The 28' Pro Series is our widest, most heavy-duty greenhouse and high tunnel kit — built for serious growers, commercial market gardeners, and NRCS grant applicants who need a structure that performs season after season. With 14-gauge steel hoops and 5 purlins running the full length, this wide-span series delivers superior strength and generous growing space across all three available styles.
KIT INCLUDES:
All 1-3/8" diameter 14-gauge galvanized steel tubing (hoops/bows)
4' hoop spacing with 14 ft center peak
Ground stakes — 1-3/8" 14-gauge galvanized steel
5 steel purlins — 1-3/8" 16-gauge steel
Stretch the full length of the greenhouse
Offer connection points for all hoops
Clear, 6-mil, 4-year UV-resistant poly film
Covers top and both ends (single layer — Fully Braced and NRCS)
Hardware for all attachments
NRCS style also includes:
5:1 Gear ratio roll-up side walls
Wiggle wire and channel for base and end walls
Engineered to meet USDA NRCS EQIP high tunnel specifications
Four Season style also includes:
Second layer of 6-mil 4-year greenhouse film on top
Small inflator fan to separate layers for insulating air pocket
Wiggle wire and channel for base and end walls
What's not included:
2x4s for perimeter base and end walls
Doors
Ground cover
Irrigation lines
Extended legs are included in all kits, allowing ceiling height to be raised approximately 1 ft.
End walls are left open for your customization. Drive-through doors, windows, or solid — kits can be adapted to fit your specific needs.
