Tunnel type greenhouse

Overview
Twin-skinned insulated polytunnels use an inflated double-layer polythene cover to reduce heat loss and stabilise internal climate for crop production. These systems are available as complete installations or as retrofit upgrades to existing polytunnels.

Key details

• Heat loss reduction: twin-skinned polythene typically reduces heat loss by 30–40% compared with single-skinned polythene.
• Cover: clear polythene covers are recommended to maximise daylight; diffused covers may reduce light transmission when doubled.
• Inflation system: an inflation fan maintains air between the layers; fans are pressure-operated to top up automatically if leakage occurs.
• Snow management: fan pressure can be relaxed so the sheets touch, allowing heat transfer to assist snow melt.
• Linked covers: multiple covers can be connected so one fan supports several inflated covers (up to ~1,000 m² per fan using linking kits).
• Supply options: available as full packages or retrofit kits to upgrade existing tunnels.

What to expect from us

• Consultation to define structure, cover type and internal systems for crop and site requirements.
• Bespoke design: 2D/3D modelling, structural analysis and project engineering support.
• Manufacture of structural components and cover materials with quality control.
• On-site construction and experienced project management for efficient installation.
• Logistics: dedicated dispatch and delivery coordination tailored to project schedules.
• Aftercare: maintenance options and technical support for inflation systems and covers.

Technical specifications

• Typical heat loss reduction: 30%–40% vs single-skinned polythene.
• Cover material: twin-skinned polythene (clear recommended to maximise daylight).
• Inflation: pressure-sensing inflation fan for automatic topping up; linking kits available for multi-cover systems.
• Snow handling: adjustable fan pressure to allow sheet contact and melt by heat transfer.
• Coverage per fan: up to approximately 1,000 m² when covers are linked (dependent on site conditions).
• Delivery modes: complete installation package or retrofit upgrade to existing polytunnels.