Northern Polytunnels

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01282 873120
Sales & Enquiries
01282 873120

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Commercial Single Span Polytunnels

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Commercial Single Span Polytunnels

Product Description

With almost 50 years of experience designing and manufacturing single span polytunnels we know what specifications are required to withstand the UK’s harshest weather conditions, and what is best suited to the needs of the commercial growers. We only use heavy duty commercial grade materials which is why we are the UK’s leading polytunnel manufacturer.


Please read our comparison brochure which highlights our strengths. We made the comparison because we think it is important to show you the differences between our polytunnels and those of some of our competitors. It’s all about being fit or purpose – all the parts and fittings we use are a heavy duty commercial grade to withstand heavy snow loads and high speeds. You’d never expect to find garden polytunnel fittings on a commercial polytunnel...We wouldn’t, would you?


Our CLASSIC commercial single span polytunnels are available in the following widths:


18ft (5.49 metres)


21ft (6.40 metres)


24ft (7.31 metres)


27ft (8.23 metres)


30ft (9.14 metres)


33ft (10.0 metres)


We offer the following specification on all of our CLASSIC Commercial Single Span Polytunnels as standard:


Steel Specification:  Our steel tube has a 1.5mm wall thickness and is fully galvanised (to construction grade Z35), both inside and out.


2 Piece Hoops:  All of our hoops are supplied in two halves, which makes our polytunnels much stronger and easier to assemble than polytunnels with 3 or 4 piece hoops.


Foundation tubes:  These are thick-walled (3.25mm), heavy gauge, and hot-dipped galvanised.  We wouldn’t use anything less because we understand how important it is to have extra strong foundations which are resistant to corrosion.


Fittings:  All fittings and brackets are heavy duty and zinc plated.  These are made by ourselves – NOT cheap imported fittings.


End Frames:  75mm x 75mm (3” x 3”) pressure treated timber, or aluminium box section (optional).


Side and Base Rails:  100mm x 50mm (4” x 2”) pressure treated timber, or aluminium box section (optional).


Polythene Tensioning:  All our polytunnels incorporate our unique cover-tensioning system, whereby each hoop has the facility to be raised up to 25cm (10”) on the foundation tubes after the cover has been secured.  This creates a drum-skin finish, ensuring a much longer life - even in the windiest locations.


Crop Bars (Bracing Bars):  50mm Steel tube with 32mm hangers (support bars) – We wouldn’t supply anything less!


Doors:  Aluminium framed, sliding doors – Strong, durable & low maintenance.


Ventilation Options:  Side ventilation - netted sides with roll-down screens (can be fully automated)


Roof mounted exhaust fans with a drop-down cowl (usually thermostatically controlled)


End louvres (rack & pinion operated or pull cord operation)


18ft & 21ft Widths


Steel Diameter: 50.8 mm


Straight Sides: Our 1.17m (3’10”) straight sides allow a 1.83m (6ft) working height within 45cm (18”) of the inside edge.


Foundation tubes: Hot dipped galvanised to ensure corrosion resistance.  43mm diameter with a 3.25mm wall thickness (1¼" nominal bore).


24ft, 27ft, 30ft & 33ft Widths


Steel Diameter: 60.3 mm


Straight Sides: Approx. 1.22m (4ft) straight sides allow a 1.83m (6ft) working height within 45cm (18”) of the inside edge.


Foundation tubes: Hot dipped galvanised to ensure corrosion resistance.  49mm diameter with a 3.25mm wall thickness (1½" nominal bore).


Cover Options


Lumisol Clear: Due to its clarity, clear polythene allows around 2% more light to enter your polytunnel than a diffused polythene cover. This extra light brings extra heat which can be a benefit during the early and late months of the growing season. More popular in northern and western regions where lower light levels and cooler temperatures naturally occur.  Especially useful where an early start to the growing season is required, but where higher summer temperatures are not too detrimental.


Lumisol Diffuse: Light-diffusing polythene films scatter natural light as it passes through the polythene film. This enables the light to penetrate deeper in to the plants canopy, as it hits the plant from all angles not just from the direction of the sun. This reduces the upper foliage shading the lower parts of the plant. The cloudy appearance of this polythene reduces the amount of light (mostly infra-red light) reaching your crop by around 2%. This reduction in IR light creates a slightly cooler daytime environment, up to 4°C lower at midday in mid-summer, which can be a considerable benefit to many crops especially in the sunnier parts of the UK.


SuperLux 50:50: Gives half the level of light diffusion as a fully diffused polythene film, making it an all-round polytunnel cover, especially for those who require a balance between light-diffusing and clear polythene. Considered by many as the ideal polytunnel cover for UK wide use.


Opaque White:  Produces shade and reduces daytime temperatures by only allowing around 65-70% light transmission.  Ideal for crops that require shade and cooler temperatures such as nursery stock, ferns, and conifers.  Also suitable for the overwintering of hardy shrubs and for general hardening-off.  Widely used in agriculture to cover polytunnel livestock housing, and for general storage uses. 


Green/White (Blackout) :  A black-out polythene with 0% light transmission.  Especially formulated to meet the needs of the mushroom grower.  Also used in conjunction with assimilated lighting to manipulate day length/duration. The green outer layer helps this cover blend in with the environment, whilst the white underside reflects artificial lighting to reduce light inputs.  A black core layer ensures complete opacity (black-out) and contributes to the durability of the film.


Shade Netting:  40% shade value (as standard).  Other shade values and net types can be catered for.  Dark green in colour.



 


PLEASE NOTE: Commercial Polytunnels may require planning permission, so it is always best to enquiry at your local planning office before purchasing a commercial polytunnel. Our IN-HOUSE team of structural design engineers can help with the planning application process by submitting planning application drawings for your site and include structure elevations. Prior to an order, this service will occur a charge which will be credited when a official order is received.

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Tel: 01282 873120 • Fax: 01282 871733 • Email: info@npstructures.co.uk
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Mill Green, Waterside Road, Colne, Lancs, BB8 0TA