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Greenhouse Structures & Engineering

Poly Greenhouses (Multi-Span & Tunnel)

A poly greenhouse is a commercial protected-cropping structure covered in PE film or polycarbonate sheet, ranging from single-span tunnels to fully engineered multi-span structures with climate control, delivering mid-tech performance at 30–60% of Venlo CAPEX.

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Role in the project

Poly greenhouses are the workhorse of mid-tech commercial horticulture — profitable for berries, herbs, leafy greens and vine crops in warm and moderate climates.

Typical applications

  • Strawberry and blueberry commercial production
  • Mid-tech tomato, cucumber and pepper in warm climates
  • Herbs and leafy greens
  • Nursery propagation

Selection criteria

Film vs. sheet

Multi-year PE film (3–5 seasons) vs. twin-wall polycarbonate (10+ years) chosen on climate and hail exposure.

Span & gutter

8–12 m spans, 4–6 m gutter for commercial cropping.

Ventilation

Continuous roof vents essential above 25 °C ambient.

Engineering considerations

Wind loading

Poly structures are wind-sensitive — regional load class critical.

Foundation type

Concrete piers or driven ground screws by soil condition.

Commercial considerations

CAPEX band

USD 40–120/m² for engineered multi-span; USD 15–40/m² for tunnels.

Film replacement OPEX

Budget film change every 3–5 seasons.

Procurement considerations

Comparable scope

Compare like-for-like: span, gutter, film grade, vent ratio and screen package.

Common mistakes

  • Choosing tunnel scope for a year-round export crop
  • Undersizing roof vents in hot climates
  • No thermal screen where night radiation losses are significant

FAQ

Are poly greenhouses bankable?
Yes, when engineered to code and paired with credible off-take. Development banks routinely finance multi-span polycarbonate projects.

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