Fabral Horizon S100 - 26 GA Galvalume

The Horizon S100 delivers snap-lock standing seam performance that Montana contractors need — UL Class 4 impact resistance for hail, Class A fire rating, and custom lengths up to 40 feet that reduce field seams and installation time. At 26 gauge Galvalume AZ50 Grade 80 steel with 16-inch coverage width, this panel system hits the sweet spot between material cost and structural performance for residential and light commercial projects.

The snap-lock design eliminates hand-seaming labor while the anti-siphon sidelap handles snowmelt and ice backup — critical details when you’re working at 3:12 minimum pitch in snow country.

Installation Efficiency and Performance Specs

The snap-lock system changes the installation math. Start at the eave, hem the panel 1 inch, fasten through the flange with #10 x 1” wafer-head screws at 12-inch maximum centers. No crimping tools. No field seaming. A hem-bending tool, rubber mallet, and impact driver handle the entire installation.

Cold climate installations demand Ice & Water Shield extending 24 inches past exterior walls — non-negotiable in Montana. Continuous synthetic underlayment covers the entire deck, with 30-pound felt optional over existing shingles for retrofit applications.

Specification	Value	Source
Panel Coverage	16”	manufacturer
Seam Height	1”	manufacturer
Gauge	26 GA	manufacturer
Steel Grade	Galvalume AZ50 Grade 80	manufacturer
Minimum Pitch	3:12	manufacturer
Max Panel Length	40’ (switch to 24 GA over 30’)	manufacturer
Fastener Spacing	12” max centers	manufacturer
Impact Rating	UL 2218 Class 4	tested
Fire Rating	UL 790 Class A	tested
Wind Uplift	UL 580 Class 90	tested

The anti-siphon sidelap design prevents water from backing up under the seams during freeze-thaw cycles. Ethofoam backer rods reduce oil-canning in temperature swings — a common issue with any standing seam panel that shows up worse in Montana’s extreme thermal cycling.

Warranty Coverage and Long-Term Value

Fabral backs the Enduracote finish system with lifetime paint film integrity, 30-year chalk and fade protection, and 20-year non-perforation warranty. Those aren’t marketing numbers — they reflect real-world performance in UV exposure and temperature extremes.

For spans over 30 feet, Fabral requires switching to 24 gauge panels with 1.5-inch seam height. This isn’t upselling — it’s structural reality for snow loads and thermal movement on longer runs.

The custom length capability up to 40 feet eliminates horizontal seams on most residential applications. Fewer seams mean fewer leak points and faster installation. The system uses standard trim components — eave, ridge (vented or solid), gable, sidewall, endwall, valley, and transition pieces — with compatible polyurethane sealants and butyl tape.

The Bottom Line

The Horizon S100 earns its place through certified performance ratings that matter for building codes and insurance, plus installation efficiency from the snap-lock design. General contractor sentiment rates Fabral high for durability and the Enduracote finish, though oil-canning remains a consideration even with backer rod mitigation.

The 26 gauge construction works for most applications, but respect the 30-foot threshold where 24 gauge becomes necessary. Store panels elevated and dry before installation, remove the strippable protective film during install, and use the recommended Ethofoam backer rods. Do those three things and this panel system delivers what it promises.

Frequently Asked Questions

What makes the snap-lock design better than traditional standing seam? The snap-lock eliminates hand-seaming labor entirely. Panels lock together with a rubber mallet instead of requiring specialized crimping tools and experienced installers. Faster installation means lower labor costs and fewer weather delays.

How does the anti-siphon sidelap work? The sidelap design prevents water from backing up under panel seams during snowmelt and ice formation. This feature matters more in freeze-thaw climates than in steady cold or warm regions.

Why switch to 24 gauge over 30 feet? Thermal expansion and contraction create more stress on longer panels. The thicker 24 gauge material (with taller 1.5-inch seams on the SSR profile) handles these forces better than 26 gauge. It’s about preventing oil-canning and maintaining seam integrity.

What’s included with the panel system? Panels come bare — order trim separately including eave, ridge, gable, valley, and transition pieces. Fasteners (#10 x 1” wafer-head screws for panels, #14 WoodTite for trim), sealants (polyurethane tubes, butyl tape), and accessories like pipe boots and touch-up paint are available but sold separately.

Does the Class 4 impact rating reduce insurance premiums? The UL 2218 Class 4 rating qualifies for insurance discounts in many areas. Check with your insurance carrier — Montana insurers increasingly recognize impact-rated roofing for hail-prone regions.