Flat roofs eventually require refurbishment. Traditionally, this meant a full strip-off and replacement of the existing waterproofing. Today, overlay systems using cold-applied Triflex PMMA liquid waterproofing provide a more sustainable, efficient, and cost-effective alternative.
What Is an Overlay System?
An overlay system installs a new waterproofing layer directly over the existing roof surface, after preparation. This avoids full removal, reduces waste, and extends the service life of the roof.
Key Benefits of Overlay Systems
1. Sustainability and Waste Reduction
Overlay systems preserve existing structures and divert waste from landfills—making refurbishment more eco-friendly.
2. Cold-Applied, No Hot Works
Triflex PMMA waterproofing is applied cold, reducing energy use and eliminating fire risk. Installation can proceed with minimal disruption.
3. Strong Adhesion Across Surfaces
PMMA bonds with a wide range of substrates—felt, asphalt, single-ply membranes, metal, wood, glass—giving flexibility in refurbishment projects.
4. Enhanced Thermal and Drainage Performance
Overlay systems can integrate tapered insulation to improve drainage and thermal efficiency, cutting long-term energy costs.
5. Fast and Weather-Resistant Installation
With Triflex PMMA, roofs are rainproof in 30 minutes and fully cured in 60 minutes—even in cold, wet conditions.
6. Long-Term Durability
Certified by BBA, overlay systems provide up to 25 years of performance, with options for re-coating to extend warranties further.
Overlay vs Full Roof Replacement
| Criteria | Overlay System | Full Replacement |
| Waste | Minimal, reuses existing substrate | High waste sent to landfill |
| Disruption | Building remains operational | Major disruption during works |
| Safety | Cold-applied, no fire risk | Hot works often required |
| Speed | Fast installation, all weather | Slower, weather-dependent |
| Cost | Lower overall lifecycle cost | Higher due to removal + disposal |
| Sustainability | Eco-friendly choice | Carbon-heavy process |
Why Businesses Choose Overlay Systems
- Lower environmental footprint – reuse existing roofs, cut emissions.
- Cost savings – reduce removal and disposal expenses.
- Operational continuity – buildings remain functional during work.
- Future-proofing – long-term warranties and re-coating options.
Overlay systems are particularly valuable for:
- Commercial buildings with minimal tolerance for downtime.
- Public facilities require safe, fast refurbishments.
- Industrial sites where hot works present safety risks.
Conclusion
Overlay systems with Triflex PMMA liquid waterproofing are a modern, sustainable solution for flat roof refurbishment. They reduce waste, improve efficiency, and deliver long-lasting protection, without the disruption of full replacement.
VIVABLAST is the official distributor of Triflex in Vietnam. Contact us for detailed consultation on waterproofing and flat roof refurbishment with overlay systems.