Should Pergolas Be Open or Closed in High Winds?
High winds can put real strain on a pergola, especially if it isn’t designed or used correctly. So, should pergolas be open or closed in strong winds? In most cases, keeping them open allows better airflow and reduces pressure on the structure. The exact answer depends on your pergola’s design, roof type, and how securely it’s fixed.
From design considerations to the proven durability of aluminium pergolas designed for UK weather, understanding how wind interacts with your structure is key to keeping your outdoor space safe.
Open or Close Your Pergola in High Winds? A Safety Guide
Picture this: your beautifully crafted pergola standing proud in your garden, the centrepiece of your outdoor space. Then, out of nowhere, the wind starts howling. Will your pergola hold its ground or turn into a casualty of the storm? The short answer to the question “Should pergolas be open or closed in high winds?” is: it depends on the design and conditions.
In general: open or partially open pergolas are safer in high winds, while solid or fully closed roofs increase wind pressure and risk unless they are specifically engineered and securely anchored.
Understanding the Forces of Wind on a Pergola
Wind Uplift
Wind doesn’t just push—it can also lift. When strong winds sweep over a pergola with a solid roof, they create upward pressure, known as wind uplift. Without secure anchoring, this force can lift roof panels or even dislodge the entire structure.
Wind Loading
Horizontal forces, called wind loading, can push against the pergola's frame, causing swaying or bending. The taller or more exposed your pergola, the greater the risk.
Importance of Secure Anchoring
Anchoring your pergola is non-negotiable. Whether it’s fixed into concrete footings or reinforced with heavy-duty brackets, proper pergola anchoring and installation dramatically reduces the risk of wind damage.
Pergolas with Different Roof Types in High Winds
Open Pergolas (No Roof or Open Lattice)
Minimal Wind Resistance
Open pergolas allow wind to pass through freely, reducing pressure on the structure. This makes them a sensible choice for exposed or windy locations.
Importance of Secure Posts
Even with minimal resistance, strong posts and secure fixings are essential to stop movement during gusty conditions.
Pergolas with Solid Roofs (e.g. Polycarbonate, Metal)
Increased Wind Uplift Risk
Solid roofs can behave like a sail in high winds, increasing the risk of uplift and structural strain.
Importance of Secure Fastenings and Strong Structure
Solid-roof pergolas must be built with robust frames and high-quality fixings to withstand wind forces safely.
Pergolas with Retractable Canopies or Awnings
Retract the Canopy in High Winds
Retractable canopies should always be closed when winds pick up to prevent damage to fabric and mechanisms.
Secure the Retracted Canopy
Once retracted, ensure the canopy is fully secured to avoid flapping and unnecessary wear.
Pergolas with Louvered Roofs
Open the Louvers (Partially or Fully)
Manual louvered pergolas are particularly effective in windy conditions, as opening the louvers allows air to pass through rather than pushing against a solid surface.
Avoid Fully Closing Louvers in Extreme Winds
In strong winds, fully closing louvers can increase pressure on the structure. Keeping them partially or fully open reduces uplift risk.
General Safety Precautions for Pergolas in High Winds
Regularly Inspect Your Pergola
Check fixings, posts, and roof components regularly for signs of wear or movement.
Trim Overhanging Branches
Loose branches can become dangerous projectiles in strong winds and should be kept well clear.
Secure Loose Objects Around the Pergola
Furniture, planters, and accessories should be secured or stored away during storms.
What to Do After a High Wind Event
Inspect for Damage
Once conditions are safe, inspect your pergola for loose fixings, damaged panels, or movement.
Contact a Professional if Necessary
If you’re unsure about the structural safety of your pergola, seek professional advice before using it again.
Conclusion
In high winds, pergolas are safest when designed to allow airflow and securely anchored. Open or louvered roofs generally perform better than solid surfaces, while regular maintenance and correct installation are essential for long-term stability.
By understanding how wind affects your pergola and using it correctly, you can protect your structure and enjoy your outdoor space with confidence.