Grandio Summit 12x28 Greenhouse
Is the Summit 12x28 Greenhouse Kit the Solution for Your Year-round Gardening Needs?
The Summit 12x28 Greenhouse Kit is designed to provide an exceptional growing environment, combining strength, space, and insulation in a beautiful barn-style greenhouse. With its heavy-duty aluminum frame and 10mm twin-wall polycarbonate panels, the Summit greenhouse is built to last in any climate. Its barn shape offers plenty of room for plants while adding an elegant touch to any garden.
BENEFITS
- Durable Build for Tough Conditions: Constructed from a sturdy 1.6mm profile aluminum frame, this greenhouse is built to handle harsh weather, ensuring that your plants stay safe. Its rugged design makes it highly reliable, allowing you to enjoy gardening all year long, regardless of the climate.
- Keeps Your Plants Warm All Year: The 10mm twin-wall polycarbonate panels offer excellent insulation, with an R-value of 1.89* and a heat loss U-value of 0.53, helping to retain warmth and reduce energy costs. This makes the Summit an ideal greenhouse for gardeners looking to extend their growing season into cooler months.
- Easy to Use and Access: With sliding double doors that move smoothly and don’t get stuck, getting in and out of the greenhouse is hassle-free. Made with durable materials, the doors also have lockable handles for security, and fourteen roof windows let fresh air circulate to keep your plants healthy.
- Comes with Extra Features: Equipped with rain gutters, a drain kit, a snow load kit, and anchors, this greenhouse is ready for any kind of weather. These features make it an ideal choice for beginners and experienced gardeners alike who want a dependable greenhouse.
The Summit 12x28 Greenhouse Kit combines durability, warmth, and ease of use, giving you a large, protected space for growing plants throughout the year.
SPECIFICATIONS
| Frame | Heavy Duty Aluminum |
| Color | Powder-Coated Green |
| Panels | 10mm Twin-wall UV-protected Polycarbonate |
| Doors | Bind-resistant Sliding Double doors |
| Latch | Magnetic latch doors with key lock |
| Reinforcement | Cross-roof truss and cross-corner bracing |
| Hardware | Stainless steel nuts and bolts |
| Rain Gutters | Yes |
| Ventilation | 14 Roof vents with adjustable manual openers/latches |
| Wind Rating | Withstands winds up to 76 mph* |
| Snow Rating | Maximum snow load of 25lbs./ft² of snow* |
DIMENSIONS
- Actual Size: 12' W x 28' L x 9.25' H
- Door Size: 41.5" W x 85" H
 |
 |
GRANDIO GREENHOUSE MATERIALS VS OTHER BRANDS
WHAT'S INCLUDED IN THE PACKAGE?
Basic Kit Includes:
- 10mm Twin-Wall Panels
- (14) Roof Windows
- Rain Gutters
- Drain Kit
- Extreme Snow Load Kit
- Flat Mount Anchor Kit
Optional Premium Kit Includes:
- 10mm Twin-Wall Panels
- (14) Roof Window
- Rain Gutters
- Base Kit
- Drain Kit
- Extreme Snow Load Kit
- Flat Mount Anchor Kit
- (14) Auto Roof Vent Openers
- (2) Pack of 10 Plant Hangers
- (1) Trellis Kit
- (1) Drip Kit
- (2) 8 oz. Brillianize Cleaner
ASSEMBLY VIDEO
GRANDIO SUMMIT #2 ASSEMBLY INSTRUCTION
Compare Grandio Greenhouse Models
| Feature |
Grandio Ascent 8x24 Greenhouse |
Grandio Elite 8x24 Greenhouse |
Grandio Summit 12x28 Greenhouse |
|---|---|---|---|
| Total Area | 192 sq ft | 192 sq ft | 288 sq ft |
| Peak Height | 7'9" | 8' | 9.25' |
| Sidewall Height | 5'5" | 5'5" | 5'5" |
| Frame Material | Heavy-duty aluminum | Heavy-duty aluminum | Heavy-duty aluminum |
| Panel Material | 6 mm Twin-wall UV-protected Polycarbonate | 10 mm Twin-wall UV-protected Polycarbonate | 10 mm Twin-wall UV-protected Polycarbonate |
| Latch | Easy-latch doors with double-ball catch | Easy-latch doors with double-ball catch | Magnetic latch doors with key lock |
| Door Type | Sliding Double | Sliding Double | Sliding Double |
| Ventilation | (6) Roof vents | (6) Roof vents | (14) Roof vents |
| Warranty | Lifetime frame / 10-year panels | Lifetime frame / 10-year panels | Lifetime frame / 10-year panels |
Compare with Other Greenhouse Brands
| Feature |
Grandio Summit 12x28 Greenhouse |
Riverstone Monticello Black Premium Greenhouse |
EZ-Fit Greenhouse Kit |
Little Cottage Co. Colonial Gable Greenhouse |
|---|---|---|---|---|
| Size | 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, 12x32 | 8x8, 8x12, 8x16, 8x20, 8x24 | 8x8, 8x10, 8x12, 10x12, 10x14, 10x16, 12x16, 12x20, 12x24 | 8x8, 8x12, 8x16, 10x12, 10x14, 10x16 |
| Frame Material | Powder-coated heavy-duty aluminum (1.6 mm thick) | Commercial-grade extruded aluminum (black powder-coated) | LP SmartSide® engineered wood siding with treated wood frame | LP SmartSide® engineered wood siding with treated wood frame |
| Panel Material | 10mm Twin-wall Polycarbonate | 8mm Twin-wall Polycarbonate | Corrugated polycarbonate roofing panels | Corrugated polycarbonate roofing panels |
| Door Type | Sliding double doors | Hinged double doors | Single door with 2 transom windows (Optional Double Door Available) |
Colonial Dutch door with 1 transom window |
| Ventilation | 14 roof vents | 1 Automatic roof vent(s) | Operable windows (with screens) + 2 gable-end air vents | Operable windows (with screens) + 2 gable-end air vents |
| Color | Green powder-coat aluminum frame • clear polycarbonate panels | Black powder-coat aluminum frame • clear polycarbonate panels | Primed and ready to paint | Primed and ready to paint |
| Included Accessories | Rain gutters, snow load kit, anchoring kit | Rain gutters, roof vent, base kit | Shelves on 3 sides | Shelves on 3 sides, hanging rods, 2 louvers |
Optional Accessories
 |
Drain Kit - Downspout for Grandio Greenhouse Gutter Systems, designed for installation at each of the four corners of the greenhouse. It’s made to be installed directly into the aluminum frame and gutter of the greenhouse. The easy-to-install downspout drain kit includes (4) 20mm black pipes, (4) gutter attachment gaskets, and (4) side wall brackets with screws. One kit has everything needed to add downspouts to a Grandio Greenhouse. |
 |
Automatic Roof Vent Opener - Automatically opens and closes the roof vent window based on temperature changes. The opener contains a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. When the temperature cools, the mineral contracts, and a spring closes the vent, resetting the piston. The vent opens and closes gradually, allowing the right amount of airflow for cooling. |
 |
Auto Louver Window Opener - Automatically opens and closes the louver window as the temperature changes. The opener has a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. As the temperature cools, the mineral contracts, and a spring closes the vent and resets the piston. The vent opens and closes gradually, providing just the right amount of airflow for cooling. This Auto Louver Opener attaches to the left side of your louver window. |
 |
Louver Window - add more ventilation to your greenhouse. Louver window frame comes powder coated in green, with 6mm twin wall polycarbonate panels. |
 |
The Drip Irrigation Watering Kit - is a water-efficient system designed for shrubs, trees, flowers, and bushes, covering up to 150 square feet with easy expandability. It's a DIY-friendly installation with no gluing required, using high-quality UV-resistant materials. The kit includes 24 pressure-compensating drippers (20 at 1 GPH, 2 at 2 GPH, and 2 at 4 GPH) for consistent water delivery to plant roots. A backflow preventer ensures water safety by preventing siphoning into the main supply. |
 |
Moisture Control Kit - featuring Anti Dust Tape and Waterproof All-Weather Silicone Caulk, protects your Grandio Greenhouse from insects, dirt, mold, and algae. The tape's 45-micron filters allow condensation to escape while preventing algae and mold growth with a fungicidal coating. Combined with the silicone caulk, this kit ensures long-lasting protection and maintains the greenhouse's pristine condition. |
 |
Shade Net - are essential for regulating greenhouse temperatures, especially during sunny spring, autumn, and summer days. Designed to reduce intense sunlight by 50%, they help keep your greenhouse cooler and prevent overheating. |
 |
Plant Hangers - These versatile plastic hangers are designed for greenhouse use, supporting shade cloths, hanging baskets with quarter-inch hooks, and stringing taller plants or vines. Easy to install, they simply twist into the roof rafter channels. |
SHIPPING INFO
Lead Time is 1 to 2 days. Orders typically arrive within 1-7 business days, depending on your location:
- West: 2-4 days
- Northwest: 1-3 days
- Southwest: 3-5 days
- Midwest: 4-6 days
- East: 5-7 days
Note: Delivery times are estimates and exclude order processing time. Delays may occur due to weather or carrier issues.
Frequently Asked Questions
What sizes are available for the Grandio Summit Greenhouse?
The Grandio Summit Greenhouse is available in multiple sizes: 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, and 12x32. All models feature the same barn-style frame and 10mm twin-wall polycarbonate panels.
How strong is the Grandio Summit greenhouse frame?
The Summit uses a 1.6mm thick heavy-duty aluminum frame with cross-roof truss and corner bracing. It is rated to withstand winds up to 76 mph and snow loads up to 25 lbs/ft² with the included snow load kit.
What kind of panels are used in the Summit greenhouse?
The greenhouse uses 10mm twin-wall UV-protected polycarbonate panels that offer an R-value of 1.89 and a U-value of 0.53 for excellent insulation and plant protection.
Does the Summit come with built-in ventilation?
Yes. All Summit models come with 16 roof vents featuring manual openers. Optional automatic vent openers and louver window kits are also available for improved airflow control.
Are the doors easy to operate?
Yes. The Summit features bind-resistant sliding double doors with high-quality nylon wheels and brass bolts for smooth, long-lasting operation. Doors are also lockable with magnetic latches for added security.
What accessories are included with the greenhouse?
All Summit kits include rain gutters, a drain kit, a snow load kit, and a flat mount anchor kit. Premium kits add automatic roof vent openers, plant hangers, a trellis kit, a drip irrigation system, and more.
Can the Summit be installed on different foundations?
Yes. The Summit can be mounted on a concrete pad, wood base, or directly onto level ground using the included anchor kits. Detailed installation manuals and videos are provided to guide you through the process.
Is this greenhouse suitable for cold climates?
Absolutely. With 10mm panels, a high R-value, and the included snow load kit, the Grandio Summit is ideal for year-round gardening—even in harsh winter conditions.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Grandio Summit 12x28 Greenhouse
Grandio Summit 12x28 Greenhouse
Is the Summit 12x28 Greenhouse Kit the Solution for Your Year-round Gardening Needs?
The Summit 12x28 Greenhouse Kit is designed to provide an exceptional growing environment, combining strength, space, and insulation in a beautiful barn-style greenhouse. With its heavy-duty aluminum frame and 10mm twin-wall polycarbonate panels, the Summit greenhouse is built to last in any climate. Its barn shape offers plenty of room for plants while adding an elegant touch to any garden.
BENEFITS
- Durable Build for Tough Conditions: Constructed from a sturdy 1.6mm profile aluminum frame, this greenhouse is built to handle harsh weather, ensuring that your plants stay safe. Its rugged design makes it highly reliable, allowing you to enjoy gardening all year long, regardless of the climate.
- Keeps Your Plants Warm All Year: The 10mm twin-wall polycarbonate panels offer excellent insulation, with an R-value of 1.89* and a heat loss U-value of 0.53, helping to retain warmth and reduce energy costs. This makes the Summit an ideal greenhouse for gardeners looking to extend their growing season into cooler months.
- Easy to Use and Access: With sliding double doors that move smoothly and don’t get stuck, getting in and out of the greenhouse is hassle-free. Made with durable materials, the doors also have lockable handles for security, and fourteen roof windows let fresh air circulate to keep your plants healthy.
- Comes with Extra Features: Equipped with rain gutters, a drain kit, a snow load kit, and anchors, this greenhouse is ready for any kind of weather. These features make it an ideal choice for beginners and experienced gardeners alike who want a dependable greenhouse.
The Summit 12x28 Greenhouse Kit combines durability, warmth, and ease of use, giving you a large, protected space for growing plants throughout the year.
SPECIFICATIONS
| Frame | Heavy Duty Aluminum |
| Color | Powder-Coated Green |
| Panels | 10mm Twin-wall UV-protected Polycarbonate |
| Doors | Bind-resistant Sliding Double doors |
| Latch | Magnetic latch doors with key lock |
| Reinforcement | Cross-roof truss and cross-corner bracing |
| Hardware | Stainless steel nuts and bolts |
| Rain Gutters | Yes |
| Ventilation | 14 Roof vents with adjustable manual openers/latches |
| Wind Rating | Withstands winds up to 76 mph* |
| Snow Rating | Maximum snow load of 25lbs./ft² of snow* |
DIMENSIONS
- Actual Size: 12' W x 28' L x 9.25' H
- Door Size: 41.5" W x 85" H
|
|
GRANDIO GREENHOUSE MATERIALS VS OTHER BRANDS
WHAT'S INCLUDED IN THE PACKAGE?
Basic Kit Includes:
- 10mm Twin-Wall Panels
- (14) Roof Windows
- Rain Gutters
- Drain Kit
- Extreme Snow Load Kit
- Flat Mount Anchor Kit
Optional Premium Kit Includes:
- 10mm Twin-Wall Panels
- (14) Roof Window
- Rain Gutters
- Base Kit
- Drain Kit
- Extreme Snow Load Kit
- Flat Mount Anchor Kit
- (14) Auto Roof Vent Openers
- (2) Pack of 10 Plant Hangers
- (1) Trellis Kit
- (1) Drip Kit
- (2) 8 oz. Brillianize Cleaner
ASSEMBLY VIDEO
GRANDIO SUMMIT #2 ASSEMBLY INSTRUCTION
Compare Grandio Greenhouse Models
| Feature |
Grandio Ascent 8x24 Greenhouse |
Grandio Elite 8x24 Greenhouse |
Grandio Summit 12x28 Greenhouse |
|---|---|---|---|
| Total Area | 192 sq ft | 192 sq ft | 288 sq ft |
| Peak Height | 7'9" | 8' | 9.25' |
| Sidewall Height | 5'5" | 5'5" | 5'5" |
| Frame Material | Heavy-duty aluminum | Heavy-duty aluminum | Heavy-duty aluminum |
| Panel Material | 6 mm Twin-wall UV-protected Polycarbonate | 10 mm Twin-wall UV-protected Polycarbonate | 10 mm Twin-wall UV-protected Polycarbonate |
| Latch | Easy-latch doors with double-ball catch | Easy-latch doors with double-ball catch | Magnetic latch doors with key lock |
| Door Type | Sliding Double | Sliding Double | Sliding Double |
| Ventilation | (6) Roof vents | (6) Roof vents | (14) Roof vents |
| Warranty | Lifetime frame / 10-year panels | Lifetime frame / 10-year panels | Lifetime frame / 10-year panels |
Compare with Other Greenhouse Brands
| Feature |
Grandio Summit 12x28 Greenhouse |
Riverstone Monticello Black Premium Greenhouse |
EZ-Fit Greenhouse Kit |
Little Cottage Co. Colonial Gable Greenhouse |
|---|---|---|---|---|
| Size | 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, 12x32 | 8x8, 8x12, 8x16, 8x20, 8x24 | 8x8, 8x10, 8x12, 10x12, 10x14, 10x16, 12x16, 12x20, 12x24 | 8x8, 8x12, 8x16, 10x12, 10x14, 10x16 |
| Frame Material | Powder-coated heavy-duty aluminum (1.6 mm thick) | Commercial-grade extruded aluminum (black powder-coated) | LP SmartSide® engineered wood siding with treated wood frame | LP SmartSide® engineered wood siding with treated wood frame |
| Panel Material | 10mm Twin-wall Polycarbonate | 8mm Twin-wall Polycarbonate | Corrugated polycarbonate roofing panels | Corrugated polycarbonate roofing panels |
| Door Type | Sliding double doors | Hinged double doors | Single door with 2 transom windows (Optional Double Door Available) |
Colonial Dutch door with 1 transom window |
| Ventilation | 14 roof vents | 1 Automatic roof vent(s) | Operable windows (with screens) + 2 gable-end air vents | Operable windows (with screens) + 2 gable-end air vents |
| Color | Green powder-coat aluminum frame • clear polycarbonate panels | Black powder-coat aluminum frame • clear polycarbonate panels | Primed and ready to paint | Primed and ready to paint |
| Included Accessories | Rain gutters, snow load kit, anchoring kit | Rain gutters, roof vent, base kit | Shelves on 3 sides | Shelves on 3 sides, hanging rods, 2 louvers |
Optional Accessories
|
Drain Kit - Downspout for Grandio Greenhouse Gutter Systems, designed for installation at each of the four corners of the greenhouse. It’s made to be installed directly into the aluminum frame and gutter of the greenhouse. The easy-to-install downspout drain kit includes (4) 20mm black pipes, (4) gutter attachment gaskets, and (4) side wall brackets with screws. One kit has everything needed to add downspouts to a Grandio Greenhouse. |
|
|
Automatic Roof Vent Opener - Automatically opens and closes the roof vent window based on temperature changes. The opener contains a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. When the temperature cools, the mineral contracts, and a spring closes the vent, resetting the piston. The vent opens and closes gradually, allowing the right amount of airflow for cooling. |
|
|
Auto Louver Window Opener - Automatically opens and closes the louver window as the temperature changes. The opener has a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. As the temperature cools, the mineral contracts, and a spring closes the vent and resets the piston. The vent opens and closes gradually, providing just the right amount of airflow for cooling. This Auto Louver Opener attaches to the left side of your louver window. |
|
|
Louver Window - add more ventilation to your greenhouse. Louver window frame comes powder coated in green, with 6mm twin wall polycarbonate panels. |
|
|
The Drip Irrigation Watering Kit - is a water-efficient system designed for shrubs, trees, flowers, and bushes, covering up to 150 square feet with easy expandability. It's a DIY-friendly installation with no gluing required, using high-quality UV-resistant materials. The kit includes 24 pressure-compensating drippers (20 at 1 GPH, 2 at 2 GPH, and 2 at 4 GPH) for consistent water delivery to plant roots. A backflow preventer ensures water safety by preventing siphoning into the main supply. |
|
|
Moisture Control Kit - featuring Anti Dust Tape and Waterproof All-Weather Silicone Caulk, protects your Grandio Greenhouse from insects, dirt, mold, and algae. The tape's 45-micron filters allow condensation to escape while preventing algae and mold growth with a fungicidal coating. Combined with the silicone caulk, this kit ensures long-lasting protection and maintains the greenhouse's pristine condition. |
|
|
Shade Net - are essential for regulating greenhouse temperatures, especially during sunny spring, autumn, and summer days. Designed to reduce intense sunlight by 50%, they help keep your greenhouse cooler and prevent overheating. |
|
|
Plant Hangers - These versatile plastic hangers are designed for greenhouse use, supporting shade cloths, hanging baskets with quarter-inch hooks, and stringing taller plants or vines. Easy to install, they simply twist into the roof rafter channels. |
SHIPPING INFO
Lead Time is 1 to 2 days. Orders typically arrive within 1-7 business days, depending on your location:
- West: 2-4 days
- Northwest: 1-3 days
- Southwest: 3-5 days
- Midwest: 4-6 days
- East: 5-7 days
Note: Delivery times are estimates and exclude order processing time. Delays may occur due to weather or carrier issues.
Frequently Asked Questions
What sizes are available for the Grandio Summit Greenhouse?
The Grandio Summit Greenhouse is available in multiple sizes: 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, and 12x32. All models feature the same barn-style frame and 10mm twin-wall polycarbonate panels.
How strong is the Grandio Summit greenhouse frame?
The Summit uses a 1.6mm thick heavy-duty aluminum frame with cross-roof truss and corner bracing. It is rated to withstand winds up to 76 mph and snow loads up to 25 lbs/ft² with the included snow load kit.
What kind of panels are used in the Summit greenhouse?
The greenhouse uses 10mm twin-wall UV-protected polycarbonate panels that offer an R-value of 1.89 and a U-value of 0.53 for excellent insulation and plant protection.
Does the Summit come with built-in ventilation?
Yes. All Summit models come with 16 roof vents featuring manual openers. Optional automatic vent openers and louver window kits are also available for improved airflow control.
Are the doors easy to operate?
Yes. The Summit features bind-resistant sliding double doors with high-quality nylon wheels and brass bolts for smooth, long-lasting operation. Doors are also lockable with magnetic latches for added security.
What accessories are included with the greenhouse?
All Summit kits include rain gutters, a drain kit, a snow load kit, and a flat mount anchor kit. Premium kits add automatic roof vent openers, plant hangers, a trellis kit, a drip irrigation system, and more.
Can the Summit be installed on different foundations?
Yes. The Summit can be mounted on a concrete pad, wood base, or directly onto level ground using the included anchor kits. Detailed installation manuals and videos are provided to guide you through the process.
Is this greenhouse suitable for cold climates?
Absolutely. With 10mm panels, a high R-value, and the included snow load kit, the Grandio Summit is ideal for year-round gardening—even in harsh winter conditions.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Is the Summit 12x28 Greenhouse Kit the Solution for Your Year-round Gardening Needs?
The Summit 12x28 Greenhouse Kit is designed to provide an exceptional growing environment, combining strength, space, and insulation in a beautiful barn-style greenhouse. With its heavy-duty aluminum frame and 10mm twin-wall polycarbonate panels, the Summit greenhouse is built to last in any climate. Its barn shape offers plenty of room for plants while adding an elegant touch to any garden.
BENEFITS
- Durable Build for Tough Conditions: Constructed from a sturdy 1.6mm profile aluminum frame, this greenhouse is built to handle harsh weather, ensuring that your plants stay safe. Its rugged design makes it highly reliable, allowing you to enjoy gardening all year long, regardless of the climate.
- Keeps Your Plants Warm All Year: The 10mm twin-wall polycarbonate panels offer excellent insulation, with an R-value of 1.89* and a heat loss U-value of 0.53, helping to retain warmth and reduce energy costs. This makes the Summit an ideal greenhouse for gardeners looking to extend their growing season into cooler months.
- Easy to Use and Access: With sliding double doors that move smoothly and don’t get stuck, getting in and out of the greenhouse is hassle-free. Made with durable materials, the doors also have lockable handles for security, and fourteen roof windows let fresh air circulate to keep your plants healthy.
- Comes with Extra Features: Equipped with rain gutters, a drain kit, a snow load kit, and anchors, this greenhouse is ready for any kind of weather. These features make it an ideal choice for beginners and experienced gardeners alike who want a dependable greenhouse.
The Summit 12x28 Greenhouse Kit combines durability, warmth, and ease of use, giving you a large, protected space for growing plants throughout the year.
SPECIFICATIONS
| Frame | Heavy Duty Aluminum |
| Color | Powder-Coated Green |
| Panels | 10mm Twin-wall UV-protected Polycarbonate |
| Doors | Bind-resistant Sliding Double doors |
| Latch | Magnetic latch doors with key lock |
| Reinforcement | Cross-roof truss and cross-corner bracing |
| Hardware | Stainless steel nuts and bolts |
| Rain Gutters | Yes |
| Ventilation | 14 Roof vents with adjustable manual openers/latches |
| Wind Rating | Withstands winds up to 76 mph* |
| Snow Rating | Maximum snow load of 25lbs./ft² of snow* |
DIMENSIONS
- Actual Size: 12' W x 28' L x 9.25' H
- Door Size: 41.5" W x 85" H
|
|
GRANDIO GREENHOUSE MATERIALS VS OTHER BRANDS
WHAT'S INCLUDED IN THE PACKAGE?
Basic Kit Includes:
- 10mm Twin-Wall Panels
- (14) Roof Windows
- Rain Gutters
- Drain Kit
- Extreme Snow Load Kit
- Flat Mount Anchor Kit
Optional Premium Kit Includes:
- 10mm Twin-Wall Panels
- (14) Roof Window
- Rain Gutters
- Base Kit
- Drain Kit
- Extreme Snow Load Kit
- Flat Mount Anchor Kit
- (14) Auto Roof Vent Openers
- (2) Pack of 10 Plant Hangers
- (1) Trellis Kit
- (1) Drip Kit
- (2) 8 oz. Brillianize Cleaner
ASSEMBLY VIDEO
GRANDIO SUMMIT #2 ASSEMBLY INSTRUCTION
Compare Grandio Greenhouse Models
| Feature |
Grandio Ascent 8x24 Greenhouse |
Grandio Elite 8x24 Greenhouse |
Grandio Summit 12x28 Greenhouse |
|---|---|---|---|
| Total Area | 192 sq ft | 192 sq ft | 288 sq ft |
| Peak Height | 7'9" | 8' | 9.25' |
| Sidewall Height | 5'5" | 5'5" | 5'5" |
| Frame Material | Heavy-duty aluminum | Heavy-duty aluminum | Heavy-duty aluminum |
| Panel Material | 6 mm Twin-wall UV-protected Polycarbonate | 10 mm Twin-wall UV-protected Polycarbonate | 10 mm Twin-wall UV-protected Polycarbonate |
| Latch | Easy-latch doors with double-ball catch | Easy-latch doors with double-ball catch | Magnetic latch doors with key lock |
| Door Type | Sliding Double | Sliding Double | Sliding Double |
| Ventilation | (6) Roof vents | (6) Roof vents | (14) Roof vents |
| Warranty | Lifetime frame / 10-year panels | Lifetime frame / 10-year panels | Lifetime frame / 10-year panels |
Compare with Other Greenhouse Brands
| Feature |
Grandio Summit 12x28 Greenhouse |
Riverstone Monticello Black Premium Greenhouse |
EZ-Fit Greenhouse Kit |
Little Cottage Co. Colonial Gable Greenhouse |
|---|---|---|---|---|
| Size | 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, 12x32 | 8x8, 8x12, 8x16, 8x20, 8x24 | 8x8, 8x10, 8x12, 10x12, 10x14, 10x16, 12x16, 12x20, 12x24 | 8x8, 8x12, 8x16, 10x12, 10x14, 10x16 |
| Frame Material | Powder-coated heavy-duty aluminum (1.6 mm thick) | Commercial-grade extruded aluminum (black powder-coated) | LP SmartSide® engineered wood siding with treated wood frame | LP SmartSide® engineered wood siding with treated wood frame |
| Panel Material | 10mm Twin-wall Polycarbonate | 8mm Twin-wall Polycarbonate | Corrugated polycarbonate roofing panels | Corrugated polycarbonate roofing panels |
| Door Type | Sliding double doors | Hinged double doors | Single door with 2 transom windows (Optional Double Door Available) |
Colonial Dutch door with 1 transom window |
| Ventilation | 14 roof vents | 1 Automatic roof vent(s) | Operable windows (with screens) + 2 gable-end air vents | Operable windows (with screens) + 2 gable-end air vents |
| Color | Green powder-coat aluminum frame • clear polycarbonate panels | Black powder-coat aluminum frame • clear polycarbonate panels | Primed and ready to paint | Primed and ready to paint |
| Included Accessories | Rain gutters, snow load kit, anchoring kit | Rain gutters, roof vent, base kit | Shelves on 3 sides | Shelves on 3 sides, hanging rods, 2 louvers |
Optional Accessories
|
Drain Kit - Downspout for Grandio Greenhouse Gutter Systems, designed for installation at each of the four corners of the greenhouse. It’s made to be installed directly into the aluminum frame and gutter of the greenhouse. The easy-to-install downspout drain kit includes (4) 20mm black pipes, (4) gutter attachment gaskets, and (4) side wall brackets with screws. One kit has everything needed to add downspouts to a Grandio Greenhouse. |
|
|
Automatic Roof Vent Opener - Automatically opens and closes the roof vent window based on temperature changes. The opener contains a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. When the temperature cools, the mineral contracts, and a spring closes the vent, resetting the piston. The vent opens and closes gradually, allowing the right amount of airflow for cooling. |
|
|
Auto Louver Window Opener - Automatically opens and closes the louver window as the temperature changes. The opener has a metal cylinder with a mineral that expands when heated, pushing a piston to open the vent. As the temperature cools, the mineral contracts, and a spring closes the vent and resets the piston. The vent opens and closes gradually, providing just the right amount of airflow for cooling. This Auto Louver Opener attaches to the left side of your louver window. |
|
|
Louver Window - add more ventilation to your greenhouse. Louver window frame comes powder coated in green, with 6mm twin wall polycarbonate panels. |
|
|
The Drip Irrigation Watering Kit - is a water-efficient system designed for shrubs, trees, flowers, and bushes, covering up to 150 square feet with easy expandability. It's a DIY-friendly installation with no gluing required, using high-quality UV-resistant materials. The kit includes 24 pressure-compensating drippers (20 at 1 GPH, 2 at 2 GPH, and 2 at 4 GPH) for consistent water delivery to plant roots. A backflow preventer ensures water safety by preventing siphoning into the main supply. |
|
|
Moisture Control Kit - featuring Anti Dust Tape and Waterproof All-Weather Silicone Caulk, protects your Grandio Greenhouse from insects, dirt, mold, and algae. The tape's 45-micron filters allow condensation to escape while preventing algae and mold growth with a fungicidal coating. Combined with the silicone caulk, this kit ensures long-lasting protection and maintains the greenhouse's pristine condition. |
|
|
Shade Net - are essential for regulating greenhouse temperatures, especially during sunny spring, autumn, and summer days. Designed to reduce intense sunlight by 50%, they help keep your greenhouse cooler and prevent overheating. |
|
|
Plant Hangers - These versatile plastic hangers are designed for greenhouse use, supporting shade cloths, hanging baskets with quarter-inch hooks, and stringing taller plants or vines. Easy to install, they simply twist into the roof rafter channels. |
SHIPPING INFO
Lead Time is 1 to 2 days. Orders typically arrive within 1-7 business days, depending on your location:
- West: 2-4 days
- Northwest: 1-3 days
- Southwest: 3-5 days
- Midwest: 4-6 days
- East: 5-7 days
Note: Delivery times are estimates and exclude order processing time. Delays may occur due to weather or carrier issues.
Frequently Asked Questions
What sizes are available for the Grandio Summit Greenhouse?
The Grandio Summit Greenhouse is available in multiple sizes: 12x8, 12x12, 12x16, 12x20, 12x24, 12x28, and 12x32. All models feature the same barn-style frame and 10mm twin-wall polycarbonate panels.
How strong is the Grandio Summit greenhouse frame?
The Summit uses a 1.6mm thick heavy-duty aluminum frame with cross-roof truss and corner bracing. It is rated to withstand winds up to 76 mph and snow loads up to 25 lbs/ft² with the included snow load kit.
What kind of panels are used in the Summit greenhouse?
The greenhouse uses 10mm twin-wall UV-protected polycarbonate panels that offer an R-value of 1.89 and a U-value of 0.53 for excellent insulation and plant protection.
Does the Summit come with built-in ventilation?
Yes. All Summit models come with 16 roof vents featuring manual openers. Optional automatic vent openers and louver window kits are also available for improved airflow control.
Are the doors easy to operate?
Yes. The Summit features bind-resistant sliding double doors with high-quality nylon wheels and brass bolts for smooth, long-lasting operation. Doors are also lockable with magnetic latches for added security.
What accessories are included with the greenhouse?
All Summit kits include rain gutters, a drain kit, a snow load kit, and a flat mount anchor kit. Premium kits add automatic roof vent openers, plant hangers, a trellis kit, a drip irrigation system, and more.
Can the Summit be installed on different foundations?
Yes. The Summit can be mounted on a concrete pad, wood base, or directly onto level ground using the included anchor kits. Detailed installation manuals and videos are provided to guide you through the process.
Is this greenhouse suitable for cold climates?
Absolutely. With 10mm panels, a high R-value, and the included snow load kit, the Grandio Summit is ideal for year-round gardening—even in harsh winter conditions.
