Flat Roof Waterproofing Malaysia: Best Methods & Materials

Why Flat Roofs Leak More Than Pitched Roofs

Flat roofs hold water. Unlike pitched roofs that shed water quickly, flat roofs allow water to pond, creating constant hydrostatic pressure on the waterproofing membrane.

Best Flat Roof Waterproofing Methods

Method 1: Torch-Applied Bituminous Membrane

Gold standard for flat roofs

SBS modified bitumen for tropical flexibility

Apply with heat torch for seamless joints

Cost: RM12–18/sqft | Lifespan: 15–20 years

Method 2: Liquid Polyurethane Membrane

Seamless liquid application

Conforms to complex roof shapes

Excellent UV resistance

Cost: RM10–15/sqft | Lifespan: 10–15 years

Method 3: EPDM Rubber Membrane

Single-ply rubber sheet

Fast installation

Good for large commercial roofs

Cost: RM15–22/sqft | Lifespan: 20–25 years

Common Flat Roof Waterproofing Mistakes

1. Not creating proper falls for drainage

2. Using interior waterproofing products on exposed roofs

3. Insufficient overlap at membrane joints

4. Skipping primer on concrete surface

5. Not protecting membrane edges at parapets

AquaShield specializes in flat roof waterproofing. Contact us for a free assessment.