Project-matched rails, frames and attachments for existing roofs
Roof-mount rails, support frames and attachments are selected around the existing roof construction and the module layout. Our package includes the specified rack steel and mounting parts; specialist roof attachments and weatherproofing components can remain with the roof-system supplier.
Roof connections, rails and module-retention parts are supplied to the approved roof-area schedule. PV modules, electrical equipment and site installation remain separate from the racking supply.
| Roof / attachment route | Racking items | Interface that defines the order |
|---|---|---|
| Standing-seam metal roof | Matched seam clamps, feet, rails and module-retention hardware | Exact seam profile, roof-supplier requirements and approved clamp/rail arrangement |
| Penetrating attachment on a metal roof | Attachment feet/brackets, structural fasteners, rails and identified weatherproofing parts | Roof sheet/profile, supporting member, fixing detail and flashing/seal assembly |
| Flat-roof support frames | Steel/aluminum support members, feet, connection parts and specified contact pads | Approved anchored or ballasted arrangement, roof capacity and membrane contact detail |
| Rail and module hardware lot | Scheduled rail lengths, splices, end/mid clamps or bolted retention parts | Selected module/frame, mounting positions and mating attachment interfaces |
Scroll sideways to see every column.
Seam shape, width and folding detail determine which clamp can seat correctly. The clamp and foot connect the rail to that seam arrangement, with their specified contact and fasteners. A similar-looking roof profile is not a substitute for the accepted attachment detail.
A penetrating attachment transfers reactions through its fastener to the specified roof support. Sheet profile, support location and connection depth belong in the fixing detail. Attachment centers follow that support layout, keeping the rack connection and the building structure aligned.
Frame footprint, rail elevations and module angle determine where a flat-roof array bears on the roof. Anchored connections or the engineered ballast arrangement complete its load path. Drain outlets, access routes and rooftop equipment remain visible in the layout rather than being covered by a repeated frame grid.
Wind zones and roof capacity affect attachment quantities and spacing. The approved roof design carries those reactions from module to clamp, rail, attachment and supporting construction; module test pressure alone does not size the roof rack.
When roof penetrations are restricted, use the roof-mounting approach guide to compare the attachment routes accepted for that roof.
Our roof-rack quotation identifies the rail material and section, full or cut lengths, splice positions and matching clamps or bolted retainers. Selection follows the actual module frame and mounting zones, together with the roof attachment. The LONGi figures below show one module-manual example of the geometry to check.
| Interface dimension | Manual value | Purchase check |
|---|---|---|
| Clamp bearing length | At least 50 mm | Bearing along the framed module |
| Clamp/frame overlap | 10 mm ≤ overlap < 12 mm | Bearing across the frame top |
Scroll sideways to see every column.
For the order, the selected module model and its applicable installation manual define the clamp geometry, positions and fastening requirements. Frame drainage openings and active glass surfaces remain clear of the retention parts.
A foot or bracket carries the structural connection; flashing and seal components protect the roof penetration. The accepted roof detail identifies how those pieces meet the covering and supporting construction. We separate their supplied quantities so the structural foot is not priced as if it were the whole weatherproofing assembly.
Flat-roof contact details identify the membrane, pad material and bearing arrangement beneath each foot. Those pads are matched to the roof-system requirements. The finished frame footprint also keeps the designed water paths and maintenance access open.
Fabricated steel members carry the specified galvanized or painted finish. Aluminum rails and specialist attachment parts retain their own material and surface requirements. Contact pads, isolating pieces and finished mating faces are included where shown on the accepted connection detail.
The rail schedule distinguishes full lengths, cut pieces and splice locations. Joints carry the selected system’s fasteners, engagement and movement detail. Openings, roof breaks and changes in support level create specific pieces rather than an assumed continuous rail run.
Module row ends need different retention pieces from joints between adjacent modules. The takeoff counts those positions from the actual array layout, together with the scheduled rail connections. Gaps at access routes or rooftop equipment remain separate row ends in that count.
Attachment bolts and clamp fasteners need usable tool access in the assembled arrangement. Roof-interface parts are grouped with their mating feet or rails, while the assembly drawings identify which connections are completed in the shop and which are made on the roof.
Standing-seam and flat-roof areas can share one procurement order. Each area keeps its own attachments and counted parts, even when the module model is the same.
An expansion order identifies the new module rows and the connection to retained rack parts. A replacement lot names the affected rail, foot or retention part and its mating interface. Those pieces can be priced separately from an entirely new rooftop array.
Rail profiles, attachment holes and mating foot or clamp faces are checked against their roof-interface part numbers. The inspection records identify the actual attachment checked.
Required mounting records identify the rail, retention parts and selected module or frame model. A dimensional match and an evaluated system combination are different procurement checks. Substituted components retain their own review before they enter the accepted parts schedule.
Bonding records identify the intended electrical path through clamps, splices and grounding parts. A rooftop fire record identifies its tested module, racking and roof assembly conditions. Where a UL 2703 record is required, we match its investigated function and configuration to the specified supply.
Structural attachment details carry their own roof connection and reaction requirements. Flashing documents address the water-penetration interface; UL 2703A addresses that function separately. The order document list distinguishes those records from module-mounting and bonding records.
Roof-rack prices itemize rails, support frames, attachments and module hardware by layout revision. Weatherproofing, contact pieces and required records are listed with the included and buyer-supplied parts.
Packing groups follow the roof-zone and row schedule. Rail bundles carry their lengths and piece counts; separate containers hold feet, clamps, splices and fastening sets. End/interior attachment quantities remain traceable to the area where they will be installed.
Long rails use supported bundles with protected contact faces and strap points. Small roof-interface parts are packed separately so gaskets and mating surfaces are not crushed by members. The packing schedule states bundle dimensions and quantities for the site team’s receiving and lifting plan.
Yes. Buyer-supplied attachments are excluded from our priced supply and identified on the parts schedule. The rail-to-attachment detail identifies the mating geometry, supplied hardware and any restrictions stated by that attachment supplier.
A new module can change the allowed clamp position, bearing geometry and evaluated mounting combination. Retained rack parts are matched against the new module and selected system requirements before the replacement parts schedule is released. An unchanged frame height alone does not establish compatibility.
The final roof profile and support construction become the attachment basis for fabrication. The roofing and PV installation sequence also identifies which interface pieces can be fitted before or after the new covering. We price the racking package against that accepted roof arrangement.
Yes. The rail schedule identifies full lengths, cuts and splice positions for each roof area. Part marks distinguish pieces around roof breaks, openings and changes in support level.
Share the roof plan or profile, selected module data and array layout, with quantities and the destination. A roof type and preliminary arrangement can start a budget quote. We itemize the racking, attachments and module hardware, including specialist supply responsibilities and shipment terms.