5. Type: Heavy Duty Professional Polytunnel. Straight Side: 3ft 6in. We provide services such as polytunnel kits, garden equipment's, replacement covers and many more. co. It can be used as a seasonal cold frame but is also heavy-duty enough to be used as an inexpensive, year-round High Tunnel growing structure. 1m & 7. Whether you want a small polytunnel greenhouse for your garden or you are looking for a professional polytunnel greenhouse with room for hundreds of commercially grown plants, you can find what you are looking. From €700. See full list on epicgardening. 8M (9’2″). We offer greenhouse film; benders and jigs for high tunnels and low tunnels; and supports, anchors, and hardware to keep it all together. Building a polytunnel can be simple and straightforward with the right tools and materials. Then add two sheets for the ends of the polycarbonate tunnels. 45m. Country/Region of Manufacture: United Kingdom. Previous Next. 10FT Wide X 24FT Long; 7FT6 Tall working height throughout with 2FT 9 straight sides (slow gradual curve to 7FT 6, giving maximum head height) perfect. It is a straight-sided polytunnel. We can go as small as 8 feet wide x 20. Extending the traditional growing and marketing season should be a high priority for West Virginia produce growers. The dripper lines are spaced 30 cm apart and 15cm from the edge of the bed. 01-0456 845-013 845-071. We're a small up and coming UK based business, which focuses on growing Organ. 6m high. Choose 5 Sizes Polytunnel + Ground Anchor Kit. Diagonal brace bars which attach to the second foundation tube, and part way up the front hoop to the give the end of the tunnel support. It is important that a polytunnel framework is well anchored into the ground - Anchor Plates are the ideal way of ensuring your polytunnel does not lift or s. If you would like to discover more about Polytunnels then w. SALE! $10,051. 50. This polytunnel greenhouse structure allows for excellent ventilation. Colonial Gable Greenhouse Kits comes in 8×8, 8×12, 8×16, 10×12, 10×14 or 10×16. $18. Product offerings include farm supplies, aquaponic, poultry supplies, agriculture products, animal housing, home improvement, commercial high tunnels and hoop houses, fodder growing kits, livestock care and greenhouse equipment, including garden. Optional extras. Roll-up side windows with insect net 🌬️. Discover our greenhouses and polytunnels. 4. Made from 140 g PE fabric, with a galvanised steel metal frame, this tall 6 x 3 x 2 m polytunnel can cover a large flowerbed or vegetable patch. €39. August 22, 2020. 2019 Direct Plants sent a 14ft by 30ft polytunnel kit to review. 57m) Dream Polytunnel From £682. Polytunnel repair tape can be used to fix small tears and rips in your polythene cover. available for orders up to £1,000. 5mm Wall Thickness Z35 High Tensile Galvanised Tube As used to manufacture all our Polytunnel kits. BRAND NEW 14FT X 30FT POLYTUNNEL KIT - HEAVY DUTY PROFESSIONAL GREENHOUSE - ND. 4. Polytunnels allow you to work outside, in your garden, in any weather. These classically designed 14ft wide polytunnels are aerodynamically shaped to withstand high winds and storms. Distance Over Hoop: 24ft 8in. 9FT Tall and has maximum working height throughout, full standing height from approx 1FT in. You don’t have to source materials or wonder if you have the correct components. Then, drape a sheet of heavy duty polytunnel. You'll al. Starting at $2,489. Our most popular size though is 14 feet wide and is available in both straight or the more traditional curved designs. Our kits use pressure treated timber for the frame and thick plastic tubing to create the structure. Low tunnels are temporary structures that are approximately 4 feet tall and 3 to 6 feet wide. Instead of a rope system, the structure is secured by metal base and hip board, side-braces, and purlins. Brand new | Business. Pro Tip: For optimal results, position your greenhouse on level. The 6m through to 12m length tunnels include a 1. Type: Heavy Duty Professional Polytunnel. Ultra violet radiation from the sun degrades plastics over time, including polytunnel covers. Free postage. Discover our greenhouses and polytunnels. £22. 6m length roof vent. FieldPro Gothic 30' with skids (8 MB) If you need additional technical support or have a question not answered here, we can be reached 8 AM to 4:30 PM central time, Monday through Friday at: Phone: 800-852-3443 (toll-free US and Canada) or 651-463-7009. 5mm Wall Thickness Z35 High Tensile Galvanised Tube As used to manufacture all our Polytunnel kits. Product Options: Grow bigger plants, faster with our High Tunnel Greenhouse Kit: the perfect all-in-one greenhouse kit for anyone from novice gardeners to expert growers. Australian Manufacturers and Suppliers of Horticultural Structures and Equipment. Polythene Type: Professional Horticultural Industry Grade. We offer a range of hinged or sliding doors and spare parts for those customers looking to refurbish a Polytunnel, buy second hand Polytunnel or even relocate a Polytunnel. Our basic Easy-Build polytunnel kit includes all our unique features mentioned above, but also includes our most popular options: Single sliding door at the front, screw anchor foundation tubes and Polygro EVA 200mu commercial grade greenhouse film that we source from a New Zealand supplier to. With our range of polytunnels we offer two types of polythene as standard and either will enable you to grow your plants and crops to a really high standard. Poly Tunnels provide lots of space & light at a fraction of the cost of a glass glazed greenhouse. T Bracket for Mini Polytunnel €2. 3m Poly Houses) A$395. This is the double door pack, if you require a single, click here. Steel Diameter: 28mm. Self assembly polytunnel kits from the Gardeners Delight range are available for the DIY enthusiast, all sizes available from polytunnelsdirect. Our standard kits include an all-steel polytunnel frame – made from Z35 high tensile galvanised steel and using larger diameter steel hoops than our competitors for extra strength and rigidity – including foundation tubes, hoops, corner. All polytunnels are provided as self-assembly kits. Download Construction Guide - PDF;The mini tunnel kit does not have to be used outside, it can be used in an existing polytunnel or greenhouse to create a sort of double glazing effect. 99. D. Available standard polytunnel kits sizes: Width: 10ft, 12ft, 14ft, 16ft & 18ft Length: 13ft, 20ft, 27ft, 33ft, 40ft, 46ft, 52ft & 60ft If you require a polytunnel more than 60ft long, please call us for a Quotation. uk. Tomatoes are a warm-season crop and grow best in temperatures ranging from 65-85 degrees Fahrenheit ( 18-28 °C). People often tend to think of polytunnels as being quite small. Northern Polytunnels have been manufacturing polytunnels since 1969. £. Polytunnel Kits. With fittings, hinged doors on both ends, anchor plates, and super-therm 800-gauge (200-micron) polythene cover, a commercial Polytunnel will cost you in the region of $3,500. However, it’s been well worth the effort as it continues to provide us with an abundance of vegetables despite unpredictable and harsh frosts. The Best Manufacturers of Polytunnel Kits. 58 139. This kit is a polytunnel gutter only, designed to be used in conjunction with a Timber Side Rail kit or our Aluminium Side Rail kit. The Easy-Build kit, Basic kit, what is included. After a couple of seasons, the cover started to disintegrate and we got frustrated with having to roll up the door each time we went in there, so we made the decision to modify it. Toggle menu. 99. This means that the sides are vertical for about 3 feet before they start curving to make an arched polytunnel. Domestic Gardening. A kit contains everything you need and materials that are optimized for growing plants. Gardening Naturally Black Modular Cloche Hoop Tunnel Kits 1. We carry a great line of hobby greenhouse kits in many sizes and configurations and we manufacture greenhouses ranging from small polyethylene covered seasonal retail structures to the permanent, polycarbonate greenhouses used by commercial growers. Mini polytunnels can be fixed to raised beds to create a compact growhouse, fixed to the ground with our peg system or used inside a full sized tunnel to create a heat retaining double glazing effect. Everything you need to improve or repair your polytunnel is available from Northern Polytunnels. polytunnel crop support. 5 litre container of Algon Organic. Material: Galvanised Z35 Steel Frame. Heavy Duty Direct From Manufacturer Full Kit (No Doors) $1,942. If using a pre-fab polytunnel kit, they will be provided. 00 Caterpillar Tunnel Kit. Instruction Manual. Quick Add. All our polytunnels use large diameter galvanised steel tubing with strong interlocking joints. 45 m, Transparent £33. Min Order: 100. In this video. 1m) All our polytunnel kits include: Ground Tubes, heavy-duty; All British Standard Steel framework; All steel fittings; Anti Hot Spot Tape; 5-8 Year UV Guaranteed Polythene cover (depending on which cover material you choose) Door Frame Timber and hinges/fixings; Includes base rail timber as standard. £149. The Quickcrop mini tunnel kit is a DIY kit for building a sturdy and long lasting mini polytunnel for plant and raised bed protection. Complete Mini Polytunnel Kit With Bird Netting Cover. Palram - Canopia | Americana™ 12 x 12 Hybrid Greenhouse. 90% of light is transmitted through the polyethylene and it stays warm much longer than a greenhouse. The Redpath domestic series Tunnelhouse offers the home-gardener a cost-effective solution to growing your veggies and nursery plants out of season. 80m wide x 2. 01-0731. £219. Yes, a drip system with 2 lines for 4 beds and including the necessary filter, fittings and pressure regulator is available for $485 for “The 105” and $345 for “The 55”. 95. Otherwise source water pipe or scaffolding pole off-cuts from your local building supply. 12m high 0. Your 4m Modular Greenhouse Polytunnel Kit includes: Galvanised steel poles for the endoskeleton 🏗️. What does a standard kit include? All ‘Premier’ polytunnels are supplied as a complete unit ready for assembly onto a soil base. SALE! $3,281. polytunnel 120. About the kit. As standard, they have proper inch thick galvanised poles, timber base rails, ground anchors that actually work and two hinged doors. Add to Cart. Commercial and Domestic Quality Greenhouses and Accessories. French beans, runner beans, sweetcorn, cabbage and bedding plants for borders all thrive under cover at the beginning of their growth cycle, ensuring your crops get off the a successful start. Polytunnels. 5m for the centre, mark it on the poly so it is easy to centre on the board. View More. 99. Was: £299. 18ft Wide X 54ft Long Large Commercial Heavy Duty Polytunnel Kit Professional. 74 £ 1,028 . C $35. 95 - £124. It comes complete with two extensions to allow ventilation. 1 OF 4. Polythene for covering the tunel and doors. Polytunnel Greenhouse vs. BRAND NEW 14FT X 30FT POLYTUNNEL KIT - HEAVY DUTY PROFESSIONAL GREENHOUSE - WD. We ONLY provide the steel frame, leaving you to provide your own table-top. 66 postage estimate. For “The Mini” it is 6 rows of drip and is $245. 14ft x 42ft Straight Sided Polytunnel Kit, Heavy Duty Professional Greenhouse. 18ft. Roll-Up and Drop-Down Sides enable four-sided. Polythene Care Kit contains 1 roll of 2 inch, 3 inch and 4 inch repair tape and a 20 litre container of Algon Organic. 14ft Wide Polytunnels. We have called upon our 35+ years experience in the horticultural industry to bring you a specialist polytunnel guttering system. These range. Garden Polytunnels are supplied as standard with a single hinged door at the front, which includes a top panel of ventilation net and a lower panel of polyth. Side Rail Kit (Right Side) Timber Side Rail Kit (Right side) £111. The cost of building your own polytunnel is a fraction of what a kit costs. Easy Build Double Door Fittings Pack. Head Room at 1ft in from Side: 5ft 2in. Add to basket. 18ft Wide X 24ft Long Large Commercial Heavy Duty Polytunnel Kit Professional. Birchtree Polytunnel (6 x 3 x 2 m) This large Birchtree Polytunnel helps create a protective environment for plants, covering an extensive area and keeping them sheltered from strong winds. Self assembly Polytunnel Kit from our Commercial Polytunnel range is available for D. All products. Polytunnels are so much better value than greenhouses. Whether you grow from earliest spring to late fall or run your production year-round, our season-extension supplies provide the versatility and durability you need to protect your crops from the elements. 10M wide Polytunnel Kit. If you wonder how to grow tomatoes all year round, using a polytunnel is an easy way out. The exception here is if you only have a small space. $18. Buying a polytunnel. Self assembly polytunnel kits from the Gardeners Delight range are available for the DIY enthusiast, all sizes available from polytunnelsdirect. A Storm Strengthening Kit is a very simple method of adding strength to a polytunnel. 57 delivery Jun 1 - 16. If you are growing in raised beds in your polytunnel, we have now added some drip irrigation kits and plans for the most common raised bed sizes. 8M (9’2″) wide x 2. Polythene is TRENCHED or buried in the ground around the tunnel. Polytunnel Greenhouse is an easy to setup structure with quick and easy installation. The Farmers Friend Caterpillar Tunnel kit brings the benefits of greenhouse production to your farm in an easy-to-assemble and affordable package. Hortitech Tunnel Houses are suitable for plant propagation, flower growing, vegetable production, hydroponics, animal shelters, storage, stables, hangers and shelter for virtually any purpose. This means that the sides are vertical for about 3 feet before they start curving to make an arched polytunnel. 4%. Side Rail Kit (Right Side) Timber Side Rail Kit (Right side) £111. The door has corner braces, and comes supplied with hinges and wood screws. Polytunnels come in all shapes and sizes, from small models designed for home gardeners to much larger tunnels which are meant for commercial use. Heavy-duty swinging door includes 8mm clear polycarbonate sheeting. It’s a solar watering system that needs no mains. Due to its thickness will be sturdier and last longer than the thinner and less pricey polytunnel exterior option. Starting at $13,805. 500+ bought in past month. Polytunnels are quicker to erect than glasshouses. Growing Crops in Polytunnels: The Variety of Crops is Huge As Is The Size of Tunnel. Our tunnels are available in a variety of sizes. The EasyGro range is our starter polytunnel which Includes high spec steelwork, polythene and commercial grade fittings. Compared with glass, tunnels have the following advantages. FarmTek offers the best customer service and most economical prices on products for the agricultural industry. With proper care, even a 5m2 garden tunnel will produce enough vegetables for the whole family. The kit comes with a 16mm OD (1/2” ID) commercial dripline, with pressure compensating emitters positioned every 30cm (12”) along the pipe to ensure even irrigation over three runs per side. We all love it when things come together… and this time we mean it literally. $93. I really like this as it gives more space to be able to plant taller plants towards the edges of the tunnel. Hoop spacing 1. We carry a great line of hobby greenhouse kits in many sizes and configurations and we manufacture greenhouses ranging from small polyethylene covered seasonal retail structures to the permanent, polycarbonate greenhouses used by commercial growers. Monstershop Polytunnel 25mm 3m x 2m. You can buy polytunnel kits, which include the door and frame. By BBC Gardeners' World Magazine. Quick Add. A polytunnel usually consists of a metallic, plastic, or wooden frame, covered with polythene or other similar materials. 5 out of 5 stars 3 Our polytunnel greenhouse range. Direct Polytunnels 14ft Wide x 18ft Long Conventional Polytunnel Kit All our Polytunnel Kits Include Everything you need to Start Growing FEATURES, SPECIFICATIONS & WHAT'S INCLUDED:. Shop our 10 ft high tunnel greenhouse kits. Mini polytunnels can be fixed to raised beds to create a compact. Tech Spec. Heavy duty polytunnel frame with zinc-rich hot dip galvanization coat for durability. R FIRST TUNNELS Dixon Street, Barrowford Lancashire BB9 8PL Telephone 012 8 2 6 012 5 3 Facsimile 012 8 2 612 4 2 0 Email sales@FirstTunnels. com By BBC Gardeners' World Magazine. Side Rail Kit (Right Side) Timber Side Rail Kit (Right side) £76. Greenhouse Panelized Kit. Mini Polytunnel kits and raised bed covers that can be attached to any raised bed or used directly on the ground. Double Doors and Door Frame for Garden Polytunnel From £130. Polythene Type: Professional Horticultural Industry Grade. Northern Polytunnels has become a household name that is synonymous with quality. polytunnel polythene . The cut flower business added several high tunnels to its existing four rolling greenhouses six years ago. Your polytunnel kit comes complete and includes all the steel structure, fixings, Anti Hot Spot Tape and an XL Horticulture UV guaranteed polythene cover. Sizes depend on the manufacturer, but as an example, they may be 6 x. View More. We warmly welcome you to wholesale high-grade small polytunnel for home use kit made in China here from our factory. Useful Extras. See Options. 01-0594. 7. View our range of fittings, support kits, doors, ventilations and more. Single Sliding Door Kit From £85. Complete Mini Polytunnel Kit With Mesh Net Cover. Delivery. Timber side rails are exactly the same as base rails, but these rails are placed around the polytunnel framework at the top of. The first and most important step is to lay the foundation tubes correctly. This type of greenhouse would falls into the category of what are commonly referred as multitunel, like Asymmetrical or Tropical and Gothic greenhouses. Buy it now. 25. 5 out of 5 stars 36. 6m. Our polytunnel staging kits are a low cost solution where a full length bench is required for your polytunnel. Direct Polytunnels Polytunnel kits direct from the manufacturer. Of course, there are exceptions to every rule. The kit comes with everything except a drill bit to drill the wood & some hinges. You can see what it looked like originally in this post. 48 Sale price. Delite Merchandise Co. Download Construction Guide - PDF;Components and Accessories. It can also enable you to grow fruits, vegetables, and plants out of season. Our polytunnel irrigation kits are overhead watering systems. Direct Polytunnels 10ft Wide Straight Sided x 24ft Long Polytunnel Kit All our Polytunnel Kits Include Everything you need to Start Growing FEATURES, SPECIFICATIONS & WHATS INCLUDED:. For the largest two polytunnels in the commercial collection – the 27ft and the 30ft wide – timber base rails are supplied to secure the cover and a triple ridge kit is included for additional strength. UV stabilised roof cover 180um. Polytunnels. If you wonder how to grow tomatoes all year round, using a polytunnel is an easy way out. 6ft Walk in Greenhouse. The polytunnel has fruit trees. The best way to water a polytunnel to reduce the amount of water lost through evaporation, is to water your plants early in the morning or in the evening, rather than during the heat of the day. At Premier Polytunnels, we manufacture high quality commercial and garden polytunnels, polytunnel accessories, cloches, fruit cages and sheep housing. UV resistant and highly adhesive, polytunnel tape is perfect for repairing tears in polythene covers. Proven to grow plants faster than the competition, our High Tunnel Greenhouse Kit comes with everything you need to start growing. 95 £79. The ground tubes are sometimes referred to as Foundation Tubes. A polytunnel is not a poor man's greenhouse, it is a tool that allows you to grow things more successfully than you ever thought possible. The kits are supplied with plenty of pipe and fittings for both sides of the polytunnel. View more detail about the polytunnel kit >> Available standard polytunnel kits sizes: Width: 10ft, 12ft, 14ft, 16ft, 18ft Length: 13ft, 20ft, 27ft, 33ft, 40ft, 46ft, 52ft. All products. We are also happy to answer any questions by email. . Large Polytunnels. 50. 1 - 2 Day Delivery Top Quality 30-Day Returns . Polytunnel Growing is a great alternative to greenhouse growing where funds are limited. Polytunnel greenhouses are a fantastic alternative to the far more expensive greenhouses made of aluminium and polycarbonate or glass. Free delivery in Wales. Large Outdoor Polytunnel Greenhouse with Heavy Duty Steel Frame, for Garden Plant Tomato Growhouse Hot House, 2m/3m/4m/5m/6m Long Walk in Greenhouse Tunnel ( Color : White , Size : 600x200x200cm ) $69518. Propagation Growing Kits & Cell Trays View All. Whatever your choice, our staging kits provide the ideal framework on. Ideal for both polytunnels and raised beds. This is the smallest one, the 8′ x 8′ Petite Greenhouse Panelized Kit. 95. Polytunnel Overhead Spray Irrigation, 20ft Long, 16ft Cover - £37. This means no future. Easy Build Door Aluminium Pack. Includes all the parts and supplies you need plus free shipping!Whether you’re a gardener, allotment owner or commercial grower Direct Polytunnels have the heavy duty, high-quality polytunnel kits you’re looking for. SECRET GARDEN | LITTLE ACORNS | BUSY BEES | DIG IT. . (3) Add to basket. It is clear and so will not diminish sunlight and should outlive the rest of the cover. See Options. . Quick View Lashing Strap Cam Buckle. Poly, Net, and Fleece covers available. Many customers build their tunnels over a weekend, but there are a number of factors that determine how long it takes – the size and specification of the polytunnel, digging conditions, weather, and DIY skills all factor into the time it takes. Our tunnels are available in a variety of sizes. Whatever the reason for the damage to your polytunnel cover, the good news is that repair is often possible. The hoop house range, includes outdoor structures that can be up to 20 meters long, by 5 meters wide. Easy Gro Polytunnel range comes in a variety of sizes as shown above and are available in 840g or 1000g Thermic Polythene. Shop great deals on Polytunnels Frames. Side Rail Kit (Right Side) Timber Side Rail Kit (Right side) £143. 41 postage. no timber. 00 1100 Series Hoop House Package. List of principal searches undertaken by users to access our English online dictionary and most widely. For our 12ft wide polytunnels, the. Polythene Repair Tape Greenhouse Polytunnel Clear Waterproof Heavy Duty. In my own polytunnel over the last few years I have grown a range of Tomato plants including the cherry tomato ‘Sungold’ the heritage ‘Super Marmande’ and the Hybrid ‘Gigantomo’ which still remains my favourite. These are premium garden polytunnels for growing and protecting your fruit and vegetables all year round. Download Construction Guide - PDF;A polytunnel can give some insurance against the vicissitudes of the British weather and can also help to reduce problems with pests if it is designed well and used correctly. Large Outdoor Polytunnel Greenhouse with Heavy Duty Steel Frame, for Garden Plant Tomato Growhouse Hot House, 2m/3m/4m/5m/6m Long Walk in Greenhouse Tunnel ( Color : White , Size : 600x200x200cm ) $69518. how to build a polytunnel . We're professional small polytunnel for home use kit manufacturers and suppliers in China, specialized in providing high quality products and service. You can buy complete polytunnel kits, which include the door and frame from around £300. Heavy duty polytunnel sizes: Widths: 20ft, 24ft, 28ft & 30ft Lengths: To your requirement. 3m Long x 33mm OD x 1. £82. The GrowSpan Gothic Premium High Tunnel Advantage includes: Ideal for just about any crop. Whats included in a Basic Polytunnel Kit? Your Order and Delivery; About Us; Contact Us; News; FREE Delivery in Wales* Kits only. Ferryman Polytunnels manufacture Quality easy to assemble Polytunnels for Garden, Allotment or Small Holding. Polytunnel Kits. Greenhouse Hoops $ 110. Compare the pricing by various brands in this way. We supply sufficient polythene to cover the doors chosen for your polytunnel kit. Greenhouse kits aren’t usually made with glass, which makes them an appealing option. See more ideas about. Used widely in the nursery industry in Australia as well as in home gardens. EXPRESS 1-2 DAY DELIVERY AS STANDARD. 7 yrs CN Supplier . FREE Delivery. POLYTUNNELS FROM DANCOVER Online sale of Polytunnels. They can also allow you to be more self-sufficient by increasing your yield and allowing you to grow more exotic varieties. More Info. Sliding Door Track 3. Heavy Duty Direct From Manufacturer Full Kit (No Doors) £799. The standard size for greenhouses is around 6 square feet. £39. View More. EUR 1,244. Close ×. Order online or contact. You can personalise your tunnel with many optional extras to ensure your Polyshadehouse matches your location and your crop growing needs. ie at a very affordable price. The kits contain 4 corner mounting brackets, 2 straight mounting brackets (except in the 4ft kit which doesn't require any), 2/3/4 cross piece connectors, and all the fixings needed to. Polytunnels Direct is an Irish Company and Fully Insured. 08 shipping. . Get 10% DISCOUNT off your new polytunnel and any other products from Direct Plants, by using my code LIZ10 at offerings include farm supplies, aquaponic, poultry supplies, agriculture products, animal housing, home improvement, commercial high tunnels and hoop houses, fodder. Polytunnels Direct is an Irish Company and Fully Insured. Wider ScopeBasic Principle: Build a wooden frame using 2 x 4 or 4 x 4 boards to the size of your Polytunnel’s base (so that the base frame rests in the center part of the wood throughout) Concrete corner and center stakes onto the ground, onto which you can fasten the frame. 00. 333 watching. A box with all the required fittings. If you're interested in erecting a polytunnel your. The framework sections are cut to size and polythene and netting is included so you can choose all netting, all polythene or half and half. VAT) Buy Now. Get it Thursday, 28 Sept. It is a straight-sided polytunnel. £34. £19. This can be especially beneficial for warmer climate crops to grow properly in our climate. 4m (13ft) wide polytunnel for residential & communal farming applications. 4x2 m, 1 m², Green/TransparentPolytunnel greenhouse 4x6,25x2,4m (7 pages) Greenhouse Kit Dancover GH82121 Manual. It works the same way a normal greenhouse made of glass would, by attracting and trapping the sun. This greenhouse is also great for extreme rains and winds. Buying a Polytunnel Kit. 5 stars. They can vary in size from ‘mini polytunnels’ to 12 foot structures to massive commercial polytunnels. Size.