Double Arches Multi-span Greenhouse
Double Arches Multi-span Greenhouse
A large-scale cold-climate greenhouse that combines multi-span continuous interior space with a double-arch double-film roof system on every bay. Each span carries an outer load-bearing arch and an inner arch 40–60cm below it, each covered with its own film layer — the trapped air between them acts as a thermal barrier, reducing winter heat loss by 30–50% versus a standard single-film multi-span greenhouse. The shared gutters merge individual bays into one uninterrupted growing area, ideal for mechanized cultivation, rolling benches, and dense planting layouts in high-latitude or severe-winter regions.
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Key Highlights
· Multi-span continuous interior + double-arch double-film roof on every bay — scale and insulation in one structure
· 40–60cm trapped air gap between films, U-value 3.0–4.0 W/m²K — winter heating cost 30–50% lower than single-film multi-span
· Shared gutters with dual-film sealing profiles — positive drainage plus airtight insulation cavity across all bays
· Hot-dip galvanized steel frame, 275g/m² zinc coating, 15+ year service life — built for large-scale cold-climate commercial production
· 40–60cm trapped air gap between films, U-value 3.0–4.0 W/m²K — winter heating cost 30–50% lower than single-film multi-span
· Shared gutters with dual-film sealing profiles — positive drainage plus airtight insulation cavity across all bays
· Hot-dip galvanized steel frame, 275g/m² zinc coating, 15+ year service life — built for large-scale cold-climate commercial production
Product Overview — Scale Meets Insulation
The PONSUNO Double Arched Multi-Span Greenhouse is engineered for commercial operations in cold climates where neither a single-span tunnel nor a standard single-film multi-span greenhouse is sufficient. A single-span double-arch greenhouse offers excellent insulation but limited floor area; a standard multi-span greenhouse offers scale but poor heat retention in winter. This model solves both problems simultaneously: every bay is built with a double-arch double-film roof for insulation, and the bays are connected along shared galvanized gutters to create one continuous, open interior. The result is a greenhouse that delivers multi-span-level cultivation area and mechanization flexibility with double-arch-level heating efficiency.
- Structure & Materials. The load-bearing frame uses hot-dip galvanized steel with a 275g/m² zinc coating. Main columns range from 50mm to 200mm diameter, sized by span, bay count, and local snow/wind loads. Each bay features a double-arch roof: an outer arch (25–50mm pipe) that carries all external loads and supports the outer film, and an inner arch (20–40mm pipe) positioned 40–60cm below it that supports the inner film. Short galvanized spacer bars connect the two arches, maintaining the air gap and providing lateral stability. Gutters are press-formed from 1.5–2.5mm galvanized steel sheet, sloped for positive drainage, and designed with a special profile to seal both the outer and inner film layers at the valley — a critical detail in double-film multi-bay layouts where the air cavity must remain continuous and airtight across bays. All connections are bolted with galvanized hardware; no field welding required.
- Thermal Performance. — The Defining Advantage. The double-film air-gap system on every bay gives this greenhouse an overall heat transfer coefficient (U-value) of approximately 3.0–4.0 W/m²K — roughly half that of a standard single-film multi-span greenhouse (6.0–7.5 W/m²K). In winter, the outer film is exposed to ambient cold while the inner film stays close to indoor temperature; the stationary air layer between them resists conductive heat flow. Because the roof accounts for 60–70% of a multi-span greenhouse's total heat loss area, applying double-film insulation to the roof alone delivers a disproportionate reduction in heating demand. Field operations in cold climates report 30–50% lower fuel consumption compared to single-film multi-span greenhouses of the same area, with indoor temperatures maintained 5–8°C higher under identical heating input.
- Scale & Mechanization. — The Multi-Span Advantage. By connecting multiple double-arch bays along shared gutters, the greenhouse eliminates the side-wall waste and heat loss of separate tunnels and creates one continuous interior with no internal columns between bays. This open space accommodates tractor access, automated transplanting lines, rolling bench systems, hydroponic channels, substrate troughs, and vertical racking — all of which are difficult or impossible in single-span structures. The continuous roofline also simplifies the installation of uniform shading, heating distribution piping, and environmental sensor networks, ensuring consistent growing conditions across the entire cultivated area.
- Structural & Drainage Performance. The outer arch on each bay carries all external loads (wind, snow, rain) and is engineered to multi-span standards. Snow load resistance ranges from 0.30–0.45 kN/m² depending on steel specification — comparable to or better than a single-film multi-span greenhouse, since the double-layer system adds rigidity. Wind resistance is up to 130–150 km/h with reinforced options. The press-formed gutters with dual-film sealing profiles provide positive drainage while maintaining the integrity of the insulation air cavity — a detail that distinguishes a properly engineered double-film multi-span from a field-modified single-film structure.
- Trade-Offs. Three considerations. First, the double-arch frame and double-film covering on every bay increase material cost by approximately 30–45% over a comparable single-film multi-span greenhouse. Second, the inner film and air gap reduce light transmission by roughly 10–15% — acceptable in cold climates where heating is the limiting factor, but worth evaluating for high-light crops. Third, condensation management between the films is essential; the air gap should be designed with minimal moisture ingress and the inner film treated with anti-drip coating to prevent droplet buildup. Covering & Integrated Systems. The outer film is standard 150–200 micron PE/PO/EVA (anti-fog, anti-drip, UV-stabilized). The inner film is typically 100–150 micron PE/PO with anti-drip treatment. Side walls are selectable: double film (maximum insulation), polycarbonate hollow sheet, color steel sandwich panel, or glass. The structure carries the full range of automation systems: side and roof ventilation, internal/external shading (30%–85%), heating (hot-water boiler with distribution piping, unit heaters, or radiant floor — the primary system in cold climates), drip or spray fertigation, multi-zone environmental control with remote app access, supplemental LED/HPS lighting (essential at high latitudes in winter), CO₂ enrichment, and rolling benches or hydroponic growing systems.
Who It's For. Large-scale commercial vegetable and flower growers in high-latitude or severe-winter regions; operations where winter heating cost is the dominant operating expense and cultivation area must be maximized; growers requiring mechanized cultivation and uniform environmental control across a large continuous footprint; and investors seeking a cold-climate greenhouse that delivers multi-span productivity with significantly lower energy consumption.
| Parameter | Specification |
| Structure Type | Double-arch double-film multi-span greenhouse |
| Roof Profile | Double-layer arched roof — outer arch + inner arch, 40–60cm air gap |
| Span Width (per span) | 6m / 8m / 9.6m / 10m / 12m — customizable |
| Number of Spans | 2 – 10+ bays, customizable |
| Total Covered Area | 500 m² – 30,000 m² (scalable) |
| Length | 20m – 200m, in 3m / 4m / 5m increments |
| Outer Ridge Height | 3.5m – 6.0m (varies by span) |
| Inner Ridge Height | 3.0m – 5.5m (40–60cm below outer ridge) |
| Gutter Height | 2.5m / 3.0m / 4.0m / 4.5m — customizable |
| Air Gap Between Arches | 40 – 60cm (stationary insulation layer) |
| Main Frame Material | Hot-dip galvanized steel, 275g/m² zinc coating |
| Column Pipe Diameter | 40mm / 50mm / 60mm / 80mm / 100mm (per span & load) |
| Outer Arch Pipe Diameter | 25mm / 32mm / 40mm / 50mm (load-bearing) |
| Inner Arch Pipe Diameter | 20mm / 25mm / 32mm / 40mm (supports inner film) |
| Spacer Bars | 40–60cm galvanized steel, connecting outer and inner arches |
| Gutter | Hot-dip galvanized steel, 1.5 – 2.5mm thick |
| Outer Film | 150–200 micron PE / PO / EVA (anti-fog, anti-drip, UV-stabilized) |
| Inner Film | 100–150 micron PE / PO (anti-drip treated) |
| Side-Wall Covering | Double film / Polycarbonate hollow sheet / Color steel sandwich panel / Glass — selectable |
| Overall U-Value (Roof) | 3.0 – 4.0 W/m²K (vs. 6.0–7.5 for single-film multi-span) |
| Light Transmission | 75% – 82% (double film, new condition) |
| Natural Ventilation | Side vents + motorized roof vents (rack-and-pinion) |
| Mechanical Cooling | Optional fan & pad evaporative cooling system |
| Shading System | Optional internal / external motorized shade net (30% – 85%) |
| Heating System | Optional hot-water boiler + distribution piping / unit heater / radiant floor (primary in cold climates) |
| Irrigation & Fertigation | Optional drip / spray / ebb-and-flow with automated dosing |
| Environmental Control | Optional multi-zone sensor + central controller + remote app |
| Supplemental Lighting | Optional LED / HPS grow light system (recommended for high-latitude winters) |
| CO₂ Enrichment | Optional bottled or burner-based CO₂ delivery |
| Growing Systems | Optional rolling benches / hydroponic channels / substrate troughs |
| Snow Load Resistance | 0.30 – 0.45 kN/m² (per steel specification) |
| Wind Load Resistance | Up to 150 - 200 km/h (reinforced options available) |
| Door | Double sliding door or hinged door (1.5m × 2.5m standard) |
| Foundation | Concrete strip foundation or independent column foundation |
| Frame Service Life | 15 – 20 years (with proper maintenance) |
| Outer Film Service Life | 3 – 5 years (depending on film grade and climate) |
| Inner Film Service Life | 4 – 6 years (protected from UV by outer film) |