This galvanized polytunnel greenhouse uses a hot dip galvanized steel frame under a five-layer co-extruded PO film with UV protection. The film keeps high light transmission and runs low fog with continuous anti-drip, so leaves stay dry and the crop sees even light along the row. Span runs from 8m to 12m and height from 3m to 8m, with length set to the site. It is built for tomato and vegetable growers working commercial ground.
This galvanized polytunnel greenhouse covers one bay of open ground with a hot dip galvanized steel frame and a five-layer co-extruded PO film. The film keeps high light transmission across the season and runs low fog with continuous anti-drip, so condensation does not fall back on the leaves. The arch carries the cover without posts inside the bay, leaving a clear run for beds, paths and small machinery. Span runs from 8m to 12m and height from 3m to 8m, with length set to the site.
The frame uses hot dip galvanized steel pipe and formed hoops. The zinc coating resists the humid air of a working greenhouse and keeps the structure sound through years of service. Hoops are tied by purlins and cross braces, and the whole frame is assembled from bolted sections on site without welding.
The cover is a five-layer co-extruded PO film with UV protection and anti-static treatment. It holds warmth, diffuses light along the row and resists the yellowing that shortens the life of plain film, so it keeps working through several seasons before replacement.
| Structure material | Hot dip galvanized steel pipe |
| Covering material | Five-layer co-extruded PO film with UV protection |
| Roof shape | Arch roof, tunnel type |
| Span | 8m / 9m / 10m / 11m / 12m |
| Length | 10m to 100m, or to client demand |
| Total height | 3m to 8m |
| Film features | Low fog, continuous anti-drip, anti-static |
| Service life | 15 to 20 years for the frame under normal growing conditions |
| Applications | Tomato, vegetable, fruit and flower growing |
A polytunnel is the simple form of a protected house. The arch carries the film without posts in the middle of the bay, so beds, paths and machinery run clear from end to end. The covered area warms faster than open ground in spring and holds heat into the evening, which is why it is common for tomato and vegetable growing. FAO notes that protected cultivation of this kind extends the growing season and raises yield per square metre in many climates.
The five-layer PO film is built to keep light transmission high while cutting the yellowing that shortens the life of plain film. Low fog and continuous anti-drip keep condensation off the crop, so leaves stay dry and the risk of fungal problems drops. Ventilation comes from rolling up the side film or opening an end flap. HortiDaily covers how commercial growers plan this type of structure.
The frame ships as a knockdown kit of galvanized pipe and hoops, and the film is supplied in rolls. Work follows a set sequence: set the foundation, raise the hoops and purlins, then tension the film over the frame. Our engineers can travel to site to guide installation when required.
Routine work is limited. Check the film tension after storm season, clean the film in spring to keep light transmission up, and inspect the pipe joints for movement. The galvanized frame is rated for 15 to 20 years under normal growing conditions.
This galvanized polytunnel greenhouse suits tomato and vegetable growing, fruit and flower crops and general farm cover work. Because span, length and height are all set to demand, the same frame system fits a small holding or a large estate. Browse the full range on our tunnel greenhouse page, or compare it against the film greenhouse and glass greenhouse ranges.
The cover is a five-layer co-extruded PO film with UV protection and anti-static treatment. It keeps light transmission high and runs low fog with continuous anti-drip.
Yes. The frame is hot dip galvanized steel pipe, which resists the humid air of a working greenhouse and is rated for 15 to 20 years under normal growing conditions.
It is built for tomato and vegetable growing as well as fruit and flower crops. The high arch also lets pickers and small machinery move along the row.
Span is available in 8m, 9m, 10m, 11m and 12m. Total height runs from 3m to 8m, and length from 10m to 100m or to your site requirement.
The frame ships as a knockdown kit of galvanized pipe and hoops, with the film in rolls. Our engineers can travel to your site to guide installation when required.
