Florida Licensed Roofing Contractor — CCC1330718
1" concealed-fastener standing seam panel with Florida Product Approval FL29523. HVHZ-rated, 24ga Galvalume steel, Kynar 500 finishes. Installed by Coastal Roofing and Waterproofing Inc., license CCC1330718.
Metal Alliance 100SL
The Metal Alliance 100SL is a 1-inch snap lock standing seam metal roofing panel engineered for Florida's demanding coastal environment. Unlike exposed-fastener panels that rely on screws driven through the face of the metal, the 100SL features a concealed fastener system — the clips that secure the panel to the roof deck are hidden beneath the seam itself. This eliminates the most common failure point in metal roofing: rubber-gasketed screws that degrade, back out, and leak after years of UV exposure and thermal cycling.
With a Florida Product Approval number FL29523, the 100SL has been tested and accepted for use across the state, including jurisdictions that require HVHZ compliance. Coastal Roofing and Waterproofing Inc. installs this system with proper clip spacing, underlayment, and attachment patterns engineered for the wind loads specific to your property's exposure category and building height. Our Florida roofing license CCC1330718 ensures every installation meets or exceeds local code requirements.
The 1-inch seam height provides clean architectural lines while delivering strong wind uplift resistance. Panels snap together by hand without special seaming tools, reducing installation time.
Sliding clips allow thermal movement without stress on the panel or fasteners. No exposed screws means no exposed leak points — the #1 advantage over through-fastened metal roofs.
Manufactured from 24-gauge Galvalume-coated steel for superior corrosion resistance in salt-air coastal environments. Galvalume outlasts galvanized steel by decades in Florida's humidity.
Premium Kynar 500 (PVDF) coating delivers exceptional color retention and chalk resistance for 40+ years. Available in Charcoal, Bronze, Bone White, Colonial Red, Forest Green, Galvalume Natural, and Antique Bronze.
Metal Alliance 100SL panels qualified as cool roof products when finished in lighter colors such as Bone White or Galvalume Natural. These finishes reflect a high percentage of solar radiation, reducing attic temperatures by 20–40°F and cutting cooling costs during Florida's extended summer season. The Kynar 500 coating maintains its reflectivity over decades, unlike paint systems that degrade and lose thermal performance. For homeowners seeking LEED points or energy-code compliance, the 100SL in cool-roof colors is a strategic choice that pays dividends through lower utility bills year after year.
The 100SL is versatile enough for both steep-slope residential roofs and low-slope applications down to 2:12. On steep-pitch homes, the 1-inch seam creates a crisp, modern architectural profile that complements contemporary and transitional designs. On low-slope roofs — common on Florida ranch-style homes and commercial additions — the concealed fastener system prevents the water infiltration that plagues exposed-fastener panels at lower pitches. This versatility makes the 100SL an excellent all-around choice when a single product needs to cover multiple roof planes at different angles.
Properly installed Metal Alliance 100SL roofs routinely last 40 to 70 years — far exceeding the 15–20 year service life typical of asphalt shingles in Florida's UV-intense climate. The Galvalume substrate carries a manufacturer's warranty against red rust, and the Kynar 500 finish is warranted against chalking, fading, and peeling. When combined with Coastal Roofing and Waterproofing Inc.'s workmanship and our thorough understanding of HVHZ installation requirements, the 100SL delivers decades of maintenance-free performance.
Color Options
FAQ
The Metal Alliance 100SL can be installed on roofs with a slope as low as 2:12 (2 inches of rise per 12 inches of run). For slopes between 2:12 and 3:12, we use specialized underlayment and increased lap dimensions to ensure watertight performance. Steeper slopes above 3:12 allow standard installation with full clip spacing.
Yes. The 100SL carries Florida Product Approval FL29523 and meets HVHZ wind-uplift requirements when installed with the approved clip pattern and underlayment system. Coastal Roofing and Waterproofing Inc., license CCC1330718, follows the exact installation protocols required for HVHZ compliance in Broward and Miami-Dade Counties.
The 100SL's concealed fastener system eliminates the exposed screws that are the primary leak source in through-fastened metal roofs. While the initial cost is higher than 5V Crimp or ribbed panels, the 100SL requires virtually no maintenance — no screw replacement, no gasket degradation — and typically lasts two to three times longer, making it a better long-term investment.
All products installed by Coastal Roofing and Waterproofing Inc. carry valid Florida Product Approvals. We only install code-compliant materials meeting the Florida Building Code and HVHZ requirements.
Metal Alliance 100SL carries Florida Product Approval FL29523, rated for HVHZ installation throughout Broward and Miami-Dade counties.
Get a free inspection and quote for your Metal Alliance 100SL standing seam roof today.