Roof Waterproofing Specialist Works in Singapore Topic Key Takeaways Cost SGD 1,000 – 3,000 per m² (average) Common Systems Bitumen‑based, Liquid membranes, Polyurethane, Cementitious coatings Best Pick (for most roofs) Liquid‑applied waterproofing (e.g., Sika‑WaterGuard, Eco‑K) Choosing a Pro Credentials, past work, warranty, after‑care, and pricing transparency 1. What Does a Roof Waterproofing Job Cost in Singapore? Roof Type Size Typical Cost per m² Total (est.) Flat residential (single unit) 30 m²