Greenhouse growers have endless options for their structures. When choosing the ideal one for your farming, the square footage, material type, and advanced components are some of your determining factors. Your greenhouse’s roof is arguably its most important consideration since it directly influences the climate of your growing environment.
Open roof systems are now the popular option among most clients of greenhouse manufacturers like Conservatory Craftsmen. This is because these systems, unlike closed ones, have improved air circulation, enhanced natural light levels, and reduced cooling costs from electric fans. Here are the available options for your greenhouse’s open roof system.
Retractable Film Systems
In these systems, the glazing is made of a plastic film that folds as it is retracted. The film is hung on hooks, which slide along stainless steel wires. Most retractable film systems come with different motors for separate bays to allow their independent operation. The systems provide at least 95% natural ventilation when open and are typically used with roll-up or removable sidewalls.
Flat Roof Systems
These bear a close resemblance to retractable systems but unlike the latter have no trusses. This considerably reduces the glazing material, structural and installation costs of flat roof systems. The lack of trusses, however, makes them incompatible for use with a broad range of automation equipment. Some equipment like boom irrigation systems can nonetheless be mounted on your greenhouse’s sidewalls.
Rolling Roof Systems
This is the oldest open roof system. It comprises bows attached to lattice trusses, which span each bay. Tube-type motors are used to drive the roof’s covering on either side of the bay up or down. Nylon mesh films in plastic layers are the typical roof coverings used in rolling roof systems.
The above open roof designs are natural ventilation systems. Heat from your greenhouse will hence be removed by a pressure variation resulting from a difference in temperature and wind gradients. This natural ventilation results in enhanced plant hardening, insect screening, and dormancy maintenance.