1. Project Scope

This method statement describes the waterproofing application for a self-built residential house, including:

• Roof slab
• Bathrooms and toilets
• Balcony and terrace
• Kitchen wet areas
• Exterior walls (if required)

The waterproofing system will use liquid-applied membrane (PU or cementitious) unless otherwise specified.

2. Materials

• Waterproofing primer (compatible with substrate)
• Liquid waterproofing membrane (PU / acrylic / cement-based)
• Reinforcement mesh (polyester or fiberglass)
• Sealant for joints and pipe penetrations
• Protection screed (cement mortar)
• Tile adhesive (for wet areas)

All materials shall follow manufacturer recommendations.

3. Surface Preparation

1. Substrate must be firm, smooth, and fully cured (minimum 7–14 days for concrete).
2. Remove dust, loose particles, oil, and debris.
3. Repair cracks, holes, and uneven areas with repair mortar.
4. Ensure proper slope toward floor drains (minimum 1–2%).
5. Substrate must be dry before application.
6. Apply primer evenly and allow to dry.

4. Application Procedure

4.1 Roof Waterproofing

1. Apply first coat of waterproofing membrane evenly by roller or brush.
2. Install reinforcement mesh at:
   • Corners
   • Parapet joints
   • Around pipes and drains
3. Apply second coat perpendicular to the first coat after initial curing.
4. Total dry thickness: approximately 1.5–2.0 mm.
5. After full curing, apply cement protection screed (30–50 mm) if required.

4.2 Bathroom & Toilet Areas

1. Apply waterproofing to floor and extend up walls at least 300 mm high.
2. Shower area walls should be waterproofed up to 1.8 meters height.
3. Reinforce all floor-wall junctions and pipe penetrations.
4. Apply minimum two coats.
5. Conduct water ponding test for 24–48 hours before tiling.

4.3 Balcony & Terrace

1. Ensure proper drainage slope.
2. Apply two coats of waterproofing membrane.
3. Reinforce corners and door thresholds.
4. Perform 24-hour water test before finishing.

5. Inspection & Testing

• Visual inspection for uniform coverage.
• Ensure no pinholes, cracks, or missed areas.
• Conduct water ponding test for wet areas.
• Repair any leakage before finishing works.

6. Protection

• Do not allow heavy traffic before curing is complete.
• Apply protective screed before installing tiles.
• Avoid damage during construction.

7. Safety

• Workers must wear gloves and safety equipment.
• Ensure proper ventilation in enclosed spaces.
• Keep materials away from open flame.