5.5mm x 19mm Hex Head Metal Self Drill Screws. These screws drill their own hole and then tap into steel. They are quick and save hours pre-drilling 

Steel Specification

25.4mm x 1.2mm Wall Diameter - Z35 High Tensile Galvanised
35.0mm x 1.5mm Wall Diameter - Z35 High Tensile Galvanised
50.8mm x 1.5mm Wall Diameter - Z35 High Tensile Galvanised
60.3mm x 1.5mm Wall Diameter - Z35 High Tensile Galvanised

The length of swage for each tube are as follows:

• 25.4mm-51mm
• 35.0mm-70mm
• 50.8mm-83mm
• 60.3mm-90mm

The OD of a swaged tube are as follows:

• 25.4mm-22.0mm
• 35.0mm-31.0mm
• 50.8mm-46.8mm
• 60.3mm-56.3mm
• Should you require a different length, or with a flattened end or ends?
• A 'Flattened' joint creates a nominal loss in the length of 5mm - Example a tube 100cm long (1000mm) with 'Flattened Ends' at each end will result in a final length of 99cm (990mm). Flattened End for 60.3mm is not available.
• Please email us at info@highlandpolytunnels.co.uk  

• The aluminium rail joiner is required for connecting both single and double aluminium extrusions, meaning it’s a universal connector across the whole rail system — not all suppliers design theirs this way.

• It’s supplied as a pack of two, each with 3mm grub screws, which tells you the rails rely on a proper mechanical clamping system rather than simple push‑fit or overlap joints. This gives a stronger, cleaner finish.

🔧 Aluminium & Timber Base and Side Rail Fittings

Strong, universal fittings for securing polytunnel covers

We supply aluminium or timber base and side rail fittings designed for garden and commercial polytunnels. Available in 25mm, 35mm, 50.8mm, and 60.3mm, these fittings provide a reliable method of fixing the polythene cover to the frame — eliminating the need to dig trenches.

By locking the foundation tubes together as one continuous structure, base rails significantly increase the strength and stability of the polytunnel. They also make future maintenance easier, allowing the cover to be replaced quickly when refurbishment is needed.

These fittings are compatible with most polytunnel brands, offering a simple, effective upgrade regardless of the manufacturer.

We offer a wide range of brackets, clamps, and fittings suitable for both garden and commercial polytunnels, regardless of the manufacturer. Our available sizes include 25mm, 35mm, 50.8mm, and 60.3mm. All fittings are galvanised or zinc plated to ensure a longer lifespan. If you have any doubts or questions, please don't hesitate to contact us.

https://highlandpolytunnels.co.uk/replacement-tube-design-15095-p.asp

We offer a wide range of brackets, clamps, and fittings suitable for both garden and commercial polytunnels, regardless of the manufacturer. Our available sizes include 25mm, 35mm, 50.8mm, and 60.3mm. All fittings are galvanised or zinc plated to ensure a longer lifespan. If you have any doubts or questions, please don't hesitate to contact us.

Our Foundation Tubes are designed specifically for use with our range of Polytunnels, featuring a swaged end for secure assembly. These tubes are suitable for quick and straightforward installation, particularly when constructing Polytunnels onto a soil base.

Installation Options

Foundation Tubes may be anchored directly into concrete for enhanced stability, or alternatively, they can be used in conjunction with Anchor Plates. Both methods provide reliable support for the structure, depending on site requirements and user preference.

Available Sizes

We offer Foundation Tubes in four different sizes to accommodate various specifications. Please refer to the table below for detailed information regarding each tube size.

The OD of the swaged end is as follows:

• 25.4mm with a .22mm swaged end.
• 35.0mm with a 31mm swaged end.
• 50.8mm with a 46.8mm swaged end.
• 60.3mm with a 56.3mm swaged end.

We provide various options for ground foundations or anchor plates, as well as base plates for concrete or timber, for both garden and commercial polytunnels. These options come in sizes of 25mm, 35mm, 50.8mm, and 60.3mm. For smaller tunnels, we also offer screw anchors in sizes of 25mm and 35mm. These options are compatible with most polytunnels, regardless of the manufacturer.

PLEASE NOTE: IF YOU ARE ORDERING THE ANCHOR PLATES, YOU MAY REQUIRE THE FOUNDATION TUBES TOO.

🔧 Material & Design Insights

• The PVC infill is designed to work with both single and double aluminium extrusions, meaning the manufacturer uses a unified rail profile system — great for repairs or upgrades without compatibility headaches.

• The top and bottom profiles are intentionally “kinder” to polythene or net, reducing abrasion and extending cover life. This is a subtle but important design choice for long-term durability.

🔥 Anti‑Hot Spot Tape

Anti‑hot spot tape is applied directly to the metal frame of your polytunnel to prevent heat transfer from hot steel into the polythene cover.

• Prevents “hot spots” that weaken and damage polythene

• Reduces friction when fitting or tightening the cover

• Extends cover lifespan by at least one year

• Considered an essential accessory for any polytunnel

We offer a wide range of brackets, clamps, and fittings suitable for both garden and commercial polytunnels, regardless of the manufacturer. Our available sizes include 25mm, 35mm, 50.8mm, and 60.3mm. All fittings are galvanised or zinc plated to ensure a longer lifespan. If you have any doubts or questions, please don't hesitate to contact us.

Click the links below for other parts.

Intermediate base and side rail fittings .

Ridge bars fittings.

Door frame brackets.

Q Clips

Anchor Plates provide a strong, reliable alternative to concreting and add extra security to your polytunnel structure. They are essential when fitting Base Rails or Side Rails, helping to prevent the framework from lifting or sinking over time.

Each square plate slides over the Foundation Tube (not included) and is secured at the base using two clamps—one above and one below the plate. Once buried, the plate locks the tube firmly in place, improving overall stability in a wide range of soil conditions.

Available in three sizes. Please refer to the table below for pack contents.

Single Aluminium Extrusion (Base rail), available in a variety of lengths. We use this single profile on base rails for Polytunnels. Designed to accept 200 micron polythene and used in conjunction with our PVC infill and Rail Joiners.

Attached to the framework with intermediate and corner clamps.

Base Plates provide a quick, reliable method of installing a Polytunnel onto a timber or concrete base. They create sturdy ‘feet’ for the framework and are used instead of Foundation Tubes when ground‑dig installation isn’t suitable.

Each plate is manufactured to securely support the hoop and ensure a stable, long‑lasting structure.

Fixing Options

• Timber Base: Supplied with M8 × 50 mm screw bolts for fast, secure fixing.

• Concrete Base: Supplied with M10 × 75 mm Rawl bolts for heavy‑duty anchoring.

Hoop Compatibility

• 25.4 mm diameter hoops locate inside the Base Plate tube.

• 35 mm diameter hoops locate outside the Base Plate tube.

This ensures a snug, secure fit regardless of hoop size.

Please Note, Hoops with a diameter of 25.4mm will locate inside the Base Plate Tube. Hoops with a diameter of 35mm will locate outside of the Base Plate Tube.

🌿 Polytunnel & Greenhouse Repair Tape

Ideal for any polytunnel or greenhouse, this UV‑stabilised repair tape is designed to fix small tears, splits, and punctures in your polythene cover. It is fully transparent, allowing maximum sunlight through without reducing clarity, and is engineered to outlast the lifespan of most covers.

• UV stabilised for long‑term outdoor durability

• Clear finish that won’t block or diffuse light

• Strong adhesive for reliable, weather‑resistant repairs

• Suitable for polytunnel polythene and glass greenhouse panels

            A simple, cost‑effective way to extend the life of your growing structure.

Crop Bars are galvanised steel bars fixed across the hoops above head height to suspend wires, canes, netting, or hanging baskets. They also stiffen the tunnel structure, giving extra protection in exposed, windy sites.

How to Order

Choose three things:

• Polytunnel Width — select the internal width of your tunnel so the bar length matches.

• Q Clip size — pick the clip that matches your hoop diameter.

• Quantity — enter the number of individual Crop Bars you need.

• See below.

• The double aluminium extrusion is specifically designed for base rails, meaning it’s the heavy‑duty option in the rail system — ideal for areas where cover tension and structural strength matter most.

• It’s engineered to accept 200‑micron polythene, the industry‑standard thickness for long‑life polytunnel covers. This confirms the extrusion is built for proper grip and durability.

• The system relies on PVC infills and rail joiners, creating a professional clamping method that avoids rot, warping, and uneven tension.

Double Aluminium Extrusion, available in a variety of lengths. We use this double profile on base rails for Polytunnels. Designed to accept 200 micron polythene and used in conjunction with our PVC infill and Rail Joiners.  Attached to the framework with intermediate and corner clamps.

Please note, you will require the fixings mentioned. Click on the links above.

We offer a wide range of brackets, clamps, and fittings suitable for both garden and commercial polytunnels, regardless of the manufacturer. Our available sizes include 25mm, 35mm, 50.8mm, and 60.3mm. All fittings are galvanised or zinc plated to ensure a longer lifespan. If you have any doubts or questions, please don't hesitate to contact us.

https://highlandpolytunnels.co.uk/replacement-tube-design-15095-p.asp

🌿 AlgiclearPro Green Algae Remover – Super Concentrate

Long‑term control for algae, moss, liverwort & lichens

AlgiclearPro is a highly concentrated, environmentally sensitive treatment designed to kill and prevent algae, moss, liverwort and lichens on all hard surfaces. Using patented technology, Algiclear lifts and encapsulates the algal cell, causing it to dry out and simply blow away.

This twin‑effect formula provides immediate cleaning and residual protection for up to 9 months, helping keep surfaces clear long after application.

Base Plates provide a quick, reliable method of installing a Polytunnel onto a timber or concrete base. They create sturdy ‘feet’ for the framework and are used instead of Foundation Tubes when ground‑dig installation isn’t suitable.

Each plate is manufactured to securely support the hoop and ensure a stable, long‑lasting structure.

Fixing Options

• Timber Base: Supplied with M10 × 50 mm screw bolts for fast, secure fixing.

• Concrete Base: Supplied with M10 × 75 mm Rawl bolts for heavy‑duty anchoring.

Powerful protection with a safer, grower‑friendly formula

Hortisept Pro is a specially formulated synergistic disinfectant blend that delivers broad‑spectrum protection while remaining user‑safe and environmentally sensitive. Effective against bacteria, fungi, and viruses, it provides reliable hygiene for polytunnels, greenhouses, propagation areas, and equipment.

Why Growers Choose Hortisept Pro

• Bactericidal, fungicidal & virucidal performance

• Non‑corrosive and low‑risk for users and the environment

🌿 Polytex Pro – Polytunnel & PVC Cleaning Solution

Green residue on your polytunnel cover can significantly reduce light transmission, limiting plant growth and reducing overall efficiency. This build‑up often comes from nearby trees and general environmental exposure. Importantly, soapy water should never be used, as it reacts negatively with the oil‑based polymers in polytunnel plastic.

Polytex Pro is the only cleaner we recommend. It has been specifically developed for the safe and effective cleaning of polythene, plastics, and uPVC — making it ideal for polytunnels, conservatories, and window frames. 

🧴 Application Rates

• Dilution: Mix 1:10 with water

• Suitable for manual cleaning, machine application, or power hose use

• For best results, apply and then rub with a soft broom or cloth shortly afterwards

📏 Coverage

• 1 litre covers approx. 110m² (e.g., a 14ft × 45ft polytunnel)

• 5 litres covers approx. 550m² (e.g., two 21ft × 80ft polytunnels)

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece. 

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece. 

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece. 

Our Aluminium sliding door track is manufactured from a heavy duty Alloy 6063 T6, as this is used for sliding doors on our Domestic and Commercial Polytunnel range. Sliding door track available in three lengths for attaching a single, wide and double sliding doors. Corner protectors are available to help protect the sharp corners. Please see table below for weight.

🌿 How It Works

Once applied, water condenses into a thin, continuous film rather than forming droplets. This film then runs down the curved sheeting to the outer edges of the structure, keeping the interior clear and drip‑free.

🏡 Suitable for Multiple Greenhouse Plastics

Sunclear can be used on:

• UVI polythene

• PVC

• Polyester sheeting

• Flexible or rigid plastics used in greenhouse construction

Although developed for polytunnels, it performs equally well in glasshouses and other covered growing environments.

⭐ Key Benefits

• Up to 15% more light transmitted

• Non‑toxic and safe for use around plants and food crops

• Easy application — spray or paint on

• Eliminates dripping, helping reduce fungal diseases such as Botrytis

📏 Coverage

One 473ml container covers up to 900m² (9,500ft²) — approximately a 21ft × 100ft polytunnel.

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece. 

75cm Staging Support - Used for our 8ft - 14ft Wide Polytunnel Models
A. Staging Width - 75cm (30in)
B. Height - 75cm (30in)
C. Manufactured from 25.4mm Steel

PRICES ARE FOR ONE SIDE OF THE POLYTUNNEL, SHOULD YOU REQUIRE IT ON BOTH SIDES PLEASE CLICK THE + BESIDE THE ADD TO CART BUTTON

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece. 

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece. 

Our 6ft wide hoop is produced from 25mm galvanised steel tube as used in our 8ft wide polytunnel model. We offer a full hoop in four piece sections. We also offer individual sections.

Hoops simply slot together, allowing easy storage when not in use. A permanent fix can be achieved through using Self Drill Screws. The hoops can be pushed into soft soil, or you can look at ordering additional Foundations for a more permanent and secure fitting.

A. Hoop Width - 6ft (1.83m)
B. Height - 6ft 10in (2.08m)
C. Straight Side - 4ft (1.21m)
D. Distance Over Hoop - 17ft 3in (5.25m)

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece. 

This UV-protected ground cover and staples offer ample coverage for the entire base of a polytunnel. Supplied with metal ground staples to secure your sheet in place (approximately 5ft apart). Its unique ripple weave technology ensures excellent water dispersion, making it easy to clean - just use a hose. It also features grid lines for simple pot placement. Five-year UV guarantee, 100gsm thickness.

Please Note - The widest Ground Cover width available is 5m (16¼ft), if your Polytunnel Width exceeds this size, the Ground cover will be supplied in more than one piece.