If you've ever seen a greenhouse fly away in your garden after a storm (or worse, end up accordion-folded against your fence), you know exactly why this question is far from trivial. Choosing a greenhouse is good. Choosing a greenhouse that stands firm when the wind blows at 80, 100, or even 120 km/h is another matter. And that's precisely what we're going to talk about today, frankly and with concrete elements to help you make the right choice.
At AtmoSerre, we've been manufacturing and distributing polycarbonate greenhouses for years, and we've had time to observe what really works against the elements, and what doesn't. Here is our complete guide to the wind resistance of garden greenhouses.
🏗️ Why wind is the number one enemy of your greenhouse
We often think of snow, frost, extreme heat... but wind is undoubtedly the main cause of garden greenhouse destruction. And it's not just violent gusts during major storms: repeated winds, even moderate ones, fatigue structures, loosen fastenings, deform profiles, and ultimately weaken the entire construction.
The problem with wind on a greenhouse is that this structure is fundamentally a large surface that "catches" the air. Imagine a giant kite planted in your garden; that's kind of what the wind sees when it approaches your greenhouse. Every square meter of polycarbonate exerts pressure on the structure. And if this structure is not sized to absorb it, it bends, twists, or flies away.
The most vulnerable greenhouses are generally:
- Large-surface light plastic greenhouses, poorly anchored
- Greenhouses with overly thin profiles that deform easily
- Greenhouses installed without ground anchoring or with superficial anchors
- Greenhouses with walls that catch the wind head-on without an aerodynamic profile
🧱 Materials: not all are equal against the elements
The metal structure: the backbone of your greenhouse
A greenhouse's resistance begins with its load-bearing structure. What makes a greenhouse stand up to the wind is the quality of the profiles, their geometry, and how they are assembled together.
Entry-level greenhouses use very thin metal profiles (sometimes less than a millimeter thick) that will bend at the first major gust. Conversely, well-sized profiles with a carefully designed geometric shape (internal ribs, omega section, etc.) will absorb the lateral forces of the wind without flinching.
At AtmoSerre, the arches of L'Intemporelle are designed with 78 mm wide and 1 mm thick omega profiles, with a reinforced arch every other one for increased rigidity. This alternate reinforcement system is very effective: it distributes stresses over the entire frame instead of concentrating them at a few points. And unlike many competing greenhouses, these reinforcements are permanent, no need to disassemble anything in winter or strong winds.
Polycarbonate: glazing that resists where glass yields
In terms of glazing, polycarbonate is by far the best choice for areas exposed to wind. Unlike glass which shatters (and that's a disaster in terms of cost and danger), polycarbonate can absorb significant deformations without breaking. It is both flexible and impact-resistant.
L'Intemporelle is available in 4 mm (for mild to moderate climates) and 6 mm (for colder and more exposed regions). The 6 mm offers superior rigidity and significantly better thermal insulation; it's the choice we recommend as soon as you are in an area with regular winds or distinct winters.
Our panels are made of double-walled cellular polycarbonate, with a light transmission of approximately 85% and integrated anti-yellowing treatment as well as UV stabilizers on both sides. This is not a detail: polycarbonate that yellows and becomes brittle gradually loses its mechanical resistance. The durability of the material also guarantees that your greenhouse will be as strong in ten years as it was on day one.
⚓ Anchoring: the most underestimated point of all
You can have the best greenhouse in the world (the strongest profiles, the thickest polycarbonate), but if it is not properly anchored to the ground, it will fly away. It's that simple.
Anchoring is truly the weak link in most installations on the market. And yet, it is often the part that people neglect the most, either out of impatience during assembly or because they opted for a model with overly superficial anchors.
On L'Intemporelle, each arch is anchored in the ground for approximately 35 cm, which is significantly deeper than the majority of kit greenhouses available on the market. And the base of the greenhouse is raised by a 10 cm high metal base, which prevents the polycarbonate from coming into contact with damp soil while creating a stable support for the frame.
The whole is assembled with M5 bolts, which ensure a rigid and durable connection between the elements. No clips that loosen with vibrations, no elastic system that gives way under pressure. Bolts. Simple, reliable, proven.
Some additional tips to optimize your anchoring
If you are in a particularly windy area, here are some additional tips that can make a difference:
Check the nature of your soil. Clay soil moves with humidity variations, it swells in winter, retracts in summer. These movements can gradually destabilize even a well-executed anchoring. In this case, push the arches deeper if possible and check the fastenings every autumn.
Do not place the greenhouse on overly loose soil. Freshly turned earth or very light sandy soil holds the arches less well. Compact the soil well before installation, or choose a location on a stabilized area.
Use the location to your advantage. Positioning the greenhouse so that the prevailing wind hits the gable (the side with the door) rather than the length of the structure improves overall resistance.
🌬️ The tunnel shape: a real aerodynamic advantage
This is a point that is not emphasized enough, and yet it is fundamental: the shape of your greenhouse directly determines how the wind will interact with it.
A greenhouse with a flat roof or a straight gable presents a large frontal surface that receives the wind head-on. The wind creates very significant pressure and depression zones, and the structure must absorb considerable forces.
A tunnel-shaped greenhouse, like L'Intemporelle, benefits from naturally favorable aerodynamics. The curvature of the arch makes the wind "slide" over the surface rather than stop it. Pressure forces are better distributed over the entire frame, and stress peaks are significantly lower than those of a right-angled structure.
This is one of the reasons why L'Intemporelle resists winds of up to 180 km/h, a threshold that largely covers the most violent storms you can encounter in mainland France, including coastal or mountainous areas. As a reminder, Hurricane Xynthia in 2010 reached gusts of 160 km/h on the Atlantic coast. L'Intemporelle would have held up!
📐 Technical specifications to check before buying
When comparing greenhouses, here are the technical elements you should focus on, not just the price or the area.
✅ Stated wind resistance (in km/h)
This is the most telling figure. But beware: some manufacturers announce resistance without specifying the testing conditions. Look for concrete and verifiable figures. For L'Intemporelle, the 180 km/h resistance is real technical data, not a vague marketing argument.
✅ Snow resistance
Often correlated with wind resistance, snow load resistance is a good indicator of a structure's overall robustness. L'Intemporelle resists 90 cm of snow, or about 150 kg/m², which is well above the needs of the vast majority of gardens in France, even in mountainous areas.
✅ Profile thickness and geometry
A wide and thick omega profile will always be more rigid than a small-section hollow profile. Ask for precise dimensions: profile width, wall thickness. These are data that serious manufacturers communicate without hesitation.
✅ Assembly type
Greenhouses assembled with bolts are systematically stronger than those with clips. Clips can loosen with repeated wind vibrations and thermal expansion. M5 bolts, however, hold over time.
✅ Arch anchoring depth
The deeper the arches are driven in, the more stable the greenhouse. A 20 cm anchoring does not offer the same hold as a 35 cm anchoring. This is simple but decisive data.
✅ Polycarbonate fastening system
The panels must be rigidly held along their entire length. On L'Intemporelle, retention is ensured by M5 bolts and Ø40 mm plastic tabs, which ensures that the panels cannot lift under the effect of wind.
🏡 Which greenhouse to choose specifically for a windy area?
That's the practical question. We'll be direct.
If you live in a coastal area, in the mountains, or in a wind corridor (Rhône Valley, Alsace plain, Brittany, Normandy, etc.), you need a greenhouse with:
- Robust and well-sized profiles (omega profiles, alternating reinforcements)
- 6 mm double-walled polycarbonate for cold and exposed areas
- Deep anchoring (minimum 35 cm) on stable ground
- Bolted assembly (no clips)
- An aerodynamic shape that does not catch the wind head-on
For moderately exposed areas (the vast majority of gardens), 4 mm polycarbonate with the same level of structure and anchoring will be perfectly adequate.
We invite you to discover our complete selection on our dedicated garden greenhouse page, where each model is accompanied by its detailed technical specifications.
A model that consistently comes up in our customers' choices for exposed areas is L'Intemporelle, a tunnel greenhouse designed to last, with wind resistance of 180 km/h and 90 cm of snow, reinforced omega profiles, and deep anchoring for each arch. The name was not chosen by chance: it is precisely the kind of structure that endures for decades without faltering.
🛠️ Good practices after installation
Having a good, well-anchored greenhouse is already a huge step. But maintenance and vigilance after installation are also part of the game.
Check the fastenings every autumn. The bolts work slightly with thermal cycles; arches can shift in moving soils. A small annual inspection (30 minutes maximum) can prevent major damage.
Inspect the rubber seals that protect the polycarbonate channels. These seals prevent dust and debris from accumulating in the cells, which preserves both thermal insulation and the integrity of the panels in the long term.
Resist the temptation to overload the structure. Sometimes we see greenhouses with tarpaulins, shade cloths, or irrigation systems hung all over the frame. Each added element changes the wind resistance. Be reasonable.
Position windbreak plants if possible. A hedge of privet, laurels, or even bamboo a few meters from the greenhouse can significantly reduce wind speed at the structure level. It's not a miracle solution, but combined with a good, well-anchored greenhouse, it makes a real difference in the long term. 🌿
Do not leave doors and windows open in strong winds. This is a simple reflex that is often forgotten: a greenhouse with an open door flapping in the wind is a greenhouse working against its aerodynamic design. Close everything hermetically when the weather deteriorates.
📊 Summary table: which type of greenhouse for which exposure?
| Exposure Level | Recommended Polycarbonate Thickness | Points of Vigilance |
|---|---|---|
| Protected area (city garden, surrounded by hedges) | 4 mm | Standard anchoring, annual check |
| Moderately exposed area | 4 mm to 6 mm | Careful anchoring, stable ground recommended |
| Highly exposed area (coast, mountains, wind corridor) | 6 mm | Deep anchoring, compacted soil, vegetated windbreak advised |
| Extreme area (regular storms > 100 km/h) | 6 mm | Optimized orientation, maximum anchoring, regular inspection |
🌿 Polycarbonate maintenance in windy areas
In exposed areas, polycarbonate is subject to repeated mechanical stresses (slight bending, vibrations) which can eventually affect the sealing joints and support profiles. Here's how to keep your greenhouse in perfect condition:
Clean the junction profiles at least once a year. Dust, moss, and plant debris accumulate in the assemblies and can slightly force the panels, creating tension points.
Monitor the discoloration of the polycarbonate. Strongly yellowing polycarbonate indicates insufficient UV protection originally, or a very old greenhouse. On our models, the panels are equipped with an anti-yellowing treatment and integrated UV stabilizers, which guarantees durability and mechanical resistance over time, even under intense sunlight.
Check the panel retaining tabs after each heavy winter. These small parts play a key role in holding the panels under wind pressure; a damaged tab can be easily replaced, preventing a panel from coming off during the next storm.
❓ FAQ — The questions we are asked most often
Can a greenhouse really withstand gusts of 100, 120, or even 150 km/h? Yes, provided it is properly sized and anchored. L'Intemporelle is designed to withstand winds of up to 180 km/h, which largely covers the most violent storms recorded in France. What gives way first in the vast majority of cases is the anchoring, not the structure itself.
Is a small, sturdy greenhouse better than a larger, cheaper one? A small, well-built and well-anchored greenhouse will always be preferable to a large, poorly secured low-cost greenhouse. The wind load is directly proportional to the forces the structure must withstand; a large, cheap greenhouse in an exposed area is a risk. That said, L'Intemporelle is available from 6 m² to 36 m², and the structure remains identical regardless of size: you choose your surface area without ever sacrificing robustness.
Are tunnel greenhouses more resistant than chapel greenhouses? For wind resistance, yes. The rounded shape of the tunnel arch allows the wind to glide over it rather than block it head-on, which significantly reduces the forces exerted on the structure. This is one reason why L'Intemporelle can boast 180 km/h resistance; its shape contributes as much as its materials.
My soil is clayey; does that pose a problem for anchoring? Clay is a soil that "works" a lot with humidity variations; it swells in winter and retracts in summer. These movements can gradually destabilize superficial anchoring. In this case, we recommend thoroughly compacting the soil around the arches after installation and checking the fastenings every autumn before the winter season.
Can L'Intemporelle be extended if more space is desired? Absolutely! This is one of the great advantages of this model: the greenhouse is modular and extensible beyond 30 meters thanks to cumulative 2 m extensions. You start with a 6 m² or 12 m², and you expand it whenever you want, without having to buy an entire new greenhouse.
In case of an announced storm, what should I do? As a precaution, hermetically close doors and roof windows. Remove anything that could fly away around the greenhouse (stakes, pots, tools). Quickly check the bolts of the most exposed arches. And if the greenhouse contains sensitive plants, be ready to intervene quickly after the storm to assess the condition of the crops. For more advice on preparing your greenhouse for bad weather, consult our article Don't let winter stop your vegetable garden
💡 Conclusion: wind resistance is prepared before purchase
As we often say at AtmoSerre: the best protection against wind is an informed choice from the outset. A greenhouse designed to last, with quality materials, a solid bolted assembly system, and deep anchoring adapted to your terrain, is an investment that will save you many disappointments and replacement costs.
Wind is not an inevitability. A well-designed, well-positioned, well-anchored structure can withstand years of strong winds without flinching. Our customers in the coastal areas of Brittany, in the Alps, or in the Rhône Valley are living proof of this. With L'Intemporelle and its 180 km/h wind resistance, you can be sure to cultivate peacefully, even when the weather doesn't cooperate. 🌱
Before buying, take the time to analyze your wind exposure, consult local weather data, and do not hesitate to contact us; we are here to help you choose the right model and the right polycarbonate thickness for your specific situation.
Discover our complete range on AtmoSerre and find the greenhouse that will withstand all winds, for all seasons.