High Tunnel Mini
The Sun & Steel High Tunnel Mini is a compact, fully trussed greenhouse designed for home growers, market gardeners, and anyone who needs a serious steel structure in a smaller footprint. At 10 feet wide, 10 feet at the peak, and 7 feet at the sidewall, it delivers genuine commercial-grade construction — a galvanized bottom cord, W-diagonal, and return pipe form a real truss system on every interior arch — without the scale or cost of a full-width tunnel.
The Standard brings 7 gothic arches at 5ft on centre, 3 purlin runs, and 680 kg of galvanized Ø48mm steel — all on a ground-driven anchor system with no concrete required. The Heavy tightens the arch spacing to 4ft on centre, adding roughly 29% more structural capacity in the same footprint, with ~9 arches and 880 kg of steel — the right call for growers in colder climates or anyone planning to run it through a real Northern winter. Both models cover a standard 30-foot run and include a UV-stabilized poly film system with aluminum channel throughout — 6-mil on the Standard, 8-mil on the Heavy.
Engineered to spec
Every Sun & Steel structure ships as a complete, labelled kit on a heavy-duty galvanized frame. Here is exactly what goes into it.
Reference specifications shown for the High Tunnel Mini (Standard) build — framing scales proportionally across every length below.
Ground-anchor pipes driven directly into soil — arch foot slides over anchor top
One-piece bent arch half per side — base to wall to shoulder to peak — 2 pcs per arch, joined at peak
Horizontal chord at 7 ft height transferring structural load across the truss — 2 pcs per interior arch (5 interior arches)
Peak-to-junction diagonal braces connecting the arch crown to the bottom cord — 2 per interior arch
Return leg of the W-brace connecting the bottom cord junction back to the arch — 2 per interior arch
Cross-bracing on both end bays — resists lateral wind load at the gable walls
Horizontal perimeter channel at 5 ft height on all four walls
Longitudinal purlins running the full 30 ft — 2 mirrored shoulder runs + 1 ridge
Standard 3 ft × 6 ft 8 in door opening on each end wall — Ø48mm posts flanking each opening with vertical centre channel above Poly Channel System Aluminum channel with wiggle wire — perimeter girt, base, and eave lines on all four sides
6-mil UV-stabilized poly film — full gothic arch roof with 2 ft overlap on all edges
6-mil UV-stabilized poly film for both gable end walls
6-mil UV-stabilized poly film for both sidewalls
Reference specifications shown for the High Tunnel Mini (Heavy) build — framing scales proportionally across every length below.
Ground-anchor pipes driven directly into soil — arch foot slides over anchor top
One-piece bent arch half per side — base to wall to shoulder to peak — 2 pcs per arch, joined at peak
Horizontal chord at 7 ft height transferring structural load across the truss — 2 pcs per interior arch (7 interior arches)
Peak-to-junction diagonal braces connecting the arch crown to the bottom cord — 2 per interior arch
Return leg of the W-brace connecting the bottom cord junction back to the arch — 2 per interior arch
Cross-bracing on both end bays — resists lateral wind load at the gable walls
Horizontal perimeter channel at 5 ft height on all four walls
Longitudinal purlins running the full 30 ft — 2 mirrored shoulder runs + 1 ridge
Standard 3 ft × 6 ft 8 in door opening on each end wall — Ø48mm posts flanking each opening with vertical centre channel above Poly Channel System Aluminum channel with wiggle wire — perimeter girt, base, and eave lines on all four sides
8-mil UV-stabilized poly film — full gothic arch roof with 2 ft overlap on all edges
8-mil UV-stabilized poly film for both gable end walls
8-mil UV-stabilized poly film for both sidewalls
