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Greenhouse Wind and Snow Loads

Our Strength Starts with our Framing

Engineering for 140 mph Winds and Over 100 PSF Snow Loads

When you invest in a quality made-to-order greenhouse, you are investing in long-term performance. The strength of your greenhouse determines how it handles wind, snow, temperature swings, and decades of use.

At BC Greenhouse Builders, our standard greenhouses are engineered for 85 mph winds and 32 pounds per square foot of snow. We can upgrade our structures to withstand 140 mph winds, equivalent to Hurricane Force Level 1, and over 100 pounds per square foot of snow load to meet local building codes and weather conditions

Designed Around Your Local Climate

Every greenhouse is engineered to meet the structural design loads specified for your municipality. We regularly engineer upgrades for:

  • Hurricane-prone coastal regions
  • High snow load mountain zones
  • Rooftop and elevated installations
  • Seismic regions
  • Commercial and institutional building code requirements

Stamped engineering drawings are available throughout North America. Your greenhouse is not built to a generic national average. It is engineered for the specific weather conditions in your neighborhood.

heavy snow greenhouse

What Makes a Greenhouse Strong?

We build strength into both the frame and how it interacts with glazing and site conditions.

Our frames are made from high-grade aluminum (6063 T5/T6), chosen for long-term stability in outdoor conditions. Proprietary extrusion (framing) profiles, developed through decades of design improvements since the 1950s, provide the backbone of the greenhouse and distribute loads throughout the frame rather than concentrating stress at isolated points.

Our glazing bars and structural load-bearing components, including trusses and purlins, are engineered for load-bearing performance, weather and water tightness, seasonal expansion and contraction, and long-term durability. Each aluminum profile incorporates internal and external weep systems that channel moisture to the exterior of the greenhouse, protecting both the structure and glazing.

Although more costly upfront, heavy duty aluminum greenhouses offer important advantages in extreme climates:

  • No rust, rot, or decay
  • Stability through temperature expansion and contraction
  • High strength-to-weight ratio
  • Long-term structural reliability in humid greenhouse environments

Unlike wood or light-duty kit frames you would find at big box stores, our aluminum structures are engineered to carry wind uplift and snow compression loads safely.

When a project requires formal engineering, we design the greenhouse specifically for the conditions where it will be installed. Your final work order specifies the design loads we will build to. When required, we provide stamped engineering drawings to support permitting and inspections across North America. You may also request our standard shop drawings to determine if they will satisfy your local planning department.

Heavy-Duty Trussing and Wide Profile Frame Options

For projects requiring enhanced load capacity, we offer upgraded frame systems that include:

  • Wide-profile tubular glazing bars
  • Structural truss systems
  • Larger span capabilities
  • Hidden gusset plates for reinforced roof systems

These structural enhancements are commonly used in high-wind coastal regions, rooftop conservatories, and heavy snow climates.

Read real-world extreme weather stories from BC Greenhouse owners.

A Lifetime Warranty for Peace of Mind

Our lifetime warranty framework reflects our confidence in this engineering but even more, our commitment to our customers. The Lifetime Limited Warranty on frames and structural components, along with warranties on glazing seals and hail resistance, provides assurance that the greenhouse will perform successfully for a lifetime.

Download our Framing Guide for even more detail and information!

BC Greenhouse Framing and Glazing Options

Learn More ➞

Explore the New 2026 Greenhouse Catalog!

Let us guide you through your new greenhouse gardening adventure, every step of the way.

Over 75 Years of Manufacturing the Strongest Greenhouses
Our Online Store Has moved!

We’re proud to share that BC Greenhouse Builders — a long-standing Canadian company — has acquired Charley’s Greenhouse & Garden in Washington State. It’s a feel-good story of Canadian growth!

You’ll now find all your favorite greenhouse supplies and gardening tools in one convenient shop — with simple home delivery across Canada or pickup available from our Surrey, BC facility.

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