Sundial GreenHouse – 20′ Wide Straight Wall, Quonset Roof Style
Sundial Greenhouse
Our Sundial Greenhouse is a 20×100 straight wall Greenhouse inspired by the iconic Sundial Bridge in Redding, California, and it is built for strength, airflow, and long term durability. Sundial features 1.58OD 14-gauge metal hoops, complete with a dep collar. The spacing is established at 5ft on center, using three runs of of 1.38OD 16-gauge purlins. All purlins are securely attached with premium aluminum cross-connectors.
Straight Wall, Quonset Roof Greenhouses (Recommended for High Wind Areas)
The Sundial Greenhouse uses a straight wall, Quonset roof design that combines vertical growing space with structural strength and airflow.
Straight Sidewalls – Perfect for shelving, trellising, or tall crops.
Quonset Arch – Smooth airflow, even light distribution, and material efficiency.
Wind Resistance – Engineered to perform in high wind climates.
Better temperature control – Lower air volume allows faster heating, cooling, and ventilation.
🇺🇸 American-Made. Built for Growers. Engineered to Last.
At T3 Greenhouse Supply, we manufacture high-performance Greenhouse kits for commercial agriculture, homesteading, licensed hemp cultivation, and backyard growing.
From 10×12 backyard Greenhouses to 35-foot-wide commercial houses and full gutter-connect projects, every T3 structure is built from heavy-duty U.S.-made galvanized steel, engineered to last decades in the harshest climates. Our Greenhouses are automation-ready and can run ventilation, irrigation, heating, cooling, and light deprivation systems— with optional off-grid solar power.
💪 T3 Greenhouses Outperform the Rest
The Sundial Greenhouse is built using U.S.-made heavy-duty galvanized steel for long-term durability.
🇺🇸 U.S.-Made Heavy-Duty Galvanized Steel – 2-3/8″ and 1-5/8″ structural tubing for maximum strength and longevity.
Optional Powder Coating – Adds style and enhanced corrosion resistance.
High-Performance Plastics – String-reinforced poly film for outer layers, 6 mil clear poly for double-inflation insulation.
Automation-Ready – works with automated greenhouse controllers for precise climate management.
Off-Grid Capable – Solar power packages for farms, homesteads, and remote growing locations.
Custom Engineering – Wet-stamped plans available in all 50 states for agriculture and licensed cultivation facilities.
🦾⚙️ Automation & Off-Grid Options
Automating the Sundial Greenhouse takes everything good about the design and supercharges it, so growers can maintain consistent conditions without constant manual adjustments. With automated ventilation, evaporative cooling, heating, and smart controls, you have a setup that can thrive in blazing summers or freezing winters. With the right system, the internal climate adjusts automatically throughout the day—without you lifting a finger. These Greenhouses are built for growers who want consistency and control without babysitting the thermostat. Whether you’re growing leafy greens in Montana or tropical plants in Texas, this style delivers stable growing conditions and peace of mind.
🌾 Built for Every Type of Grower
The Sundial Greenhouse is built for a wide range of growers, whether you’re running a commercial operation or managing a backyard setup.
Commercial Agriculture – Vegetables, fruits, berries, flowers, herbs, nursery crops.
Specialty Crops – Hemp and other high-value plants.
Backyard & Homestead Growers – Year-round food, flowers, and personal crops.
Schools & Community Gardens – Educational, sustainable agriculture projects.
Light Deprivation Systems
• Heavy-duty U.S. steel frames for structural strength
• Dual output motorized blackout curtains for smooth, reliable coverage
• Works with automated greenhouse controllers for timed cycles or manual operation
• Designed for precision light control to maximize yields
Ventilation and Cooling Packages
• Exhaust Fans – Sized to match your greenhouse:
• 36″ Fans for 20- and 24-foot-wide models.
• 50″ Fans for 30- and 35-foot-wide models.
• 20″ HAF Fans – Provide maximum air throw to eliminate hot spots and strengthen stems.
• Wet Wall Cooling Systems – Various sizes available; we recommend 4×20 wet walls for 30- and 35-foot-wide greenhouses.
• Wet Wall Light Traps – Optional blackout covers for wet wall systems.
Heating Solutions
• LB White 120 Plus & 220 Plus Heaters – High-efficiency heating designed specifically for greenhouses.
• Available in outside end wall mount or interior mount configurations.
• Perfect for year-round production in colder regions.
Greenhouse Plastics & Endwall Coverings
• String-Reinforced Poly Film (10 mil) – Tough, tear-resistant greenhouse covering for long-term durability.
• 6 Mil Clear Poly Film – Used as the lower layer in double-inflation systems for added insulation.
• Polycarbonate Endwalls – Long-lasting, rigid protection with excellent light transmission.
• Polycarbonate + Metal Endwall Options – For added durability, security, and weather resistance.
• Channel & Wiggle Wire Fastening – Aluminum channel with PVC-coated or galvanized wiggle wire for a secure, professional fit.
Solar Power Packages
• Turn Sunlight Into Savings – Harness clean, renewable energy to power your greenhouse or home while cutting utility costs.
• Plug-and-Grow Ready – Pre-wired systems integrate seamlessly with T3 greenhouses, light dep motors, and irrigation automation.
• Expandable Power Options – Scalable packages from off-grid setups to full-power commercial arrays for any growing operation.
• Built for Growers – Weather-resistant, high-efficiency panels and smart inverters designed for year-round reliability.
Automation Options
• Automated Greenhouse Controllers – Control ventilation, heating, irrigation, cooling, and light dep.
• Irrigation & Misting Systems – Climate or timer-controlled for consistent plant health.
• Remote Monitoring – Adjust systems from anywhere via your phone or computer.