Performance Advantages of Specifying G90 Galvanized Finish on Type B Metal Deck for Florida Projects
We offer specification, supply, and installation support for G90 Type B metal deck for Florida coastal and high-humidity projects
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Summary
- G90 boosts corrosion resistance vs G60
- Longer service life and lower maintenance
- Preferred for coastal Florida projects
Specifying a G90 galvanized finish on Type B metal deck for Florida projects delivers measurable performance gains in corrosion resistance, service life, and project compliance. Miami Metal Deck explains how the heavier zinc coating, proven in lab and field testing, protects roof and floor decks from salt air, humidity, and mechanical damage while simplifying long-term maintenance planning.
Why G90 Matters in Florida
Florida projects face elevated corrosion risk from salt spray, high humidity, and cyclic wetting. G90 provides roughly 50 percent more zinc coating mass than G60, increasing sacrificial protection and delaying corrosion breakthrough on exposed surfaces and cut edges.
That extra zinc means fewer repairs, longer coating service life, improved paint and membrane adhesion, and stronger resistance to perforation in coastal atmospheres, translating into lower lifecycle costs for your building.
Performance Metrics and Testing
G90 galvanized panels perform better in accelerated corrosion tests such as ASTM B117 salt spray and cyclic exposure evaluations. Designers and owners see extended time-to-first-perforation and reduced pitting rates compared with lower coating weights, which supports more reliable warranties and insurance underwriting.
Galvanizing is also sacrificial protection: even when edges or fastener holes are exposed, zinc provides cathodic protection to the steel substrate, slowing corrosion progression and preserving structural capacity of the Type B deck.
Specification and Compliance Benefits
Specifying G90 on Type B metal deck aligns with ASTM A653 material classes and often satisfies stricter local requirements for coastal construction. Using a clear G90 specification reduces submittal friction, helps contractors source compliant material, and minimizes change orders during procurement.
Miami Metal Deck supplies mill-certified G90 Type B panels, issues test documentation, and offers specification support, quality control inspections, and tailored handling to prevent on-site damage, ensuring the product performs to expectation across Florida climates.
Cost, ROI, and Project Considerations
While G90 carries a modest premium versus lower coating weights, the reduced maintenance, longer service life, and lower risk of corrosion-related failures typically yield strong lifecycle ROI for Florida Type B metal deck applications. For coastal or high-humidity sites, G90 is a cost-effective specification to protect asset value.