Our most popular polythene cover incorporates an additive that increases its Thermic efficiency, yet still retains 90% light transmission. £39. Install the roof over the plastic sheeting. Also, the size of this particular small polytunnel is 6 feet long X 7 feet wide X 7 feet tall. . 10. Rigid plastic: includes polycarbonate and acrylic which do not last as long as glass but are incredibly difficult to break, polycarbonate which is stone proof. Secure the plastic film at the base using staples and screws. Polytunnel plastic will last for at least 4-5 years. The better the climate control inside the structure, and the better the. XL Horticulture are suppliers of the worlds most advanced polytunnel polythene, smart films and spectral filter polythene and the worlds most energy efficient SUPER thermic polythene. Simply select the length and you’re good to go. POLYTHENE IS. 99. 00. We sell by full sheet, half sheet, or cut to size. It has a life expectancy of up to 10 years and comes with a 5-year warranty against UV degradation. Even in winter, the power of the sun through the plastic can raise. How much does a polytunnel cost? Polytunnels are a much more cost-effective alternative to greenhouses. 90. The Glasshouse Company are manufacturers of. 45. Components and Accessories. i) Water – It’s essential to have a good, reliable water supply. Free delivery and returns on eBay Plus items for Plus members. 3 x 'T' 13mm connections. 98. 3m Long x 33mm OD Z35 High Tensile Galvanised Tube. The plastic allows early in-ground seed starting, the others work great for pest control and and shading during the scorching July weather. 27ft (8. 1) Each arch built up with an 'L' shaped piece at the bottom of each leg. 1m wide x 12m long. Staging Supports From £14. The use of Base Rails is a very popular option for covering a polytunnel. Avoid construction grade material that has less strength. Grow a variety of flowers, plants and vegetables in this 3x2 metre polytunnel by Garden Grow. 4-Tier Green 160cm Greenhouse - Polytunnel Poly Plastic Garden Plant Vegetable Mini Growhouse Tent Polyethylene Cover - By Harbour Housewares. This sounds. 6 Mil Greenhouse Plastics. Polythene / Netting Fixing Systems. Ferryman Polytunnels have been manufacturing high quality galvanised steel framed polytunnels, for the garden, allotment, commercially and schools, for over 35 years. Different shapes and sizes of polytunnels can be built, to create microclimates suited for different types of vegetation. Horizontal brace bars for 16ft polytunnels come standard with crop hangers and are approx $127. Mercia 6 x 6 ft Wooden Apex Greenhouse (0)The Advantages of D-Plant Polytunnels. 7m and polythene is trenched along the sides. Pull the polythene cover gently and carefully across the frame, making sure that the excess is distributed as evenly as possible around each side. View More. Our innovative technology allows for maximum efficiency with minimal environmental impact. These items can be purchased to extend or repair an existing First Tunnels Polytunnel, build your own Polytunnel from scratch or create a truly bespoke Pergola, Arch,. 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. Polytunnel Greenhouse Clear 25mm x 50m Polythene Repair Tape. GiantexUK Mini Greenhouse, Steel Frame Poly Tunnel Growhouse with PE Cover & Roll-up Zipper Door, Small Garden Green House for Plants. A single layer of polyethylene works well, but a double layer is ideal. A quality tunnel house will also shield your plants from inclement weather, pests and predators. Peppers and aubergines can also be grown up strings if you wish, there is a tradeoff between space requirement and extra work. Our Polytunnels sizes include: 10 foot x 20 foot. Snapa Clear C Sections. Hoop Houses polytunnel uses a series of hoops to support the plastic covering. 8m) wide so you have enough room to move around; 8ft (2. Due to modified conditions, there is betterWholesale polytunnel plastic can be bought here at some of the most affordable prices on the market. There are many gardening tricks to guarantee a better yield. The eaves should be at least 5ft (1. The polythene we stock is from a range of 'Visqueen' films that are manufactured using the latest technology, binding three separate layers of polyethylene together to produce an extremely strong and durable cover. Although green plastic cover is widely used for greenhouse, it filters out green light. All the polytunnel covers that we supply have a 5 year guarantee against UV degradation and. The average home garden plastic tunnel can be used to grow cool-weather crops from autumn into winter and from winter into spring. It is a good choice for seasonal greenhouses, overwintering structures and high tunnels. Shipping. Polytunnels are a type of greenhouse that are used to grow plants in a controlled environment. Generally speaking, poly bags are made from polyethylene, one of the most popular types of plastic packaging formulations today. 5m for the centre, mark it on the poly so it is easy to centre on the board. Crops Suitable for Polytunnels. At Premier Polytunnels, we manufacture high quality commercial and garden polytunnels, polytunnel accessories, cloches, fruit cages and sheep housing. Our polytunnels are some of the strongest and most durable garden tunnels available in Ireland and the UK. Their maintenance is easy but life is less than polyhouse and has comparatively higher temperature inside the structure due to less. FREE delivery Tue, Oct 24. 5 cm layer of soil, in the middle of March. Iwinna Polytunnel Greenhouse Clear Polythene Repair Tape (25m x 100mm) 233. $25 Easy 5×5 Greenhouse from Instructables. CONTACT. 00 Sale. £. 0302 lbs per square ft. Mercia 8 x 6 ft Traditional Apex Greenhouse Combi Shed (0) £1,300 . Are you sitting comfortably with a cup of something nice, if not this is where the free tea bag provided with your First Tunnels Polytunnel will come in very. Clamps, Clips and Fastenings. 5mm Wall Thickness Z35 High Tensile Galvanised Tube As used to manufacture all our Polytunnel kits. Poly Tunnel Frame Size Range: Pro+ Range: 3m x 2m, 4m x 2m, 4m x 3m, 6m x 3m & 8m x 3m. Click What's In The Kit for details. We offer full range of plastic sheets, rod, and tube material at competitive prices. A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape. In terms of pest and disease control, Ray notes that “fungal sprays are no longer. 6m x 3m (19ft 8in x 9ft 10in) Premium Polytunnel Galvanised Frame by New Leaf™. Horizontal brace bars for 12ft wide tunnel approx $72 per bay plus freight. At JF McKenna we design, manufacture and supply a wide range of domestic and commercial polytunnels, with polytunnels to suit the small gardener to the professional grower. 99. 1 m plenty for the door and head height. If you need further assistance with your project we. 5 out of 5 stars 430. 81 to EUR 89. The Barkers have observed tunnel crops to be earlier by as much as three weeks, and their use boosts the farm’s output of Grade 1 fruit by about 20 per cent. It is ideal for growing many vegetable crops such as tomatoes, peppers, cucumbers, and melons. Can be retrospectively fitted to an existing polytunnel. Step 7: Install the roof. 100+ bought in past month. A more in-depth analysis of building a. 4 Options From £29. 99. 2. Peppers and aubergines can also be grown up strings if you wish, there is a tradeoff between space requirement and extra work. 2m, 11. Transparent plastic cover: the tough, durable and transparent PE plastic cover protects plants while allowing nourishing sunlight to pass through, the cover can be easily attached to the frame with the included tethers and single-sided tape; The 8 roll-up windows have mesh netting to allow for cross ventilation and climate control. Garden Grow Tunnel 6x3m. Poly Tunnel Plastic (2040 products available) New style Transparent poly tunnel UV resistance agricultural 200 micron greenhouse plastic film roll $2. Firstly, you need to ensure that you’re getting the right cover for your polytunnel in terms of thickness. Larger items may be sent direct from supplier. Sorry but it's true. 99$14. Greenhouses are seen in use for most vegetables and other reserved crops. Like the thermal anti-drip option, this polythene is available to buy by the metre. 00. 98. In my 10-foot-wide tunnel, I. In today's episode, I show you an EASY, CHEAP way to build a mini poly tunnel / Cold frame at home. 10m on a roll and available in two widths – 50mm and 100mm. PLEASE ENSURE YOU USE THE CALCULATOR PROVIDED. A 24 to 36-inch (60-91cm) tall plastic tunnel can be used to grow broccoli, Brussels sprouts, and cabbage. There are two common approaches to keeping a polytunnel warm: Retaining daytime heat. 5mm Wall Thickness Z35 High Tensile Galvanised Tube As used to manufacture all our Polytunnel kits. 4-Tier Green 160cm Greenhouse - Polytunnel Poly Plastic Garden Plant Vegetable Mini Growhouse Tent Polyethylene Cover - By Harbour Housewares. Mini Polytunnel kits and raised bed covers that can be attached to any raised bed or used directly on the ground. Polytunnel. Domestic polytunnel. Just keep in mind the cost associated with doing so. A base rail is the easier way, particularly if there’s not enough space around the polytunnel to dig out a trench. 50. Unit. Head Room at 1ft in from Side: 5ft 4in. 100s of help & advice articles. The work required will depend on how you intend to use the space. Outsunny 6 x 3 x 2 m Polytunnel Greenhouse Pollytunnel Tent w/ Steel Frame White. A simple way to do this is to secure a rope close to the edge of the. Constructed from durable polyethylene, this green polytunnel connects with ties for easy assembly and stronger, longer lasting life span. It should be about an inch thick. Crops Suitable for Polytunnels. Step 9: Plant seeds. Whether you're looking for a timber or polycarbonate structure, read on for our tips to find the perfect greenhouse on a budget!Hot spots can degrade the polythene plastic over time. One low-cost method of accomplishing this is to use low tunnels. US $3. 95 £79. Condensation issues in polytunnels can be resolved by installing Thermal Anti-Fog covers, which effectively reduce moisture. Distance Over Hoop: 19ft 10in. 3663602429005. Polytunnels are usually shaped, as the name implies, like a tunnel. • Our tunnels have very good head clearance right out to the sides giving ample. Contact 01282 811250 today! Manufacturing and Building Polytunnels, Greenhouses and Canopy Structures in Ireland for over 48 years! We believe in supplying and building for our customers a quality product that lasts a lifetime. Polytunnel plastic is rated to last for 5 years. Rough weight of this Greenhouse Plastic is . Details on how to measure your tunnel below. View More. Allow 2-6 working days for receipt of goods. 99 £69. Inhibits fungus spore development for healthier plants. Read More. Pro Max Range: 4m x 3. Polytunnels often have lots of headroom so are ideal for cordon crops such as tomatoes and cucumbers. To assist with pollination. 12 foot x 20 foot. A 10ft wide polytunnel is a popular choice for home gardeners and allotment holders. Size. Copolymer poly is a low-cost material that is good for one season. 8m(800G) 9m(800G) 11m(800G) 12. Polytunnels are pop-up plant protection tunnels, usually made from plastic hoops that suspend a layer of horticultural fleece over the plants. A premium grade UV Tolerant greenhouse bubble insulation – this is not to be confused with cheap bubble wrap used for packaging. PLASTIC PVC PE GREENHOUSE GROWHOUSE COVERS & FRAME GARDEN PLANT GROW STORAGE BAG. An industrial strength tube ideal for adding extra supports or creating structures within a polytunnel. 99. Add to cart. We supply sturdy tunnel houses for NZ’s unpredictable. Today we put the cover onto one of gary from @Geordiegiantveg polytunnels. Creating a heat source inside a polytunnel. Low tunnels are temporary structures that are approximately 4 feet tall and 3 to 6 feet wide. An industrial strength tube ideal for. It is ideal for growing many vegetable crops such as tomatoes, peppers, cucumbers, and melons. SPONSORED. UVI Five Year Tunnel Polythene Sheets We also supply new polytunnel covers for any tunnel or DIY structures. It can even last up to 10 years in some cases. A polytunnel is a tunnel-like structure that first appeared in the 1960s. Protect Your Plants. This kit includes 6' Wiggle Wire bundles and 6'-6” bundles of Aluminum U-Channel Base sections with self-drilling center groove guides. Thinner thicknesses can be too flexible and. You may wish to secure it with bricks or rocks. Our in-house design team are always innovating new products using the latest state-of-the-art 3D computer modelling system and structural analysis software. Extend Your Growing Season. Polytunnels are so much better value than greenhouses. Please contact us to order. 2 out of 5 stars $14. We have fixed widths of covers, please note that certain covers have limited widths available and selecting one of these may result in. 99. With proper care, even a 5m2 garden tunnel will produce enough vegetables for the whole family. Make sure your soil is kept moist, not too dry and not too wet. Polytunnels are essentially the more cost-effective and versatile equivalent of a greenhouse. Minimising wastage and maximising your yield potential, our industry-leading growing systems also enable you to forecast with greater accuracy, and so build strong relationships with customers. 5 cm layer of soil, in the middle of March. 5m) tall to let in plenty of light. Save 5% with voucher. Polytunnels are basically large-scale cold frames, giving growers more area to protect to extend the growing season. An 18 to 24-inch (45-60cm) tall plastic tunnel will accommodate lettuce, spinach, and other salad greens. . Variety of applications: fabric greenhouse shading, vegetable garden shade, general shade cloth for home, pergola and garden. 2x timber framed, hinged doors. Greenhouses and polytunnels are permanent or semi-permanent structures made of transparent material such as glass or plastic that protect plants from the cold and wind. We supply high quality thermal anti-drip polytunnel replacement covers. 4 Options From £29. A polytunnel can open up a world of possibility for your garden. This gives it one of the most robust frameworks on this list capable of withstanding fairly harsh winds and. Roll the plastic on the roof of the polytunnel. Max out your farm with the thickest gauge steel Caterpillar Tunnel on the market! We now offer a 16-ft wide tunnel (up from 14 ft) with 40% thicker, 14-gauge steel bows (up from 17 gauge). Acts as a mini greenhouse. P Clips can also be used as a universal fixing method for the easy attachment of timber, wire supports, or anything else you might want to attach to the metal polytunnel frame. 9%. I was excited to erect this as I have neve. Once the triangle pieces were built, they were covered in polytunnel plastic. 5cm tubes were too thin for my exposed site. A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape. Keep in mind, the longer the polytunnel, the more it will need to be braced for additional support. Quonset, Polytunnel & Hoop House Ideas. The support for the headboard is about 2×6 ×17 inches in dimension. 24′ Wide Greenhouse → 38′ Wide Plastic; 30′ Wide Greenhouse → 44′ Wide Plastic; 40′ Wide Greenhouse → 52′ Wide Plastic; CUSTOM GREENHOUSE COVERS. we bought the cover from one of the plastic retailers who is local to us. Repair Tape - 50mm From £3. Buy Plastic Greenhouses & growhouses at B&Q 1000s of DIY supplies. Getting started; Poly Tunnel Plastic Sheeting; Poly Tunnel Plastic Sheeting - China Manufacturers, Factory, Suppliers. Steel Frame Poly Tunnel Steeple Greenhouse - Green. 00. FREE delivery Tue, 3 Oct on your first eligible order to UK or Ireland. A quality tunnel house will also shield your plants from inclement weather, pests and predators. We offer a variety of Steel Hoops available in different widths. 2 x 6M Heavy Duty Polythene Sheeting, 125Mu/500g Extra Thick Plastic Sheeting Clear Garden Grow Polytunnel Cover Plastic Dust Sheet, Garden Grow Polythene Cover Sheets for Greenhouse, Polytunnel. The chamber dimensions for the 1808-28 shrink tunnel are 18"Wx 28"L x8"H. Ventilation Ventilation is essental for 2 reasons: To keep airflow going so that the tunnel doesn't get too damp in winter or too hot in summer To assist with pollination The tunnel houses you can buy have. Recently I figured out how to make some secure clips that won't come loo. £19. 00. Please feel free to contact us on 01282 811250 or by e-mail if you are. Greenhouse Plastic. The 6 mil plastics are often cut-to-order, but there are often a variety of Pre-Cut 6 mil sizes available. A 24 to 36-inch (60-91cm) tall plastic tunnel can be used to grow broccoli, Brussels sprouts, and cabbage. Acts as a mini greenhouse. • Low tunnel technology is mainly used for producing healthy and. 5 out of 5 stars 4. BIRCHTREE 6M (L) x 3M (W) x 2M (H) Polytunnel Greenhouse Pollytunnel Poly Polly Tunnel Fully Galvanised Anti Rust Steel Frame 6 Section. Asked about his favourite spot in the gardens, Nick said: "The greenhouse and poly tunnel are great on a wet cold day, a good day of digging in well rotted farm yard muck on a. Some vegetable crops are much more sensitive to soluble salts than others. Fasten the Polytunnel frame to the wooden frame. 2: Closed plastic poly tunnel. No wonder it has made it to the top of our list of the best polytunnels for an allotment or garden on a budget. Stick that above the plank, bend the poly you are attaching to meet it. They can fit within many gardens and other growing spaces while still offering a good amount of space for growing food. 6m x 3m (19ft 8in x 9ft 10in) Premium Polytunnel Galvanised Frame by New Leaf™. Polytunnels are less expensive…. Polytunnel covers are always a major aspect of any farmers or green fingered gardener’s horticultural range. The triangles were pieced together and held in place with screws, starting at the bottom. Once the frame of your raised bed high tunnel has been erected, cover it with a sheet of 6-mil plastic. A&A Green Store Greenhouse Polyethylene Cover – Highest Light Transmission Polytunnel Plastic Sheeting. Min Order: 400. 85m above the ground. Polyethylene: The chemical name is polyethylene, which is a semi-crystalline thermoplastic material used to make PE. Mano Mano. I built 2 for around £30 in total. Greenhouses and polytunnels: make the right choice. Allow at least 1 to 2 feet of space in between staples and screws. High Tunnels are similar to hoop houses but are taller and are mostly used for commercial crop production. 5m Polytunnel Cloche Mini Garden Greenhouse SeedlingCloches are glass or plastic domes or square structures that fit over individual plants. “Blowing air between layers creates an air pocket that acts as insulation,” says DeVore. Buy our UV-stabilized clear 6 mil greenhouse plastic sheeting with a 5-layer film technology that provides additional strength and longevity. The metal band that binds the bristles or hair of a brush to its handle. Versatile Polytunnel Frame Only We understand that nothing lasts forever. 90. We supply UK manufactured polytunnels to farms, domestic growers, large garden centres and commercial users throughout the World. 4 year 6 mil Greenhouse Plastic is the most commonly used type of covering option for long term installation purposes. 99. In terms of materials, polyethylene and polyvinyl chloride must be different. 12. 20 full jet spray bits (50 piece contractor pack at Bunnings - you'll find a use for the. They are also a great way of trying your hand at growing vegetables, as well as introducing children to the joys. Tomatoes need a germination temperature that remains between 25ºC and 27ºC, and 20ºC after they have emerged. Designed to insulate your greenhouse from the frost and cold that winter brings. It is miniature structure, which produces greenhouse-like effect. We are a family and owned company - we care about the products and services we offer you. Crops Suitable for Polytunnels. 45m x 3m x 0. AU $104. The seeds are sown in rows, covered with a 0. Advantages and benefits of our greenhouse plastic: Our greenhouse is U. They are a steel framed, elongated semi-circular garden tunnel structure that has a polythene cover. Instead of a rope system, the structure is secured by metal base and hip board, side-braces, and purlins. $50 Hoop House from The Door Garden. 8m wide x 0. This is misleading. 10m - €17. 17. 3 x 90 degree 13mm corner connections. 24" Diameter Plastic Hula Hoops (pack of 12) 3 Panel Weather Station 32 Inspirational Quotes 40 Benefits of Having a Pet 5 x 10 Sandbox Kit (Seats, Cover, Box) 50 Bird Species and the Sounds They Make 6 Foot Landscape Timber with Spikes Kids Need Playgrounds 8-Feet Diameter Kaleidoscopic Merry-Go-Round 8 Foot Spiral Tube Slide by Sii,. 13. At the end of the season, carefully disassemble the DIY polytunnel and store away until the next growing season. By capturing and retaining solar radiation, these tunnels are an awesome tool to have. We supply high quality thermal anti-drip polytunnel replacement covers. . Your body frame must measure 8- inches in height and 76 inches. This way, they enable you to grow plants that would normally flourish in more temperate regions, to grow things out of season, or to protect plants that wouldn’t otherwise survive outdoors due to bad weather. 99. They are made very. 60-$5. Secures easily with Spring Lock Channel and Wire, and can last more than 4 years if installed correctly. Christmas. 50 per running meter. $ 2. In simple terms the diffused polythene helps trap and preserve higher temperatures inside the structures for much longer - in heated structures, a 15-20% fuel savings can be achieved. We can provide you with presized rolls of clear UV resistant exterior poly and anti-condensation interior poly coverings. That is the large walk in frame tunnels covered in plastic sheeting for growing a wide variety of crops from. 65% on a sunny day and 81Wh and 0. Straight Side: 3ft 6in. 5m. 4m long giving a ridge height of 2. 69 postage. 0 out of 5 stars 86. 34 watching. Great fillable sandbags for. These include foundation tubes, steel tubes, complete accessory kits, specialist clamps and basic fixings & fastenings. £23. Clear plastic polytunnel covers are made from high-quality 150mu (600 gauge) polythene which is tough and long-lasting. Screwing the Channel to Metal. I built 2 for around £30 in total. 92. That is the large walk in frame tunnels covered in plastic sheeting for growing a wide variety of crops from. 0 square meters. Peppers and aubergines can also be grown up strings if you wish, there is a tradeoff between space requirement and extra work. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside. 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. Polytunnels usually have an elongated shape, strongly resembling a tunnel. 5x17m) and they served me well except that their 1in/2. . Lightweight, sturdy and with walls constructed from polyethylene the 3m Poly Tunnel has been designed to give your plants, herbs and seedlings a localized micro climate of their own. The metal ring which holds a chisel blade's tang to its handle. The structure provides physical protection of the crops against winds, rain, snow and other natural hazards. Many of these items can also be used on. Plastic Poly Tunnel stock photos are available in a variety of sizes and formats to fit your. Shade fabric is used for heat and sun protection and creates a cooler environment for your plants. WAIZHIUA 2m x 3m Heavy Duty Polythene Sheeting 125Mu/500g Extra Thick Plastic Sheeting Clear Polytunnel Cover Plastic Dust Sheet for Greenhouse, Polytunnel, Farming, Painting Work. Despite the sheltered position it has split a little in some areas and gone green because it's not cleaned often. 120 square ft. Distance over arch (A) = 5. The same cross piece is used at the gable end of the tunnel as they feature blunt ends which won't tear the polytunnel plastic. We are the leading polytunnel manufacturer in the UK and, by buying direct from ourselves, you get a far higher quality product at a much lower price compared to buying from a high street or. Where outdoor structures are concerned, they can eventually succumb to the effects of adverse weather conditions. 91 postage. A high tunnel or hoop house, on the other hand, does have endwalls, doors, and sidewalls. We have a wide range of horticulture materials for sale including greenhouse plastic, anti-bird netting & more. 99 to £78. Height/Length: 200cm. Polytunnels are 2–2. Once erected they will be there for several years, so check out my tips before buying. Call 1-800-234-3368. BRAND NEW 14FT X 30FT POLYTUNNEL KIT - HEAVY DUTY PROFESSIONAL GREENHOUSE - WD. Prolongs the growing season. Our polytunnel structures are all. The original cover was seven years old, not bad for a poly cover. We even provide a Growing Pack to help you start growing straight away. I got the frame cheap s/h (£100) and the plastic was another £200 new so it is a cheap way to make a large dry space. a long, curved plastic structure that plants are grown under in order to protect them from the…. 60/meter) £14. Poles go in the ground, approximately 10 – 20 cm deep. 800 guage semi opaque plastic. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside. 5 m height protected structures made for commercial cultivation of low growing crops in off-season to get higher market prices. 00. 32 - $2. For a 3 foot wide tunnel you will need a meter of tubing. Material. Besides not being expensive, it is easy to construct and dismantle. Steel Diameter: 28mm. I have used polytunnels since 1983 when I bought 3 of 18×55 feet (5. Polytunnel & Canopy Covers. Copolymer poly is a low-cost material that is good for one season. With your polytunnel build complete, you can prepare the interior ready for planting. The tubes are 4 feet apart. They continue to become more popular each gardening year. If trenching the cover, making sure to pierce it in the bottom of the trench to prevent waterlogging around the polytunnel, otherwise, affix the cover to the base rail. High quality Polytunnel Sri Lanka Colombo Steel Frame Greenhouse Single Span from China, China's leading Polytunnel Steel Frame Greenhouse product, with strict quality control Single Span Steel Frame Greenhouse factories, producing high quality Sri Lanka Colombo Single Span Greenhouse products. $16. Step 8: Fill the greenhouse with soil. I would recommend something that you can leave open all the time.