This hot dip galvanized multi span film greenhouse is framed in galvanized steel or aluminium alloy and covered with a PO or PEP multi layer film. Spans run 8 m to 12 m, gutter height 3 m to 4.5 m and ridge height 6 m to 8 m, with width and length set to the site. The multi layer film is 0.08 mm to 0.2 mm with UV stabilisation and anti drip coating, gives 85 to 95 per cent light transmission, and the air pockets between the layers hold warmth on cold nights. Roof vents, side vents or automatic roll up systems handle ventilation. It suits commercial vegetable, flower and nursery production.
A multi span film house is the working end of protected cropping: it covers a large block for a fraction of the cost of glass, and it can be extended bay by bay as the business grows. What decides how well it performs is less the shape of the roof than the frame under it and the film over it. This hot dip galvanized multi span film greenhouse is specified around those two parts.
The frame is galvanized steel or aluminium alloy, set out as repeating spans on gutters with each bay tied to the next. That layout does three things: it puts a gutter under every roof valley so water is collected and carried clear of the walls, it keeps the floor free of a central post line, and it lets the house grow by adding spans rather than by rebuilding. Hot dip galvanizing is applied before fabrication, so the coating is not burnt away at the joints, and it is why the frame is rated for a 15 to 20 year service life. Spans run 8 m to 12 m, gutter height 3 m to 4.5 m and ridge height 6 m to 8 m.
The cover is a PO or PEP multi layer film from 0.08 mm to 0.2 mm. Multi layer construction is what allows the UV stabilising, anti drip and warmth retaining functions to sit in separate layers, so each works where it is needed instead of being diluted through one blend. The air pockets between the layers act as insulation, which is what holds temperature on a cold night and shortens the hours a heating system has to run. Light transmission runs from 85 to 95 per cent depending on the grade ordered.
| Structure material | Hot dip galvanized steel or aluminium alloy |
| Covering material | PO or PEP multi layer film, 0.08mm to 0.2mm |
| Roof shape | Arch roof, multi span on gutters |
| Span | 8m / 9m / 10m / 11m / 12m |
| Gutter height | 3m to 4.5m |
| Ridge height | 6m to 8m |
| Length | 10m to 100m, or to client demand |
| Light transmission | 85% to 95% |
| Film treatment | UV stabilised, anti drip, multi layer insulating air pockets |
| Ventilation | Roof vents, side vents or automatic roll up systems |
| Service life | 15 to 20 years for the frame under normal growing conditions |
Ventilation is by roof vents, side vents or automatic roll up systems, depending on how much control the crop needs. In a film house the two jobs are linked: the same openings that release warm air on a hot afternoon are the ones that have to close up and hold heat overnight, which is why the multi layer cover matters as much as the vents. Extension guidance from NC State University covers greenhouse climate management and crop response in protected cultivation.
The house ships as a kit of galvanized members, film rolls and fittings, flat packed to keep freight volume down. Work follows a fixed order: set the foundation, raise the columns and gutters, then arches and purlins, tension the film, and fit vents and doors. Our engineers can travel to site to guide installation when required.
Routine work is limited. Check film tension at the start of each season and look for any split at the fixings, wash the cover so transmission is not lost to dust, service vent and roll up drives, and inspect pipe joints and braces for movement after storm season. Film is the consumable part of the house and is replaced on a three to five year cycle.
The house suits commercial vegetable, flower and nursery production, and it is at its most useful where a large block has to be covered for a modest capital outlay and extended in stages. Trade reporting on GrowerTalks follows how commercial growers plan protected production. Browse the full product range, or look at the multi span PE film greenhouse and the multi span PE film house for other options on the same frame system.
It separates the UV, anti drip and warmth retaining functions into different layers so each works properly, and the air pockets between layers insulate, which holds temperature on cold nights.
Yes. Each bay is an independent span tied to the next along the gutter line, so additional spans follow the same sequence on the existing foundation.
The hot dip galvanized steel frame is rated for 15 to 20 years under normal growing conditions. The film cover is replaced on a three to five year cycle.
We provide a 10 year structural warranty and a 5 year anti-corrosion warranty on the galvanized frame. Details are set out in the contract for each project.
Send your site dimensions, the crops you plan to grow, the film thickness you prefer and your local wind and snow loads. We reply with a layout drawing and a full quotation.
