This Venlo glass greenhouse uses a hot-dip galvanized steel frame and 4mm tempered glass. The Venlo roof runs a series of small ridges across the bay, which gives the house its even light and its strength against wind. Roof vents set along the ridge let hot air out, and a cooling pad on the side wall pulls cooler air in, so the house holds its temperature through hot days. It suits hydroponic vegetable and flower growing at commercial scale.
This Venlo glass greenhouse covers a working growing area under a tempered glass roof on a hot-dip galvanized steel frame. The Venlo roof runs a row of small ridges across the bay instead of one wide span. That shape sheds rain and snow well, gives the crop even light, and stands up to wind. Roof vents sit along the ridge and a cooling pad runs along the side wall, so the house can hold its temperature on hot days. Spans run from 8m to 12m and total height from 3m to 8m.
The frame uses hot-dip galvanized steel pipe and trusses. The zinc coating protects the steel in the humid air of a working greenhouse, which keeps the structure sound through years of service. The Venlo roof carries its load through a series of small ridges, so the bay takes wind and snow without a heavy frame.
The covering is 4mm tempered glass. Tempered glass is heat treated so it breaks into small granules rather than long shards, and it holds light transmission of 90% to 95% across the crop. Glass does not yellow or sag the way some plastic covers do, so the light reaching the plants stays steady over the life of the house.
| Structure material | Hot-dip galvanized steel pipe |
| Covering material | 4mm tempered glass |
| Roof type | Venlo roof, multi-span |
| Span | 8m / 9m / 10m / 11m / 12m |
| Length | 10m to 100m, or to client demand |
| Total height | 3m to 8m |
| Light transmission | 90% to 95% |
| Ventilation and cooling | Roof vents along the ridge, cooling pad on the side wall |
| Service life | 15 to 20 years under normal growing conditions |
| Applications | Hydroponic vegetables, fruit and flowers |
The roof vents sit along the ridge, which is the highest point of the bay. Hot air rises to the ridge and leaves through the vents, while cooler air is drawn in lower down. A cooling pad on the side wall drops the incoming air temperature as it passes through, which is what lets a glass house run through a hot summer. FAO notes that protected cultivation of this kind extends the growing season and raises yield per square metre in many climates.
Vent area and cooling pad size are set to the crop and the local climate. The vents can also be tied to an automated system so the house holds a target temperature without manual work.
The Venlo roof is the standard shape for commercial glass houses in northern Europe, and growers choose it for two reasons. First, the small ridges spread the load, so the bay takes wind and snow with a lighter frame than a single wide span. Second, the shape gives more even light across the floor, which matters for a crop grown at high density. HortiDaily covers how commercial growers plan this type of structure.
The frame ships as a knockdown kit of galvanized pipe and connectors, and the glass is supplied in crates. Assembly follows a set sequence: set the foundation, raise the trusses and bays, then fit the glazing and seals. Our engineers can travel to site to guide installation when required.
Routine work is limited. Check the glazing clips, seals and vent gear after storm season, wash the glass if dust builds up enough to cut light, and inspect the pipe joints for movement. The galvanized frame is rated for 15 to 20 years under normal growing conditions.
This Venlo glass greenhouse suits hydroponic vegetable production, fruit and flower growing and general commercial horticulture. 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 glass greenhouse page, or compare it against the polycarbonate greenhouse and film greenhouse ranges.
A Venlo greenhouse has a roof made of a row of small ridges across the bay rather than one wide span. The shape sheds rain and snow well and gives even light across the crop.
A cooling pad on the side wall drops the temperature of incoming air as it passes through. Combined with the roof vents along the ridge, it lets the house run through a hot summer.
The tempered glass holds its light transmission for many years, and the hot-dip galvanized steel frame is rated for 15 to 20 years under normal growing conditions.
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 connectors, with the glass in crates. Our engineers can travel to your site to guide installation when required.
