WATERPROOFING SYSTEM SELECTION GUIDE

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1️⃣ Identify Water Source

Water Condition	Recommended System
Rainwater / Groundwater (Positive side)	Membrane system / Integral system
Internal water (Toilet, pantry, plant room)	Cementitious / PU membrane
Leakage / Seepage (Negative side)	Crystalline / Injection

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2️⃣ Substrate Type

Substrate	Suitable Waterproofing
Reinforced Concrete	Crystalline, Cementitious, PU, Sheet membrane, HDPE
Screed	PU membrane (with protection)
Metal deck	PU / Acrylic / TPO
Timber / Plywood	PU elastic membrane
Masonry / Brick	Cementitious / Crystalline

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3️⃣ Movement & Cracking Risk

Condition	System Selection
No movement (static)	Cementitious / Crystalline
Hairline cracks (<0.3mm)	Flexible cementitious / Crystalline
Active cracks / vibration	PU liquid membrane/TPO/Membrane
Expansion joints	PU membrane + joint sealant / waterstop/sealant

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4️⃣ Exposure Requirement

Exposure	Required System
UV exposed (roof, balcony)	UV-stable PU / TPO / Acrylic
Non-UV (basement, internal)	Cementitious / Crystalline
Chemical exposure (ETP, kitchen)	Epoxy / PU
Traffic (car park, podium)	PU traffic system

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5️⃣ Construction Stage

Stage	Recommended Approach
New construction	Integral crystalline + membrane
During concreting	Crystalline admixture
Post-construction	PU membrane
Repair / leakage	PU injection / Crystalline slurry

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6️⃣ Area-Based Quick Selection

Area	Recommended System
Basement slab & wall	Crystalline + external membrane
Toilet / bathroom	Cementitious or PU
Roof	PU / TPO / Acrylic
Balcony	PU membrane + screed protection
Podium deck	PU traffic system
Water tank	Potable-grade cementitious
Lift pit	Crystalline + injection backup

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7️⃣ Final Decision Rule

Correct waterproofing selection depends on:
✔ Water source
✔ Substrate
✔ Structural movement
✔ Exposure & usage
✔ Construction stage