Preparing Your Greenhouse for a Storm and High Winds

A greenhouse is a gardener’s sanctuary, a haven for nurturing plants year-round. However, when storms and high winds strike, this cherished space can be vulnerable. Glass greenhouses, though elegant and effective, require extra care to withstand the forces of nature. In this guide, we’ll explore how to go about preparing your greenhouse for a storm, high winds or severe weather, ensuring both its integrity and the safety of your plants.

This blog covers greenhouses not manufactured by Access – if you have an Access mini greenhouse or Cold Frame, read this blog instead.

Assessing Your Greenhouse Structure

Before diving into preparations, it’s essential to evaluate your greenhouse’s current condition. Pay close attention to the following:

1. Frame Integrity
   • Inspect the frame for signs of rust, corrosion, or cracks, especially in older structures. Aluminium and steel frames are sturdy but may weaken over time.
   • Tighten any loose bolts or screws to reinforce connections.
2. Glass Panels
   • Check each pane for cracks, chips, or loose fittings. Damaged glass is more likely to shatter under pressure.
   • Clean the glass thoroughly to identify any imperfections that might have gone unnoticed.
3. Foundation Stability
   • Examine the foundation for signs of erosion or shifting. A solid, level foundation anchors your greenhouse and reduces the risk of tipping during high winds.

Strengthening the Greenhouse for a Storm

To fortify your greenhouse against storms, follow these steps:

1. Reinforce Glass Panels
   • Use silicone sealant or weatherproof adhesive to secure glass panes firmly within their frames. This prevents them from rattling or dislodging during strong gusts.
   • Consider installing safety film over the glass. This transparent film holds shattered glass in place, reducing hazards.
2. Install Bracing
   • Add diagonal braces or tension wires across the corners of the frame. These increase rigidity and help distribute wind forces evenly.
   • For larger greenhouses, internal bracing poles can provide additional support.
3. Anchor the Structure
   • Use ground anchors or stakes to secure the greenhouse to its foundation. For concrete bases, expansion bolts are ideal.
   • If your greenhouse is on soil, spiral anchors or weighted base plates can enhance stability.
4. Seal Gaps and Cracks
   • Inspect the entire structure for gaps where wind could enter and create internal pressure. Use caulk or weather stripping to seal these areas.

Protecting Plants Inside the Greenhouse

While safeguarding the structure, don’t forget the plants. High winds and storms can create temperature fluctuations and debris hazards within the greenhouse. Here’s how to protect your greenery:

1. Move Vulnerable Plants
   • Relocate delicate or tall plants to the centre of the greenhouse, away from glass walls.
   • Use sturdy shelves or benches to elevate plants off the ground and shield them from potential water pooling.
2. Secure Loose Items
   • Remove or tie down any loose pots, tools, that could become projectiles during high winds.
   • Store lightweight items in closed cabinets or bins.
3. Maintain Air Circulation
   • Ensure that vents and fans are in good working order. Proper airflow minimizes humidity and reduces the risk of fungal infections during stormy weather.
4. Add Insulation
   • Use bubble wrap or horticultural fleece to insulate plants from temperature drops. These materials also provide a cushioning layer against flying debris.

Weatherproofing Essentials

Certain tools and materials can be lifesavers when preparing your greenhouse for a storm. Stock up on these essentials:

• Heavy-Duty Tarps
  • In case of broken glass, tarps can temporarily cover exposed areas.
• Duct Tape
  • Use duct tape to quickly patch minor cracks or reinforce seals.
• Sandbags
  • Place sandbags along the greenhouse’s perimeter to weigh down the structure and improve stability.
• Backup Power Supply
  • If your greenhouse relies on heating or ventilation systems, invest in a generator or battery backup to maintain functionality during power outages.

Preparing for the Storm

When a storm is imminent, preparing your greenhouse for a storm involves these final precautions:

1. Double-Check Locks and Fastenings
   • Secure all doors, vents, and windows. Use additional locks or clips if necessary to prevent them from being forced open by wind.
2. Prune Surrounding Vegetation
   • Trim overhanging branches or remove nearby dead trees that could fall onto the greenhouse during the storm.
3. Remove External Hazards
   • Clear the area around the greenhouse of any debris or objects that could be picked up by the wind.
4. Monitor Weather Updates
   • Stay informed about the storm’s progress. If evacuation becomes necessary, prioritize safety and return to assess the greenhouse once conditions improve.

Post-Storm Recovery

Once the storm has passed, follow these steps to assess and repair any damage:

1. Inspect for Damage
   • Carefully examine the greenhouse for broken glass, structural issues, or water leaks. Document damages for insurance purposes if applicable.
2. Clean and Disinfect
   • Remove debris and disinfect surfaces to prevent mould or pests from taking hold.
3. Repair or Replace Components
   • Replace shattered glass panes and damaged seals promptly. Consider upgrading to tempered or polycarbonate panels for added durability in the future.
4. Reassess Anchoring and Bracing
   • Tighten or replace any loose anchors or braces to prepare for future storms.

Long-Term Strategies for Resilience

To minimize future risks, consider these upgrades:

1. Switch to Toughened Glass or Polycarbonate Panels
   • Polycarbonate is lighter and more flexible than glass, making it less prone to shattering in high winds. However, as it flexes, it is more likely to come out of the frame in high winds unless it has been sealed in.
   • If the structure is strong enough, upgrade to 3mm or 4mm toughened safety glass. 3mm toughened glass is about 7 times stringer than horticultural glass – Access are able to supply sheets of 2ft x 2ft (610mm x 610mm) toughened safety glass that will fit standard greenhouses.
2. Invest in a Windbreak
   • Plant hedges or install fences around your greenhouse to reduce wind exposure.
3. Upgrade the Frame
   • Opt for a sturdier frame made of galvanized steel or reinforced aluminium if your current structure is aging.
4. Adopt Smart Monitoring Systems
   • Install sensors to track temperature, humidity, and wind speed inside the greenhouse. These systems can alert you to potential issues in real time.

Conclusion

Preparing your glass greenhouse for a storm and high winds is a combination of proactive maintenance, strategic upgrades, and careful planning. By reinforcing the structure, securing the interior, and staying vigilant, you can protect your investment and ensure that your plants thrive, even in adverse conditions. With these measures in place, your greenhouse will remain a resilient oasis, ready to weather any storm.