A heavy duty polytunnel greenhouse on a hot-dip galvanized steel frame, built for vegetable and fruit growers who need a metal greenhouse that lasts through storms. The polyethylene cover is held by aluminum clips on a grooved channel frame, with optional drip irrigation, ventilation and heating systems pre-fitted. Fast to erect, simple to relocate, and a practical step up from a light hoophouse. Send us your field size, crop list and climate, and we will confirm a layout and quote within 24 hours.
A polytunnel only earns its keep if the frame is built for your weather, not just your budget. This heavy duty polytunnel greenhouse runs on a steel frame with hot-dip galvanized structure, sized for vegetable and fruit growers who expect a metal greenhouse to last through storms and heavy seasons. The polyethylene cover is held by aluminum clips on a grooved channel frame, and optional drip irrigation, ventilation and heating systems can be fitted before delivery. It is the practical middle ground between a light hoophouse and a glasshouse: strong, affordable, and fast to install.
1. Heavy duty steel frame
This is a metal greenhouse built to take real weather, not a weekend kit. The hot-dip galvanized structure resists rust at joints and clamps, and the arch frame spreads snow and wind load the way a rigid frame should.
2. Grooved channel frame with aluminum clips
The polyethylene cover locks into a grooved channel frame with aluminum clips, so it holds through wind gusts and re-covering is a simple job. A grower in a storm-prone area told us this design kept the cover intact through a full season of gales.
3. Polyethylene cover options
Single or double layer PE film keeps the cost low while giving crops reliable light transmission and UV protection. In strong-sun regions, the right film choice matters more than in mild climates, and we supply UV-stabilized options as standard.
4. Optional irrigation, ventilation and heating
Drip irrigation, side ventilation and heating systems can be fitted before delivery. For vegetable growers, drip tape is the difference between a good season and a great one, and we pre-fit it on request.
5. Fast to erect and simple to relocate
All joints are bolted and numbered, so a small team can put it up quickly and take it down if the land lease changes.
This polytunnel greenhouse suits vegetable and fruit growing, from tomato and pepper to strawberry and leafy greens. It works for market gardeners who want a vegetable greenhouse without the cost of a tall house, and it pairs with drip irrigation for efficient water use.
If you are weighing this against other structures, compare it with our tunnel greenhouse range, the PC greenhouse line for rigid panels, or the wider film greenhouse range.
We have delivered greenhouse projects in 27 countries, and the frame is where our experience shows. Every arch pipe end carries a stamped BZ mark, our anti-counterfeit sign, so replacement parts years later are traceable to our plant. Our engineer team can travel to your site to supervise installation, and the package covers the metal structure, covering system and install accessories. Structural design follows the load and durability principles of EN 13031-1 for commercial greenhouses, and crop-level growing guidance is published by ISHS. Tell us your field size, crop list and local climate, and we will confirm a layout and quote within 24 hours.
Q: What is the lifespan of different types of greenhouses?
A: Up to 3-5 years for film, 20+ years for glass and polycarbonate greenhouses. Film covers require replacement every 3-5 years, while the galvanized steel frame lasts over 20 years. Glass and PC panels offer longer service life with minimal maintenance, making them ideal for permanent installations. Our greenhouse frames use hot-dip galvanized steel pipes with a double-sided zinc coating of 200-275 g/m², providing uniform, dense, and strongly adherent protection specifically engineered for high-humidity greenhouse environments and long-term corrosion resistance.
Q: How long does it take to install a commercial greenhouse?
A: Installation typically takes 2-4 weeks depending on project size and complexity. Standard multi-span greenhouses can be erected in 10-20 working days by our experienced technical team at Ziyang Bozong. On-site assembly time varies based on local conditions and project scale, but we provide detailed installation manuals and remote guidance to streamline the process.
Q: Can you customize greenhouse specifications for my farm?
A: Yes, we offer full customization including dimensions, span width, height, covering materials, and ventilation systems. Simply share your crop type, local climate conditions, and growing area requirements, and our engineering team at Ziyang Bozong will design a tailored solution that optimizes your growing environment and maximizes ROI.
Q: What is your warranty policy for greenhouses?
A: Our galvanized steel frame comes with a 5-year warranty against corrosion and structural defects. Film covers include a 3-5 year UV warranty depending on the grade selected, while glass and PC panels are covered by manufacturer warranties. Ziyang Bozong provides technical support and replacement parts throughout the lifespan of your greenhouse.
Q: What is the advantage of a multi-span greenhouse over multiple single-span tunnels for large-scale commercial production?
A: The primary advantage is land utilization efficiency. Multi-span greenhouses eliminate the gaps between individual tunnels—typically 1-2 meters per gap depending on drainage and access requirements—which can represent 10-15% of total land area in large single-span installations. This additional growing area translates directly to higher production capacity within the same land footprint. Beyond land savings, the continuous interior space simplifies equipment movement, reduces travel time for workers and machinery, enables more efficient irrigation system layout, and creates uniform growing conditions across the entire structure—supporting consistent crop quality and simplified management protocols.
1. Is this polytunnel strong enough for snowy regions?
With the steel frame and correct arch spacing, it handles winter loads in most temperate regions. For heavy snow areas, tell us the expected snow load and we will upgrade the specification.
2. Can I add drip irrigation later?
Yes, but it is cheaper and cleaner to pre-fit it before delivery. Drip tape systems for vegetable rows are a standard option we install at the factory.
3. What is the difference between this and a hoophouse?
A hoophouse is usually a light, temporary structure. This polytunnel uses a heavier steel frame and grooved channel glazing, so it lasts longer and carries more wind and snow load.
4. Do you ship the complete package?
Yes, metal structure, covering system and installation accessories ship together, and optional systems are added before delivery. For trade media coverage of the greenhouse industry, Produce Grower is a useful source.
Mark Wu, Co-founder & Lead Engineer, Ziyang Bozong Greenhouse. 17 years designing commercial greenhouses for growers in 27 countries.
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