Medicinal Cannabis and Marijuana Hemp greenhouses

Redpath manufacture, distribute and install our range of commercial crop greenhouses from its factories based in New Zealand and Australia.
Medicinal cannabis or marijuana where legal and authorized to grow can achieve substantially improved production levels when grown under controlled environmental conditions. They are fully NZ building code compliant design engineered structures, utilising strong RHS steel with long-life coatings, 12mm fully bolted 4mm plate connections, and cold rolled ‘walk-through’ wide steel gutters as standard. 
Redpath use and recommend Duratough greenhouse film for this growing of medicinal marijuana as it has a high P.A.R (Photosynthetic Active radiation) transmittance level.
Greenhouse production of this crop is increasing in overseas markets, as the quantity of crops per year can be substantially improved, and the low energy needs that a good quality greenhouse provides due to its natural ability to harvest sunlight and energy offering savings on supplementary lighting and heating costs.

Natural ventilation via full length rack and pinion ridge ventilation is usually selected. Redpath supply these with automatic electric motor/drives. Automatic ridge mounted roof ventilation systems are proven world-wide to provide accurate control of temperature and humidity surrounding the adult plants growing environment and these systems are highly suited to New Zealand’s conditions. The roof ventilation system can be quarantine screened to exclude pests using the ‘radial screen’ design developed by Redpath.
A full length side wall rack & pinion tilting 1m width window vent can also be fitted, in either Auto or manual form, these have the advantage of being extremely reliable and may be opened even when raining.
For sheltered sites or where bio-security is paramount an option is to use a Redpath “forced air vented” greenhouse design. These utilise air inlet and extraction fan systems (sometimes with cooling evaporative pads on the inlet side). Redpath also offers the forced air ventilation option where temperatures are higher and humidity is relatively low or where quarantine levels are paramount.

Other factors to consider for this crop are the greenhouse must have the ability fit overhead black out screens, thermal screen systems and in some cases overhead supplementary lighting support when required. Pest exclusion systems minimise spray use and secure entrance ways and sealed ‘annexes’ etc are straight forward options with Redpath designs.

Redpath manufacture and supply direct in small or large areas. Sizes range from just a few hundred square metres for propagation or trial purposes – through to our multiple hectare designs for commercial production.
Redpath operates 16 construction teams, we manage the building permit application and can help with resource consents if they arise. We then build on your site using local builders that then continue to offer local after sales service. Redpath have supplied and erected 1000s of these designs throughout our nearly 40 year history. A full set of registered engineers drawings and Producers statement for council building permit processing are included as standard

Redpath work alongside leading hydroponic grower consultants who help manage the plant production systems required.

Basic Specifications of designs: NZ Design registration, PS1 form included for building permit

Span / Bay Widths: 6m, 8m, 9.6m, 10.65m, 11.2m, 12.6m, 13m, 14m & 15m clear spans.
Post spacing length ways: 3 metres between posts (spacer beam to allow of 6m centres also an option)
Height to to top edge gutter: 3m, 3.5m, 4metres
Apex height: Up to 6.5 metres
Side manual ventilation: Roll up wall, manual or optional automatic. Rack & pinion side vents also available
Side automatic ventilation: Rack & pinion tilting window vent, full auto operation, operates in rain or shine
Sidewall Fans:  A forced air fan extraction system or add matching cooling pad inlet pad system.
Security Sides: Hard clad side walls are an option with this design
Blackout screen compatible: Yes, screens quoted as an optional extra
Roof ventilation: Rack and Pinion design, full length, with auto or manual control, Single facing or Double facing “butterfly” options
Roof cladding: Single-skin or Twinskin Duratough 215 micron
Wall cladding: Single-skin or Twinskin Duratough 215 micron, Shadecloth cladding or Hard security cladding also an option.
Greenhouse film anti-fog package: Included for reduced overhead dripping onto crops
Frame Guard Tape: Polyguard fitted to all roof members that touch the plastic included
Gutter design: V type steel, Walk-through, Powder coated exterior, drip tray included, Overlap sealed joints, Duralock & Rainheads included
Doors: Sliding door with aluminium framed, aluminium base sheet with clear acrylic top section panels, doors may be in end or sidewall
Footings: Typically 1.3 metre deep x 0.450 diameter (soil type dependent)
Wind load: 120 kph, greater if required
Crop loading: 15 kg m2, greater if required, crop kit system included on request. (overhead wire location by client)
Snow load: Yes, snow-load compliant up to 50kg m2
Installation: Yes nationwide including building permit application/processing. Kitset only is also an option.
Main assembly: All bolted design, Rubber sleeves (3mm thick) fitted to all poles at ground contact for superior anti-corrosion
Warranty: Yes, manufacturer’s warranty & maintenance schedule included (conditions apply)

Hard surface security wall side and end wall cladding

Related links