Waterproofing Project Case Study & Performance

📍 Location: Kaohsiung, Taiwan
🏠 Area: Rooftop balcony of a multi-story townhouse
📐 Size: Approximately 60 ping (≈ 198 m²)
📝 Project Overview:
This is an aging townhouse with a metal canopy already installed on the rooftop. During heavy wind and rain, water seeps through the rooftop floor into the indoor space below. To prevent further leakage, a rapid waterproofing solution was required for the rooftop flooring

🧰 Tools Used

Measuring tape ruler
Face masks / gloves
Broom / dustpan
Long-handled paint roller / squeegee / paintbrush
Blower (for fast dust removal)

🧪 Materials Selected

Primer: Single-component CPU-13-C-50B
Mid-coat: Single-component shock-resistant CPU-49-WP-19J
Topcoat: Single-component non-yellowing white CPU-49-TC-10B

Material Quantities (including buffer for loss and reinforcement):

*Area Type*	Size	Primer (1 coat)	Intermediate (2 coats)	Top Coat (1 coat)
Rooftop / Floor	~33 m²	10.0 kg	100.0 kg	20.0 kg
Rooftop / Floor	~165 m²	50.0 kg	500.0 kg	100.0 kg
*Total*	~ 198m²	60.0 kg	600.0 kg	120.0 kg

🧱 Construction Steps

Measure the dimensions of the work area
Select waterproofing materials and calculate required quantities
Prepare tools and materials
Day 1: Clean the surface thoroughly
Day 1: Apply primer coat
Day 1–2: Apply mid-coats (one coat each day)
Day 3: Apply topcoat
Perform water testing: splash and ponding tests to confirm waterproofing

Pre-Construction

Step 1: Inspect rooftop floor condition and measure the area

Step 2: Calculate and purchase required materials

For dual-component coatings: refer to [TPUCO waterproofing materials compliant with CNS 8644]
For single-component coatings: consult a professional team or DIY guide [Team or DIY? Choosing the Right Waterproofing Plan]

Step 3: Prepare tools

Measuring tape ruler
Face masks / gloves
Broom / dustpan
Long-handled paint roller / squeegee / paintbrush
Blower for fast dust removal

Step 4 (Day 1): Cleaning & Surface Preparation Surface must be clean and level, free of loose sand, oil stains, or cracks to ensure proper adhesion. Moisture control: PU and polyurea coatings require low surface moisture for proper curing. Use blower for efficient dust removal


Step 5 (Day 1): Apply Primer Coat with roller


~ Wait for primer to dry ~
Step 6 (Day 1): Apply first mid-coat After primer dries, apply first mid-coat using roller and squeegee.

Step 6 (Day 2): Apply second mid-coat

Step 7 (Day 3): Apply Top Coat with roller


Step 8: Water Testing & Completion Conduct splash and ponding tests to confirm waterproofing effectiveness


Before Construction
After (30 Days)