Roof Waterproofing in Singapore

It comes down to the substrate, whether it moves, whether the surface is exposed to UV or covered, whether it will be walked on, and how long water sits on it after rain. Torch-on membrane suits large open flat roofs; liquid-applied suits complex shapes with many penetrations. If a quotation just says "waterproofing" with a price and no named system, you do not yet have enough information to compare it against anything.

Membrane failure is the leading cause of recurring repair work in Singapore buildings, and it almost always starts at the details rather than the middle of a flat surface, laps, upstands, drain outlets and pipe penetrations. Exposed membrane left without its protective covering also degrades far faster under Singapore UV than the datasheet suggests. We look at where yours failed before quoting to redo it.

Yes, in writing. The term depends on the system and the substrate, and it is stated on your quotation before you commit, not promised verbally and forgotten afterwards.

Yes. A water ponding test is the only way to demonstrate the system holds before it is covered up. It is part of the programme, not an extra.

Curing between coats is the constraint, not application time. Most roof work runs three to seven days including cure and the ponding test, plus weather allowance. Rushing the cure is one of the most common causes of early failure.