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Grandio Summit 12 x 28 Greenhouse

The Grandio Summit 12 x 28 Greenhouse is a beautiful barn-style greenhouse giving you year-round growing space in an attractive, heavy duty aluminum frame and 10mm twin-wall panels.

Engineered to perform in harsh environments. The Grandio Summit’s rugged durability, makes it one of the most insulated greenhouses on the market and it’s barn shape design is both elegant and functional, and allows plenty of growing space.

Made to meet the highest standards of hobby and professional gardeners, the 1.6 mm profile aluminum frame is strong and durable and won’t warp, melt, or crack like the PVC-based barn-style greenhouses. The heavy-duty construction coupled with 10 mm twin-wall polycarbonate panels provides the perfect thickness for winter insulation.

A wide range of features and accessories culminates in a well ventilated growing space with gliding double doors, our superb easy-to-assemble system, and an insulation (R) value of 1.89 and heat loss (U) value of 0.53 resulting in an amazing gardening and greenhouse experience.

The doors are hung from above which eliminates jamming and the door wheels are made from nylon for durability. The door wheel bolt is turned from solid brass with a smooth shank to reduce wear on the wheels.

The doors come standard with a magnetic catch with heavy duty lockable door handles and included key.

Carefully designed, engineered, and built to the highest quality standards. Gardeners of all types will love the combination of strength, quality, features and especially the terrific value the Grandio Greenhouse offers.

Grandio Summit 12 x 28 Greenhouse Features and Specifications:

  • 10mm Twin-Wall Panels
  • (14) Roof Windows
  • Rain Gutters
  • Drain Kit
  • Extreme Snow Load Kit
  • Flat Mount Anchor Kit
  • Moisture Control Kit
  • Height: 9.25′
  • Width: 12′
  • Length: 28′
  • Frame: Heavy duty aluminum.
  • Color: Powder coated green.
  • Panels: 10mm twin-wall UV protected polycarbonate.
  • Door Size: 41.5″ W x 85″ H
  • Doors: Bind-resistant sliding double-doors.
  • Latch: Magnetic latch doors with key lock.
  • Reinforcement: Cross-roof truss and cross corner bracing.
  • Tools: Included
  • Hardware: Stainless steel nuts and bolts.
  • Gutters: Built-in rain gutters.
  • Ventilation: (14) roof vent with adjustable manual openers/latches
  • Vent opening is 18-3/4″ W x 22-3/4” L
  • Frame Warranty: Lifetime
  • Panel Warranty: 10 years

Premium Package Includes:

  • (14) Auto Roof Window Openers
  • (2) Pack of 10 Plant Hangers
  • (2) 8 oz. Brillianize Cleaner with cloth
  • (1) Trellis Kit
  • (1) Drip Kit

Concrete Slab or Wood Deck Installation: If you plan on constructing your Summit on a concrete slab or wooden surface, the included Flat Mount Base Kit will offer solid footing. The Flat Mount Base Kit includes your choice of anchors for concrete slab or wooden surfaces.

In-earth Installation: If you plan to install your Grandio Summit Greenhouse directly into the earth, we highly recommend our Steel Base Kit with Earth L-Bolt Anchor Kit. The Steel Base Kit is powder coated to resist rust and decay and is designed to be buried into the ground or back filled with gravel providing a solid foundation to combat wind and other extreme environments. Just select “Base Kit (Earth L-Bolt Anchor Kit)” when you checkout and you’ll get everything you need.

Click here to view the Grandio Accessories Page

Click here to view additional sizes of the Summit

Click here to view other Grandio Greenhouses

Grandio Greenhouses are very easy to assemble. The tools are provided along with a step-by-step assembly manual and video.

Grandio Greenhouses are all designed to withstand the most hostile environments. Follow the included directions for securing your greenhouse and you’ll enjoy many years of growing with your Grandio.

For people who live in high temperature areas of the country like Arizona, Texas, California, Nevada, or New Mexico we recommend our aluminum shade net. The aluminum shade net reflects the sun on the hottest days to help your greenhouse keep cool.

The automatic roof opener has a metal cylinder containing a mineral which expands when heated. This pushes a piston that opens the vent. As the temperature cools, the mineral shrinks and a spring closes the vent and resets the piston. The opening and closing of the vent is gradual allowing just the right amount of air flow for cooling. No electricity needed.

Polycarbonate is available in several different thicknesses and normally comes in single, double, and triple walled sheets that can vary in thickness from 1 mm to 10 mm. A good rule to remember is that the thicker the panel the better insulation you’ll have for your greenhouse.

The Grandio comes standard with a base that is meant to anchor it in the soil with concrete footers or a duckbill anchor kit. However, it can be mounted to a concrete pad with additional tools and hardware.

Guaranteed Lowest Price. We will not be undersold. Call us to match any other price you find.

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