S-5! SolarFoot Exposed-Fastener Metal Roof Mount: Specifications and Installation

Key Takeaways

• The S-5! SolarFoot is an engineered pedestal bracket that attaches any racking manufacturer's L-foot to exposed-fastener metal roofs.
• Factory-applied butyl co-polymeric sealant encased in an integrated reservoir prevents seal extrusion and UV breakdown without field chemical sealants.
• SolarFoot holds UL2703 electrical bonding certification, ASTM 2140 water penetration resistance listing, and Sunnova AVL approval.
• Attachment screws must fasten through pre-punched holes into structural wood decking, wood purlins, or steel purlins.

What Is the S-5! SolarFoot Mounting Bracket?

The SolarFoot™ Bracket is an engineered aluminum attachment foot designed specifically for exposed-fastener metal roofing profiles. On standing seam roofs, solar arrays are secured using non-penetrating clamps that grip vertical seams. However, on exposed-fastener roofs—such as corrugated or trapezoidal sheeting fastened with screws driven from the exterior—installers must penetrate the panel into supporting structural framing.

SolarFoot is a simple, cost-effective pedestal for L-Foot attachment of rail-mounted solar PV. The bracket can be used to mount any L-foot to exposed-fastened metal roofs, such as AG-panel or R-Panel. Rather than relying on generic flashing sheets designed for composition shingles, SolarFoot provides a direct, low-profile interface.

Installers looking to Attach Any Rail Manufacturer’s L-Foot Onto Your Exposed-Fastener Metal Roof find that SolarFoot accommodates L-feet from IronRidge, Unirac, SnapNrack, Pegasus, and K2. The assembly includes a top-mounted M8 stud that accepts standard racking slotted brackets. For homeowners evaluating whether rooftop solar risks roof leaks, review do-solar-panels-damage-your-roof alongside solar-panels-on-a-metal-roof.

Weatherproofing Architecture and Integrated Sealant Reservoirs

Roof leaks on exposed-fastener metal buildings almost always stem from two failures: degraded field caulking or over-torqued EPDM washers that squish out under screw heads. Field-applied silicone or polyurethane tubes degrade under direct solar ultraviolet radiation within 5 to 10 years, cracking and admitting wind-driven rain.

SolarFoot eliminates field-applied chemical sealants through an engineered sealing chamber. Integrated reservoir prevents over-compressing seal. The base of the SolarFoot features a precision-cast aluminum perimeter wall that encapsulates a thick pad of industrial butyl co-polymer sealant.

When mounting screws are driven down into the roof:

1. Controlled Seal Compression: The aluminum perimeter walls land firmly against the metal roof surface, establishing a positive mechanical stop that prevents the installer from over-compressing or squeezing out the butyl gasket.
2. Total UV Shielding: S-5! brackets feature integrated sealant reservoirs to prevent over-compression of the seal and to protect the sealant from UV degradation. The solid metal casting shields the butyl from sunlight and weather exposure across decades of service.
3. Zero Chemical Curing Time: No risky, field applied sealants are ever used. Installers do not need to clean caulking guns, wait for adhesive cures, or worry about temperature limits during freezing weather.

This weatherproofing technology allows SolarFoot to pass rigorous independent laboratory water intrusion testing, meeting the requirements of ASTM 2140 static water pressure head penetration resistance. Contrast this with shingle flashing methods detailed in ironridge-flashfoot2-roof-mount-guide-us.

Substrate Compatibility and Structural Fastening Rules

Looking to Mount Solar Using Rails on Exposed-Fastener Metal Roofs requires establishing a solid structural connection into building framing. Unlike standing seam clamps, which attach purely to panel seams, SolarFoot transfers uplift and downward forces through structural fasteners driven into the building skeleton.

Designed to straddle minor striations in your roof panel for attachment into decking or structure, SolarFoot can be fastened into a variety of substrates, including the wood deck, wood timber purlins or steel purlins.

SolarFoot is compatible with almost any trapezoidal rib, exposed-fastened profile. The bracket's wide base straddles the valley or flat portion of the profile between major ribs, providing a stable, non-wobbling foundation.

Step-by-Step Installation Process

1. Locate Structural Framing: Determine the location of the supporting structure of the roof. Use a magnetic stud finder or inspect the roof underside to mark structural purlin lines.
2. Clean Roof Surface: Wipe away surface dirt, loose rust, or moisture from the attachment footprint.
3. Drive Fasteners into Structure: Install screws through the pre-punched holes in the SolarFoot into the structure below. Drive the specified self-drilling screws until the aluminum casting seats firmly on the metal panel.
4. Secure L-Foot Bracket: Install the L-Foot over the stud and secure in place with the provided M8-1.25 hex flange nut. Torque the flange nut to the racking manufacturer's recommended torque setting (typically 12 to 15 ft-lbs).
5. Mount Racking Rails: Slide horizontal or vertical aluminum rails onto the L-feet and proceed with standard module installation.

For extreme wind load zones, review structural engineering recommendations in florida-hurricane-resilient-solar-and-wind-load-guide.

Safety: Roof Penetrations and Fall Protection

Installing solar mounts on exposed-fastener metal roofs requires adhering to rigorous occupational safety standards:

• Purlin Hit Verification: Driving screws into thin metal sheeting without engaging underlying wood purlins or steel members creates a catastrophic pullout failure risk during wind uplift events. Always confirm fastener bite into structural framing.
• Fall Protection Anchors: Exposed-fastener metal roofs present severe slip hazards, particularly when wet or pitched above 3:12. All personnel must use temporary fall protection equipment anchored to structural roof trusses, never to solar brackets or sheet metal ribs.
• Electrical Hazard Prevention: When drilling through metal roof decks, map interior electrical conduit runs and lighting circuits. Striking energized building wiring with a steel screw creates severe electrical shock and fire hazards. De-energize subpanel circuits in the work zone prior to drilling.

When to Call an Engineer or Roofing Contractor

Certain conditions require professional evaluation before installing SolarFoot mounts:

• Aged Sheet Metal Fasteners: If existing exposed roof screws have backed out or have rotted neoprene washers, the entire roof requires re-screwing before solar mounting.
• Light-Gauge Metal Sheeting Without Purlins: On agricultural buildings where purlins are spaced wider than 4′-0″, an engineer must verify whether decking thickness provides adequate pullout resistance.
• Commercial Warranty Retainage: Commercial metal roofs under active weather-tightness warranties require manufacturer sign-off before drilling penetrations to avoid voiding warranty coverage.