A solar L-foot bracket connects the aluminum mounting rail to the metal roof surface. The vertical leg bolts to the rail with an M8 or M10 bolt, and the horizontal base fastens through the roof sheet into the purlin or rafter below. An EPDM gasket on the base seals the penetration against water ingress. It is the primary load-transfer point between the array and the building structure, and it carries the full wind uplift load of the panels above it.

Standard production is 6005-T5 extruded aluminum with clear or black anodizing at 12 to 25 microns, verified by XRF per ASTM B568. Tensile strength is 260 MPa minimum with yield strength at 240 MPa minimum, tested per heat lot on a spectrometer. For coastal, offshore, and high-humidity installations we produce SUS 304 or SUS 316 stainless steel equivalents. Zinc-aluminum-magnesium coated steel is available as a mid-cost option for moderate environments.

Yes. Because the cross-section is set by the extrusion die and not the cut length, leg heights from 40 mm to 200 mm are routine without new tooling investment. Base plate dimensions, slot length, fastener hole diameter, and the addition of a drainage channel or stiffening rib are all customizable. Send a drawing or a photo of your roof profile with a tape measure laid across it, and we will confirm feasibility and tooling cost within 24 hours.

We run prototype quantities from 500 pieces and production volumes in the tens of thousands. Because tooling is not required for standard cross-sections, the minimum is set by setup efficiency rather than die cost. For custom cross-sections requiring a new extrusion die, the MOQ is typically 3,000 to 5,000 pieces to amortize the die. Prototype lead time is 7 to 15 days; production lead time is 20 to 30 days depending on volume and finishing.

L-feet work with trapezoidal profiles (fasten at the high rib), corrugated profiles (requires a contoured gasket or saddle seat), and R-panel profiles (fasten on the flat top, at least 25 mm back from the rib edge). Standing seam roofs should not be drilled at all — use a non-penetrating seam clamp, which we also manufacture. Bracket geometry and gasket shape differ between profiles, so always confirm your exact roof type before ordering.

The bracket itself is not certified in isolation — load capacity is a system property determined by the bracket, the fastener, the purlin, and the spacing. We supply material certificates, dimensional inspection reports on a Zeiss CMM, and load test data for the bracket assembly. We can also supply PPAP level 3 documentation. Your racking designer should calculate spacing per ASCE 7, AS/NZS 1170.2, or EN 1991-1-4 based on your site wind speed and roof height.

Yes. EPDM gaskets are pre-installed or supplied loose, UV-stabilized and rated for 25 years outdoor exposure at shore A 60-70 hardness. Fasteners are SUS 304 A2-70 or SUS 316 A4-80 stainless steel. We do not supply zinc-plated carbon steel fasteners with aluminum brackets, because permanent aluminum-to-steel contact with moisture present causes galvanic corrosion that destroys the bracket within two to three seasons in coastal air.

Send us your roof profile (a photo with a tape measure is enough), required leg height, target quantity, roof type, and any finishing or certification requirements. If you have a drawing, PDF, STEP, or DXF, include it. We reply within 24 hours with DFM feedback, indicative pricing, tooling cost if applicable, and lead time. For projects with an existing rail system, tell us the rail channel width and required bolt diameter so we can confirm slot compatibility.