Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame 1

Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame 2

Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame 3

Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame 4

Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame 5

Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame 6

Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame

The Sainpoly Large PC Double-Layer Agri Greenhouse is a roomy, weather-protective growing shelter built with a sturdy steel frame and double-layer polycarbonate panels. Its selling points: double-layer PC glazing for better insulation, light diffusion and impact resistance; a robust steel frame for long-term stability against wind and snow; and generous interior space for rows, benches or shelving. Together these features mean easier year‑round growing, lower maintenance and reliable protection for vegetables, flowers and seedlings.

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Ventilation system

Manual and Electric

Bay Width

Span Width

9.6m 10.8m 12m

Packing

Safe Packing

Covering

PC Sheet Cover Greenhouse

Frame material

Glavanized Steel Materials

Height

4.5-8m

Cooling system

Cooling Fan System

Instruction for use

With installation manual and installation video.

Insulated Double-Layer Steel Frame

The Sainpoly Large PC Double-Layer Agri Greenhouse is a durable, high-performance Multi span Polycarbonate greenhouse with a hot-dip galvanized steel frame and double-layer PC panels that deliver superior light transmission and thermal insulation for year-round production. Its three-roof-per-span shape, customizable sizes, 6/8/10mm sheet options and secure flat-pack packaging with clear assembly manuals ensure quality, easy installation and long service life. Optional automatic shading, ventilation, cooling systems and NFT hydroponics plus professional after-sales engineering support help commercial growers maximize yields while saving water, labor and energy.

Double Layer Steel Greenhouse

The Sainpoly Large PC Double-Layer Agri Greenhouse is a Multi span Polycarbonate greenhouse built on a hot-dip galvanized steel tube skeleton, featuring customizable large spans with three roofs per span and double-slope roofing, and fitted with 6/8/10mm double-layer PC sheets that combine high light transmission, strong compression resistance and low thermal conductivity for long-term durability. Functionally it integrates automated/manual shading, gear-motor driven roof and side ventilation, exhaust fans with cooling pads and optional NFT hydroponics to deliver precise climate control, water- and fertilizer-saving cultivation, and robust load-bearing for coverings and mechanical systems. As a factory-made solution with a 16,000 m² workshop, 100 hectares annual capacity, sample availability, OEM customization and global installations in over 70 countries, it provides easy assembly with planning drawings, professional after-sales support and a value proposition of improved crop quality, operational efficiency and long-term ROI.

Sturdy Steel PC Greenhouse

The Sainpoly large PC double-layer Agri greenhouse has a robust hot-dip galvanized steel frame with 6–10mm tube options and a durable, UV-resistant polycarbonate covering that provides excellent light transmission and low thermal conductivity. This Multi span Polycarbonate greenhouse employs a multi-span, double-slope roof layout (three roofs per span) and supports customizable sizes, shading, ventilation, cooling and NFT hydroponic systems for vegetables, fruits and flowers. Founded in 1997, Sainpoly manufactures and supplies large-scale greenhouses with professional planning and installation support, long-lasting skeleton materials rated for over 15 years, and a minimum order of 300 square meters.

◎ Durable Steel Frame

◎ Double Layer Protection

◎ Customizable Cultivation System

Spacious Durable Insulated Greenhouse

Sainpoly's Large PC Double-Layer Agri Greenhouse pairs a galvanized steel frame with UV-stabilized twin-wall polycarbonate panels, reflecting precision engineering and the brand's long-standing horticultural expertise. The Multi span Polycarbonate greenhouse design delivers modular scalability with excellent light diffusion, thermal insulation and resistance to wind, hail and UV for both commercial and backyard growers. Key features include corrosion-resistant steel arches, double-layer PC panels, quick-assembly connectors, integrated ventilation and drainage, offering extended growing seasons, reduced energy costs and low-maintenance durability.

Material introduction

The Sainpoly Large PC Double-Layer Agri Greenhouse is a Multi span Polycarbonate greenhouse featuring a robust hot-dip galvanized steel tube skeleton with 6/8/10 mm thickness options for long-lasting corrosion resistance and structural durability. Its double-layer polycarbonate (PC) sheets on the roof and sides deliver high light transmission, strong compression resistance, good thermal insulation and UV protection while remaining lightweight and bendable for easy installation. Combined, the galvanized steel frame and anti-UV PC covering form a stable, low‑maintenance agricultural structure ideal for vegetables, fruits and flowers across varied climates.

◎ Hot-dip Galvanized Steel

◎ Double Layer Polycarbonate

◎ High-strength Multi-span

FAQ

What are the typical usage and application scenarios for the Sainpoly Large PC Double-Layer Agri Greenhouse, Steel Frame?

This greenhouse suits seed starting, vegetable and herb production, nursery propagation, flower cultivation, and small-scale commercial growing. It’s ideal for season extension (early spring/late fall), overwintering tender plants, protected cultivation for tomatoes, cucumbers, peppers, lettuce and ornamentals, and for research or teaching plots. Community gardens, market growers, and hobbyists benefit from its larger covered area and controlled environment.

How does the double-layer polycarbonate and steel frame affect plant environment and performance?

The twin-wall polycarbonate provides good light diffusion with UV protection while improving thermal insulation compared to single-layer plastic — helping stabilize daytime/nighttime temperatures and reducing heating needs. The galvanized steel frame gives strong structural support and long life. Together they reduce wind-blown damage and heat loss, creating a more consistent microclimate for faster, healthier plant growth.

How should I manage ventilation, temperature, and humidity inside this greenhouse?

Use a combination of natural and mechanical ventilation: roof vents, side vents or roll-up sidewalls, and intake/exhaust fans. Add shading cloth or whitewash for hot sunnier days, and heaters or thermal mass for cold nights. For humidity control, ventilate during warm parts of the day and use drip irrigation or misting systems rather than overhead watering. Automated thermostats, vents and fans are recommended for consistent control in commercial or busy setups.

Can this greenhouse endure adverse weather like wind, snow and heavy rain?

The galvanized steel frame is designed for durability and, when properly anchored to a prepared foundation, resists moderate wind and precipitation. Double-wall PC panels shed rain and offer structural rigidity. However, local wind speeds and snow loads vary — you should follow the manufacturer’s anchoring and bracing instructions, remove heavy snow accumulations promptly, and consider reinforcing the structure or adding a stronger foundation in high-wind or heavy-snow regions.

What site preparation, installation effort and tools are needed to set it up?

Choose a level, well-drained site with good sun exposure. Prepare a compacted base or concrete/treated wood foundation per the manual. Basic tools (wrenches, drill, level, ladder, silicone or sealant) and 2–4 people are typically required for assembly; larger models may need more hands. Follow assembly instructions for panel sequencing and sealing; anchoring properly is critical for longevity and safety.

What routine maintenance, cleaning and lifespan can I expect from the greenhouse?

Inspect fasteners, seals and anchoring annually and tighten or replace parts as needed. Clean polycarbonate panels with mild soap and soft cloth—avoid abrasive cleaners and solvents. Remove snow, clear gutters/drainage and manage pests with screening and IPM practices. With proper care the polycarbonate can last 8–15+ years and the galvanized steel frame can last decades; replace damaged panels promptly to maintain insulation and light diffusion.

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