Polycrub alternative
Comparison with traditional storm proof options
Storm proof greenhouse or polytunnel or Keder
Feature
Glazing
Wind Rating
Shatter Risk
Insulation (R-Value)
Insulation (U-Value)
Insulation (K-Value)
Light
Life Span
Keder Greenhouses
9 layer bubble laminate cladding with welded bead
Stands up to 120 mph in real-world scenarios (140 mph in tests)
None
High (1.7)
Low (0.5)
Extremely High (27.0)
Diffused No Scorch/Shadow
35 years at Worcestershire Keder site and counting (but this will be effected by location
Toughened Glass
4mm toughened safety glass
Rated for 90-137 mph with proper anchoring and bracing
Breaks into small, harmless pieces if shattered
Low (0.7)
High (1.4)
Low (2.3)
Clear (requires extra shading)
Varies by manufacturer some manufacturers quote upto 25 years
Standard Polytunnels
Single-layer polythene film
Prone to tearing/lifting in high winds
None, but can tear easily
Low (0.7)
High (1.4)
Low (3.1)
Can be variable
Frame 10 - 30 years dependent on materials used
Cover 6m to 10 years
dependent on materials and location
UK-based designer, manufacturer, and installer of high-performance robust greenhouses
If you are looking for a Polycrub alternative, Keder Greenhouse is the name you have been looking for.
Building ultra strong greenhouses for over 35 years, Keder Greenhouses are an excellent, proven option for storm resistance, known for withstanding winds up to 120 mph and even over 140 mph in real-world scenarios in exposed locations like the Scottish Islands. Their unique design sets them apart from traditional glass or polycarbonate greenhouses.
Keder Greenhouses for Extreme Weather
Keder Greenhouses offer a robust solution, different from aluminum-framed, glass-paneled options. They are specifically designed for exposed sites prone to high winds and heavy snow.
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Frame: They feature a ZN35 high-tensile, galvanised steel frame that provides significant stability.
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Glazing (Cladding): Instead of glass, Keder greenhouse use a unique 9-layer, ultra-strong bubble laminate cladding that creates an "air bubble sandwich".
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This material is tough and flexible, resisting lifting and flapping in strong gusts, and has no shatter risk from hail or flying debris.
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It is fixed securely to the frame using a Keder bead that is welded onto the side of the cladding and profile strip system, which is much more secure than clips and prevents wind from getting inside the structure.
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Wind Resistance: The combination of the high tensile steel frame and the ultimate secured cladding is proven to withstand winds of up to 120 mph, with some customer testimonials reporting survival in winds exceeding 140 mph during hurricanes where other structures failed.
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Insulation: The layered bubble cladding provides excellent insulation, with a high R-value of 1.7, which helps maintain stable internal temperatures and reduces heating costs in winter.