Greenhouse structures

In terms of cost to build, glasshouses are about 30-40% more expensive than a polyethylene greenhouse structure. However, in most cases we create a glass greenhouse because it’s necessary to meet the climatic challenges in its specific location. In addition, once a glasshouse is up and running, it can be a highly efficient growing environment which can deliver high yields and an impressive return on investment due to its high durability.

It depends on the specific environment. In general, the polyethylene itself needs to be replaced every three to five years. However, the steel greenhouse structure underneath is incredibly solid and well-built. It will remain intact for many years.

The majority of greenhouse structures have built-in windows for natural air supply and ventilation. In glasshouse greenhouses, these are 3-pane vents that are mostly located on the roof tops, alternating with fixed panes.

In polyethylene greenhouses and polytunnels, the venting window is throughout the ridge, in a continuous ventilation – either on one side of the ridge or both.

Natural airing lets fresh air come in and releases humidity and heat from the top of the greenhouse – and this natural airing is good enough ventilation for most geographies. However, in cases where it is not enough, you can add forced ventilation using exhaust vents and fans.

Over recent years the trend has been to build taller greenhouse structures – particularly glasshouses – increasing from 3m to 7m in height. This is in order to create an air buffer above the crop trellising to help eliminate heat and create a more stable and moderate climate around the top of the crops.