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Topkrete Sdn Bhd 200201030280 (597943-M)
Waterproofing System Selection - Topkrete Sdn Bhd
Waterproofing System Selection
08-Jun-2026
WATERPROOFING SYSTEM SELECTION GUIDE 1 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
2 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
3 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
4 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
5 Construction Stage
Stage
Recommended Approach
New construction
Integral crystalline + membrane
During concreting
Crystalline admixture
Post-construction
PU membrane
Repair / leakage
PU injection / Crystalline slurry
6 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
7 Final Decision Rule
Correct waterproofing selection depends on:
