This 29-gauge panel delivers 80,000 psi tensile strength—stronger than many 26-gauge competitors—while carrying comprehensive UL certifications that matter for Montana’s weather extremes. The high-tensile steel construction means contractors get durability without the weight penalty of thicker gauges.
Anti-siphon sidelap design addresses the water infiltration issues that plague standard ribbed panels. The WeatherXL SMP coating system uses 10 layers of protection, earning 30-year fade and chalk warranties that back up the performance claims.
Superior Strength Specifications
The 80,000 psi tensile strength changes the conversation about gauge thickness. Stronger than standard 26 GA due to 80k psi high-tensile steel, this panel proves that material science matters more than raw thickness.
| Specification | Value |
|---|---|
| Gauge | 29 GA |
| Tensile strength | 80,000 psi (full-hard steel) |
| Yield strength | 80,000 psi |
| Nominal thickness | Approximately 0.015” - 0.016” |
| Substrate | Galvalume (AZ50 aluminum-zinc alloy coating) |
| Panel coverage | 36” (3 feet) |
| Rib height | 3/4” |
| Rib spacing | 9” on center |
That tensile strength handles Montana snow loads without the sagging issues of lower-grade steel. The full-hard temper maintains structural integrity under load cycles that would permanently deform softer metals.
Comprehensive UL Certifications and Coating System
UL 2218 Class 4 hail resistance means this panel survives 2-inch diameter ice balls dropped from 20 feet. UL 790 Class A fire rating satisfies wildfire zone requirements across Montana’s WUI areas. UL 580 Class 90 wind uplift certification proves it stays put in chinook country.
The WeatherXL SMP (Silicone Modified Polyester) / Enduracote 10-layer paint system builds protection from the substrate up. SMP offers better scratch resistance and lower cost compared to PVDF coatings. The silicone modification improves UV resistance and flexibility through temperature cycles.
| Warranty Coverage | Duration |
|---|---|
| Fade & chalk (walls/roofs) | 30 years |
| Film integrity (walls/roofs) | Lifetime |
| Non-perforation acid rain (walls) | 25 years |
| Non-perforation acid rain (roofs) | 20 years |
| Edge rust acid rain (galvanized) | 15 years |
Installation Specifications
2.5:12 minimum slope works for most Montana applications—steep enough for snow shed without going vertical. Custom cut up to 40 feet eliminates horizontal seams on most residential and agricultural projects.
Exposed fasteners with EPDM washers keep installation straightforward. Fastener spacing at 9” o.c. width-wise; 2-3 ft o.c. length-wise provides adequate holding power without over-penetrating the substrate.
The panel works with standard wood purlins or decking with underlayment. Compatible with Sno-Jax snow guards for managing snow slides above doorways and valleys.
Matching trim (ridge, drip, gable, valley), color-matched screws, vented and solid foam closures, butyl sealants, and synthetic underlayment complete the system. Having all components from one manufacturer eliminates color matching headaches.
FAQ
What makes 29-gauge strong enough for Montana snow loads?
The 80,000 psi tensile strength provides strength equivalent to many thicker gauges. This high-tensile steel construction handles structural loads through material properties rather than raw thickness. Standard 26-gauge panels often use 50,000-65,000 psi steel, making this 29-gauge panel effectively stronger.
How does the WeatherXL coating compare to PVDF?
WeatherXL SMP coating uses a 10-layer protective system that offers better scratch resistance and lower cost than premium PVDF options. The silicone modification improves flexibility and UV resistance while maintaining color retention backed by 30-year fade and chalk warranties.
What’s included with the roofing panels?
The system includes matching trim pieces (ridge, drip, gable, valley), color-matched screws, vented and solid foam closures, butyl sealants, and synthetic underlayment options. Panels themselves come custom cut up to 40 feet to minimize field cutting.
Can this panel handle Montana’s hail storms?
UL 2218 Class 4 hail resistance certification represents the highest impact rating available. This means the panel withstands 2-inch diameter ice balls without penetration—exceeding requirements for most Montana insurance carriers.
What roof slopes work with Grandrib 3?
The 2.5:12 minimum slope requirement accommodates most agricultural and residential applications. The anti-siphon sidelap design provides additional protection against wind-driven rain at these lower slopes.
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