Waterproofing in Kowloon City

A common trap is a 'free survey' that always diagnoses rising damp and sells a chemical damp-proof course, when the real cause is condensation, a leaking gutter or bridged damp course. Get an independent, qualified diagnosis before paying for injected chemicals.

In Kowloon City, look for a specialist who diagnoses the water source before quoting, proposes a system matched to it, offers an insurance-backed guarantee, and shows relevant qualifications. Avoid one-size-fits-all chemical-injection sales pitches.

Wet areas need a waterproof membrane behind tiles on floors and walls, correctly detailed at junctions and drains. In many countries this is regulated work with a standard to meet — a failed shower membrane is one of the most common and costly building defects.

It depends on the method and area. Internal sealants and damp-proofing for a small area are the cheapest option; cavity-drain membranes and tanking cost more; a full basement or below-ground waterproofing system is the most expensive, running into five figures. The cause of the water dictates the right system.

A properly installed cavity-drain or tanking system can last decades, and quality membranes carry long guarantees. Cheap surface coatings applied over an unaddressed water problem fail fast. Longevity depends on correct diagnosis and installation far more than the product.

A bathroom or small sealant job typically runs HKD 3,000-15,000, roof or membrane systems HKD 12,000-55,000, and full structural waterproofing HKD 40,000-160,000.