Plastic also raises humidity so is ideal for crops like celery which loves it. Polythene repair tape is excellent for repairing tears in polythene sheets on polytunnels, cloches and can also be used to repair cracked panes in greenhouse. . Acts as a mini greenhouse. You can consider using mini polytunnels , row covers, bubble wrap, horticultural fleece or other fabrics, or even simple cloches made from. Due to modified conditions, there is betterWholesale polytunnel plastic can be bought here at some of the most affordable prices on the market. 0 ton. Allow at least 1 to 2 feet of space in between staples and screws. As a manufacturer of steel pipes, we have. The photos show a repurposed garage or sunroom converted to a growing area with insulation, heating, double pane windows or UV-filtering film and a shade system. Made with clear film with no slits or holes for maximum. Polytunnel Repair Tape. Generally speaking, poly bags are made from polyethylene, one of the most popular types of plastic packaging formulations today. Together with the Construction Guide, our customers receive a detailed ‘Polytunnel Parts Check List’ to help them identify each polytunnel part. Large Polytunnels Small Polytunnels Polytunnel Accessories Polytunnel Covers Polytunnel Spares Popular Searches 4x4 Greenhouses 6x4 Greenhouses 6x6 Greenhouses 8x10 Greenhouses 10x8 Greenhouses Sheds & Storage Logstores Wooden Logstores Metal Logstores Sheds Wooden Sheds Plastic Sheds Polytunnel Cover/Sheeting | Clear Polythene Greenhouse Tunnel | 7. Polytunnel Cover, Clear Greenhouse PE Plastic Sheeting, Thick Garden Grow Cover Sheets, Greenhouse Film, Horticultural Membrane, DIY Cover for Gardening Insulation,. It also enables interior climate control. Secure the plastic film at the base using staples and screws. Standing 26” wide by 31” tall, the. ie Web: type of plastic has light transmittance of 88%. When you run a heater in a single-poly tunnel, you heat the air, and that hot air goes right through the plastic. POLYTHENE IS. View More. Components and Accessories. 3m x 2m (9ft 10in x 6ft 7in) Premium Polytunnel Galvanised Frame by New Leaf™. Poly Tunnel Garden Cloche 3m x 1m Net Tunnel 2m x 1m Net Tunnel 3m x 1m Net Garden Cloche 1. 5m - €20. Can be retrospectively fitted to an existing polytunnel. 99 to £78. Polytunnels are a type of greenhouse that are used to grow plants in a controlled environment. 3m Long x 33mm OD x 1. 5cm tubes were too thin for my exposed site. Polyane consists of a 3-layer transparent film which will last for many years. Placing a single path down the center of a polytunnel between two beds when it is wider than eight feet can make it very difficult to access the backs of the beds. This extra heavy-duty plastic can be used under concrete slabs as a vapor barrier and on top of freshly poured slabs as a curing blanket. Learn more. Customise your 30ft wide polytunnels with lots of additional options available such as length, cover type, irrigation, ventilation, door type and much more. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside. 45 per running meter. Perfect for new polytunnel builds or as replacements for an existing polytunnel system, all our covers are made with polythene for its thermal, weather resistant qualities. ii) You can water by hand, or use a drip and trickle irrigation or sprinkler system. I already have a hanging shelf (made with leftover polytunnel plastic sheeting and scrap wood) and a trellis (on which I string milk bottles for additional container growing. 2 out of 5 stars $14. I have used polytunnels since 1983 when I bought 3 of 18×55 feet (5. Now, I have added wood pallet shelves as another vertical gardening technique. To Build A PolytunnelA video guide on how to build a polytunnel, taking it step by step from prep. 99. iii) Water once a week during early spring and. Polytunnels can be large enough for a person to walk through, or they can just cover your plants and crops, so they take up too much space, and gardeners can check their plants, vegetables or fruit. Get started today!The plastic sheeting that covers polytunnels affects heat retention, too. We built it using raised beds as a base,. . 2: Closed plastic poly tunnel. It is ideal for growing many vegetable crops such as tomatoes, peppers, cucumbers, and melons. You can choose from eight standard widths with the length starting from 10ft (3m). 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. 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. It’s usually made from a semi-circular metal frame that spans the length of your garden. 3m, 9. 25m x 1. Plastic also raises humidity so is ideal for crops like celery which loves it. The metal ring which holds a chisel blade's tang to its handle. £219. Add to basket. Plus when you need to open to weed or water and harvest just roll plastic up to. Snapa Clear H Sections. Constructed using powder coated steel frames covered with a waterproof PE protector, this polytunnel is durable and easy to construct. You will also need to factor in the cost of having a. • All our tunnels have a 5 year polythene with an ultra violet light inhibitor, to protect from break down by the suns rays. 5 cm layer of soil, in the middle of March. 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. It’s quite simple. One of the best things about polytunnels is how easy it is to customise them to suit your specific needs. 5x17m) and they served me well except that their 1in/2. . For the most part, are clear or transparent bags made of plastic most commonly used for packaging and shipping specific consumer products. 99. Note that green polytunnel covers do not let enough light permeate through the tunnel. Details on how to measure your tunnel below. This tape is transparent allowing light transmission and is UV stabilised making it resistant to weathering and will normally outlast the polythene cover. Pro Max Range: 4m x 3. First Tunnels range of polytunnel covers are durable and manufactured with the best materials to ensure they are durable and long lasting. Our greenhouse company is specialized in greenhouse farm , hydroponic equipment supplies, plant nursery and etc. Our standard polytunnel includes: 33mm diameter galvanised steel frame with 2. 99. How To Build A Polytunnel (using a kit). Now, I have added wood pallet shelves as another vertical gardening technique. Our polytunnel structures are all. Add to Cart Compare. AU $30. Creating a heat source inside a polytunnel. 4. . VonHaus Polytunnel Greenhouse - Walk-In Polytunnel Tent with Steel Frame. This black/white polytunnel polythene film is an 800 gauge/200 micron film designed for polytunnels that are used as animal housing or storage units. 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. FREE delivery Tue, 3 Oct on your first eligible order to UK or Ireland. Larger sized poly will ship via LTL (less than truck load) Motor-Freight. Crops Suitable for Polytunnels. 10. 16 shipping. Size. However, It is not uncommon for polytunnel plastic to last longer, with some reaching around 9 years. If you are cutting from a longer roll of plastic, be sure to leave 2’ extra on each end to allow for attaching to the end walls. Our calculator selects a width of polythene that spans the distance over polytunnel hoop (C) adding excess to accommodate enough material for burying in a trench (additional 2m) or fitting to base rails (additional 1m). Made with clear film with no slits or holes for maximum. save money, be healthy. We supply sturdy tunnel houses for NZ’s unpredictable. 593m Long x 33mm OD Z35 High Tensile Galvanised Tube. 2x timber framed, hinged doors. 8m(800G) 9m(800G) 11m(800G) 12. Or fastest delivery Tomorrow, 1 Oct. 5m is commercial Polytunnel insulation used throughout the country. 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. 4mm or diameter 38. 19 £ 4 . Or a combination of the above. Nationwide Delivery CALL US: 087 2456553 or 087 9417600 or email: yvonneronanegan@gmail. 4-Tier Green 160cm Greenhouse - Polytunnel Poly Plastic Garden Plant Vegetable Mini Growhouse Tent Polyethylene Cover - By Harbour Housewares. The chamber dimensions for the 1808-28 shrink tunnel are 18"Wx 28"L x8"H. If fencing in your garden isn’t an option, using polytunnels to protect your veg is the next best thing. £83. Perfect for new polytunnel builds or as replacements for an existing polytunnel system, all our covers are made with polythene for its thermal, weather resistant qualities. To calculate the size of polythene or net sheet needed for your replacement polytunnel cover, please enter the information to the right and click 'Calculate'. Full-text available. Sheet The Polytunnel Correctly. Features a heavy duty reinforced polyethylene cover, two zippered roll-up windows, & doors. Look, I’ll fess up if you will too. Here are some commonly used types of polytunnel covers: Clear polyethylene: This popular type of plastic polythene is commonly used for general purpose growing, this clear covering, is durable, UV resistant, and allows maximum light transmission, making it an ideal choice for growing a wide variety of crops. 1808-28 Shrink Tunnel - A high-speed shrink tunnel made for medium to high-speed shrink wrap applications. The base should touch the ground to allow maximum adjustment if needed. They are created from the sun’s heat, causing a rise in the temperature of the metal framing. We produce steel pipes and profiles - welded, also in galvanized version, as well as foil tunnels (professional and hobby ones), garage tents, gates and fences, made with non-welded method. View More. Garden Hoop Grow Tunnel Frame Kit - Small. Free postage. 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. Mercia 8 x 6 ft Traditional Apex Greenhouse Combi Shed (0) £1,300 . 5m for the centre, mark it on the poly so it is easy to centre on the board. we bought the cover from one of the plastic retailers who is local to us. This makes transparent covers a much better option. 95 £79. Adjust the plastic so it will create a tight seal on the roof and sides of your polytunnel. They are made very. 5 x 2 x 2 m Large Galvanised Steel Frame Outdoor Poly Tunnel Garden Walk-In Patio Greenhouse - White. 3. Broccoli, squash, and tomato are moderately salt tolerant. Supplied as a complete unit ready for assembly onto a soil base and includes ALL of the following: An all-steel framework – made using LARGER diameter. Northern Polytunnels has become a household name that is synonymous with quality. UVI Five Year Tunnel Polythene Sheets We also supply new polytunnel covers for any tunnel or DIY structures. Protecting crops from pests and adverse weather, our polytunnels optimise climate conditions for your specific environment and needs. Price is a fair bit more than budget picks. £. Get started today!Step 7: Cover With Plastic. Get the best deals on Polytunnels Frames. 4m long giving a ridge height of 2. Buy Plastic Greenhouses & growhouses at B&Q 1000s of DIY supplies. Although primarily used by gardeners and commercial growers for growing vegetables, fruits, and flowers, they can also be used to house livestock, or for storage. 7m and polythene is trenched along the sides. 150 micron replacement plastic covers for greenhouse poly tunnel / plastic film sheet for agriculture farm $1,850. We have a wide range of horticulture materials for sale including greenhouse plastic, anti-bird netting & more. The support for the headboard is about 2×6 ×17 inches in dimension. 9%. Prolongs the growing season. 3m Long x 33mm OD Z35 High Tensile Galvanised Tube. Free standard delivery on orders over £75. Pull plastic over the tunnel. Constructed from durable polyethylene, this green polytunnel connects with ties for easy assembly and stronger, longer lasting life span. The structure provides physical protection of the crops against winds, rain, snow and other natural hazards. 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. Step 8: Fill the greenhouse with soil. £39. Search from Poly Tunnel stock photos, pictures and royalty-free images from iStock. Delivery. Fasten the Polytunnel frame to the wooden frame. To do this, dig a trench all around (30 cm deep) and cover the material with dirt. We offer a range of spare clamps, clips and fastenings for our full range of polytunnels. Look, I’ll fess up if you will too. 8m(800G) 9m(800G) 11m(800G) 12. Many of these items can also be used on. Low tunnels are temporary structures that are approximately 4 feet tall and 3 to 6 feet wide. 3m x 2m (9ft 10in x 6ft 7in) Premium Polytunnel Galvanised Frame by New Leaf™. The work required will depend on how you intend to use the space. If you are cutting from a longer roll of plastic, be sure to leave 2’ extra on each end to allow for attaching to the end walls. We use superior materials in our products to achieve this: - Tanelith E treated timbers for outdoor use. 90% of light is transmitted through the polyethylene and it stays warm much longer than a greenhouse and does not suffer from wild fluctuation in temperature. It is framed with steel and is generally made of crop bars, base rails, and a plastic polythene cover. The seeds are sown in rows, covered with a 0. Zippered panels can be opened to vent excess heat on sunny days or to permit access when tending to plants. Gardman 7624 poly-tunnel with reinforced cover & Windows. AU $104. . Clear plastic polytunnel covers are made from high-quality 150mu (600 gauge) polythene which is tough and long-lasting. CHECK LATEST PRICE. 1x 5 Metre Clear Vegetable Fruit Polytunnel Grow Tunnel - Steel Frame Garden Greenhouse Plastic Poly Tent - by Harbour Housewares 3. The Range. 5 out of 5 stars 430. 12 foot x 20 foot. Pro-Gro Mini Poly Tunnel – 2m long x 0. AU $2,522. First Tunnels range of polytunnel covers are durable and manufactured with the best materials to ensure they are durable and long lasting. Our eternal pursuits are the attitude of "regard the market, regard the custom, regard the science" and the theory of "quality the basic, trust the first and management the advanced" for Poly Tunnel Plastic Sheeting, Green House. You will get some condensation, but you will need to water your plants as well. McGregor greenhouses come with a weather-resistant polyethyene cover and can be moved easily around the garden. 0 out of 5 stars $99. Save 5% with voucher. 99$14. (Drawn by Vince Giannotti) Figure 2. That is the large walk in frame tunnels covered in plastic sheeting for growing a wide variety of crops from. This post provides a list of tools and. There are two common approaches to keeping a polytunnel warm: Retaining daytime heat. Polytunnels are usually shaped, as the name implies, like a tunnel. Build an easy cannabis polytunnel: Poles and hoops. Super Cloche Strawberry Protection Cage with Bird Netting - 2. 00. 45m x 3m x 0. 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. Current lead time is approximately 14 business days. 2 Solar tunnels. . All of our 6 mil Greenhouse Poly comes pre-folded and rolled up on a hollow cardboard cylinder. Despite the sheltered position it has split a little in some areas and gone green because it's not cleaned often. Kumar Sivala. Three widths available, all with a length of 10m. £. I have used polytunnels since 1983 when I bought 3 of 18×55 feet (5. 98. Items 1 to 12 of 12. 92. However, It is not uncommon for polytunnel plastic to last longer, with some reaching around 9 years. Please contact us to order this product or get a quote. 99. Hoop Houses polytunnel uses a series of hoops to support the plastic covering. There are two ways to hold the plastic cover in place: pinning it to a wooden base rail which is fitted to the foundation tubes; or. Inhibits insect propagation. Small Polytunnels - also known as Mini Polytunnels or Small Space Polytunnels - are ideal if you're short of space or want to try your hand at gardening for the first time - they are perfectly sized to fit within a small garden. 5m) tall to let in plenty of light. Polytunnels are wonderful structures and good value compared to greenhouses. Polytunnels tend to flex more in the wind than greenhouses, which might explain why a relatively inflexible material like corrugated plastic develops cracks. Greenhouse grade polyethylene, a plastic film, is the most common material used for covering high tunnels. 65% on a sunny day and 81Wh and 0. Iwinna Polytunnel Greenhouse Clear Polythene Repair Tape (25m x 100mm) 233. Extending the traditional growing and marketing season should be a high priority for West Virginia produce growers. A polytunnel usually consists of a metallic, plastic, or wooden frame, covered with polythene or other similar materials. They are created from the sun’s heat, causing a rise in the temperature of the metal framing. 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. Alukap Fixing Buttons – White. I built 2 for around £30 in total. Staging Supports From £14. Description. Avoid construction grade material that has less strength. Add Mini Polytunnels, Row Covers or Cloches Inside Your Polytunnel Protecting plants growing in your polytunnel from frost is often simply a case of giving them an extra layer of protective covering. We offer 200micron High Diffusing UV Stabilized PE Greenhouse film. I’m in the northeast USA. unique. From the polytunnel frame and polytunnel parts to covers, clamps and internal additions - polytunnel accessories will help you to create the perfect growing space and to maintain it and repair it as needed over time. 1) Each arch built up with an 'L' shaped piece at the bottom of each leg. Outside Polytunnel Greenhouse with Heavy Duty Steel Frame, Large Walk in Greenhouse Tunnel Garden Plant Tomato Growhouse Hot House, 2m/3m/4m/5m/6m Long (Size 200x200x200cm) Patio, Lawn Garden. 2) The arches were temporarily sat in their final positions to mark ground areas were we needed to dig the holes for each leg. 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. PLEASE ENSURE YOU USE THE CALCULATOR PROVIDED. Was: £299. 99. Polytunnel plastic will last for at least 4-5 years. High tunnel with plastic covering. from China. 1 - 2 Day Delivery Top Quality 30-Day Returns . Our high tunnels help CSA’s and vegetable growers alike enjoy an extended season by getting their product to market sooner. Crinkill House, Birr, Co Offaly Eircode R42 VX36 Tel: 057 912 0424 Fax: 057 912 0944 Email: info@polydome. Add to basket. Agriculture farming tunnel hoop house. Or fastest delivery Tomorrow, 31 Oct. 4m x 0. 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. Robinson Polytunnels supply a range of polytunnel polythene for re-sheeting your polytunnel. Polytunnel plastic is rated to last for 5 years. This kit includes 6' Wiggle Wire bundles and 6'-6” bundles of Aluminum U-Channel Base sections with self-drilling center groove guides. It is very important to avail of a soil free from pathogens and pests. Width of. For the headboard, you will need 2×6×76 inches. UV treated, our 6 mil clear greenhouse plastic is rated for 4 years of life. Pull the polythene cover gently and carefully across the frame, making sure that the excess is distributed as evenly as possible around each side. Condensation issues in polytunnels can be resolved by installing Thermal Anti-Fog covers, which effectively reduce moisture. 1m & 14m Widths. Peppers and aubergines can also be grown up strings if you wish, there is a tradeoff between space requirement and extra work. The main types of poly tubes are high density polyethylene (HDPE) and. 100+ bought in past month. Arunabha Pal. Description. 12. co. 23m) Wide From £3,121. It helps if you measure the plot first to make sure it’s square. Product code. This frame is typically covered with polythene plastic that’s UV resistant so it lasts quite a while. £23. 4. Poly-Tex High Tunnel greenhouses are a quick and inexpensive way to lengthen your growing season, protect your crop from pests and disease, decrease water usage, and increase your crop yield. Steel Frame Poly Tunnel Steeple Greenhouse - Green. All of our 6 mil Greenhouse Poly comes pre-folded and rolled up on a hollow cardboard cylinder. If you need your cover ASAP, view our pre-cut and ready-to-ship 6 mil covers, which ship out in 1 to 3 business days if they are in-stock. Rough weight of this Greenhouse Plastic is . Buy Online – A wide range of polytunnel parts, spares & add-ons for polytunnels. A simple way to do this is to secure a rope close to the edge of the. uk. Hoops constructed of wire (9-gauge) or pipe (metal or plastic) can be. Aslo used as shade screen. 32m) Wide From £2,187. 99 £69. Horticultural Greenhouse Plastic Shade Cloth. com. The life of polyethylene film is limited due to degradation processes induced by sunlight and heat. 9 Best Crops To Grow In A Small Polytunnel. Step 6: Cover the frame with plastic sheeting. PLEASE ENSURE YOU USE THE CALCULATOR PROVIDED. High Tunnels are similar to hoop houses but are taller and are mostly used for commercial crop production. Woven 9 mil Plastic Covering. Our greenhouse allows +- 85% light transmission. Preparing Your Polytunnel Interior. Polytunnel covers are always a major aspect of any farmers or green fingered gardener’s horticultural range. Make sure it’s tightly drawn across the frame and then anchor it at the base of the structure. The main issue seems to have been stopping up the gaps properly. 17. Instead of a rope system, the structure is secured by metal base and hip board, side-braces, and purlins. 6m x 3m (19ft 8in x 9ft 10in) Premium Polytunnel Galvanised Frame by New Leaf™. Keep in mind, the longer the polytunnel, the more it will need to be braced for additional support. For a 3 foot wide tunnel you will need a meter of tubing. Polyane consists of a 3-layer transparent film which will last for many years. To successfully install your poly tunnel cover you will want to purchase four main components: Axiome 10mm Polycarbonate Sheets. Our tunnel house plastic roll-up door and ventilation windows with mosquito screens provide fresh air - regulating your tunnel house temperature and humidity to keep your plants growing well. Polytunnel plastic is typically made of polyethylene, a thermoplastic that can be melted down and reused. . 99 £69. It’s best to go for one that’s at least 6ft (1. Secures easily with Spring Lock Channel and Wire, and can last more than 4 years if installed correctly. A polytunnel usually consists of a metallic, plastic, or wooden frame, covered with polythene or other similar materials. 66. Patch holes and rips in Single OR Double Layer Greenhouse Plastic our FREE High Tunnel Hoop House Winter Maintenance Gu. From Einhell to Outsunny, you'll find a wide selection of greenhouses, polytunnels, balcony greenhouses and walk in greenhouses from our outdoor brands. £186. Unlike greenhouses that remain covered all of the time, high tunnel plastic coverings may be applied and removed seasonally, depending on the requirements of the crop. They continue to become more popular each gardening year. It is a very versatile form of tubing that has break and crack resistant walls. This can have many benefits for both edible and ornamental crops, such as enhancing the fragrance, taste, colour, earlier harvesting and longer post-harvest shelf life. 5 out of 5 stars 78. 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. Purchase high quality commercial and garden polytunnels online from Premier Polytunnels, direct from a UK manufacturer. A polytunnel can cost USD 50-4,000, depending on the size and materials you choose for construction. Stal Impex is a company specializing in the production of highly-processed steel products in the form of sections. From our polytunnels manufacturing facility in Navan County Meath, we produce a vast range of polytunnels and polycarbonate greenhouses in a selection of sizes from 6ft wide to more than 30ft wide and to any length you require. First, put the poles in the ground. • Our tunnels have very good head clearance right out to the sides giving ample. Domestic polytunnel. Sheeting a polytunnel correctly and making sure that the plastic is taut and as crease-free as possible will mean that the plastic will last far longer than it would do on an improperly installed polytunnel. Repair Tape - 50mm From £3. 50. First – What Exactly Is A Polytunnel? A polytunnel is best thought of as a frame for your garden. A quality tunnel house will also shield your plants from inclement weather, pests and predators. Solar tunnel offer a standard straight-sided burrow plan, however the spread is very . 9 out of 5 stars 177 £9. JFM Polytunnels. 5mm Wall Thickness Z35 High Tensile Galvanised Tube As used to manufacture all our Polytunnel kits. Greenhouse Garden Polytunnel Grow Tunnel Vegetable Allotment 0. You want 3. Adjust the plastic so it will create a tight seal on the roof and sides of your polytunnel. 95 £79. I was excited to erect this as I have neve. In this article, we will discuss the factors that impact the longevity of polytunnel plastic and how it can be recycled. 99 £ 9 . It is very important to avail of a soil free from pathogens and pests. View More. Also used to repair cracked panes in Glasshouses. 50+ bought in past month. If you can afford it, a poly tunnel with straight sides improves working conditions by providing more headroom and allowing more ventilation. And the bigger the planting area the more money you’ll save by opting for a polytunnel. com First – What Exactly Is A Polytunnel? A polytunnel is best thought of as a frame for your garden. Polytunnel. With a four-year warranty against UV degradation, Bootstrap Farmer's hoop house plastic film can also be cut to custom sizes. Our tunnel house plastic roll-up door and ventilation windows with mosquito screens provide fresh air - regulating your tunnel house temperature and humidity to keep your plants growing well. If cost is one of the main factors affecting your decision, polytunnels are far less expensive to install than greenhouses. Open: Monday to Friday 8am - 5pm Saturday 08:30am - 12noonPoly Tunnel Kit. Many of these items can also be used on polytunnels manufactured by other companies. Polytunnel & Canopy Covers. Crops Suitable for Polytunnels. The steel has a yield strength of 350N/mm 2 which is stronger than the standard 275N/mm 2. The use of Base Rails is a very popular option for covering a polytunnel.