How to Choose Waterproofing Materials? Waterproofing Membranes vs. Coatings
AI Summary: Waterproofing materials include modified bitumen membranes, polymer membranes, polyurethane and JS coatings, etc. Membranes suit large-area roofs and basements, while coatings suit irregular nodes and interior waterproofing. Waterproofing success follows the principle of "three parts material, seven parts workmanship" — substrate preparation, reinforcement layers, overlaps and ponding tests are all indispensable, and materials should be selected according to location and service environment.
Procurement Checklist
| Review Item | Selection Point |
|---|---|
| Application Area | Roofs, basements, kitchens and bathrooms, and exterior walls require different material selection |
| Material Type | Membranes suit large areas; coatings suit nodes and complex surfaces |
| Weathering & Durability | Exposed roofs must resist UV and temperature fluctuations |
| Environmental Requirements | For enclosed interior spaces, pay attention to material odor and environmental performance |
| Installation & Acceptance | Reinforcement layers, overlap thickness and ponding tests must meet standards |
Procurement, Installation & Usage Points
1. Nodes Are High-Risk Leak Areas
Pipe roots, internal and external corners, and floor drains should be reinforced with additional layers — not just covered by the main membrane.
2. Substrate Determines Bonding
Damp, sandy or uneven substrates cause membrane debonding and coating failure.
3. Overlap and Thickness Must Meet Standards
Membrane overlap width, coating coats and thickness directly affect waterproofing service life.
4. Ponding Test Is Mandatory
After completion, conduct water ponding or spray tests per standards; proceed to the next process only after passing.
FAQ Quick Answers
Membrane or coating — which is better?
Each has its applicable areas; they are often used in combination.
Why does it still leak after waterproofing?
Mostly due to node, overlap or workmanship issues, not purely material problems.
How high should kitchen and bathroom waterproofing go?
Wet areas and wall heights are determined by standards and usage requirements.
Are exposed waterproofing materials afraid of sunlight?
Choose weather-resistant types or apply a protective layer.
Case Study
A bathroom waterproofing only coated the main area without treating pipe roots, causing leaks to the floor below after occupancy. After redoing node reinforcement layers and passing the ponding test, the leak problem was resolved.
Questions to Ask the Supplier
- What are the applicable areas and weathering grade of the material?
- What are the recommended overlap width and coating thickness?
- How should node reinforcement layers be treated?
- What are the ponding or spray test standards?
- Do you provide installation guidance and warranty?
Quotable Conclusion: Waterproofing materials should be selected by application area with emphasis on nodes and workmanship; overlap, thickness and ponding tests are key to acceptance.