Roof: transparent cover of a green house.
Gable: transparent wall of a green house
Cladding material: transparent material mounted on the walls and roof of a green house.
Rigid cladding material: cladding material with such a degree of rigidity that any deformation of the structure may result in damage to it. Ex. Glass
Flexible cladding material: cladding material with such a degree of flexibility that any deformation of the structure will not result in damage to it. Ex. Plastic film
Gutter: collects and drains rain water and snow which is place at an elevated level between two spans.
Column: vertical structure member carrying the green house structure
Purlin: a member who connects cladding supporting bars to the columns
Ridge: highest horizontal section in top of the roof
Girder: horizontal structure member, connecting columns on gutter height
Bracings: To support the structure against wind
Arches: Member supporting covering materials
Foundation pipe: Connection between the structure and ground
Span width: Center to center distance of the gutters in multispan houses
Green house length: dimension of the green house in the direction of gable
Green house width: dimension of the green house in the direction of the gutter
Polythene proves to be an economical cladding material. Now long lasting, unbreakable and light roofing panels-UV stabilized clear fiber glass and polycarbonate panels are available. Plastics are used in tropical and sub-tropical areas compared to glass/fiberglass owing to their economical feasibility. Plastics create enclosed ecosystems for plant growth. LDPE (low density polyethylene) / LLDPE (linear low density polyethylene) will last for 3-4 years compared to polythene without UV stabilizers.
Comparison of different kinds of covering materials