price in writing before work starts.
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