Riga 3 (10 x 11)


This is for the Riga 3 Greenhouse 9′ 8″ W x 10′ 6″ L x 7′ 9″ H

Product Documents


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Step 1 - Wheelbarrow Access Plate

19.5″ W x 21″ L (each side) x 1.75″ in the middle

Wheelbarrow Access Plate

Step 2 - Assembly Facilitation Kit

The Riga XL Assembly Facilitation Kit contains all the tools and supplies you need for a smooth installation of your Riga XL greenhouse. The kit includes 25′ metric tape, a 10mm socket wrench, a 10 mm open wrench, two 20′ J-hook ratchet straps, four window restraint cables, two tubes of Boss 399 silicone caulk, and a permanent marker.

Assembly Facilitation Kit

Step 3 - Heavy Duty Seed Tray

These polypropylene black seeds trays are made in Germany and are perfect for starting seeds in your greenhouse. They are each 24 inches long x 16 inches wide x 3.5 inches deep.  These fit into the bottom shelf.  YOU MUST HAVE THIS SHELF to use these trays.

Heavy Duty Seed Tray

Step 4 - LED Grow Light

The Illumitex Eclipse GEN2 N Bar LED Grow Light Fixture F3 Spectrum comes either with a 9-foot long power cord or without one so that multiple fixtures can be daisy chained together. Each fixture is 4′ long with 12 LEDS and is designed to be installed between 12 inches and 36 inches above the plant canopy. It features 0-10 volt dimming, is damp-rated and dust-resistant, and has a 5 year warranty. The fixture with the plug can be daisy chained and the fixture without a plug includes a 2-foot long cord for daisy chaining.

With Power Cord

No plug - to be daisy chained

Step 5 - Misting System

The misting system offers a convenient way to keep your plants hydrated while lowering the inside temperature of your greenhouse on hot days. The standard system is 14′ long and will work for a 20′ section of greenhouse, though it can be cut down for use in smaller greenhouses. the kit includes 5 misters and ships in 2 pieces with a connector.

Misting System

Step 6 - Plastic Hooks (set of 10)

The moveable plastic hooks come in sets of ten. These snap into the aluminum frame profile and are used for helping orient growing plants such as tomatoes or string beans.

Plastic Hooks (set of 10)

Step 7 - Exhaust Vent

This ventilation system uses a 20 inch exhaust fan with a thermostat to help keep your greenhouse properly ventilated on warm days. The exhaust vent runs on a 110V connection at 3400 CFM and the single speed thermostat runs on either 115V or 230V at 10 amps and 60 hertz.

12" Exhaust Fan

16" Exhaust Fan

20" Exhaust Fan

Step 8 - In-take Shutter Fan

Intake Shutter Vent (for use with Exhaust Fan) allows controlled airflow through greenhouse.

16" In-take Fan

20" In-take Fan

24" In-take Fan


Step 9 - Solar Light

The solar light includes an external solar panel and battery pack with an internal light system to provide plenty of light for working in your greenhouse at night.

Solar Light

Step 10 - Adjustable Hooks (set of 10)

These are perfect for holding lights or flower baskets and other hanging plants.

Adjustable Hooks (set of 10)

Step 11 - Additional Riga Roof Window

Though this Riga greenhouse already includes a sufficient number of windows, extra roof windows are available to provide even more ventilation. Each window is 40 inches x 24 inches and includes an automatic opener. This opener does not require electricity as it has a special paraffin oil cylinder which expands and contracts based on the temperature. The temperature range on the automatic opener is adjustable.

Additional Riga Roof Window

Step 12 - Riga Auto Window Opener

RIGA Automatic Window Opener with quick release “arm” – allows the opener to be disconnected in adverse weather conditions.

Riga Auto Window Opener

Step 13 - Roof Window Wind Restraint

The roof window restraint system for each window includes two 15 inch stainless steel cables with nuts and bolts. They are recommended for customers who live in high wind areas to help prevent sudden gusts of wind from damaging your roof windows

Roof Window Wind Restraint

Step 14 - Sash Lock

This Riga greenhouse already includes enough sash-locks to keep the included roof windows and top halves of the Dutch doors completely shut during inclement weather. Extra sash-locks are available if extra roof windows are purchased or if customers want some extra just as backups.

Sash Lock

Step 15 - Milkhouse Heater

  • 1500 watt
  • 110 volt

Milkhouse Heater

Step 16 - Silicone

Tube of Boss 399 silicone caulk


Step 17 - Riga 3/3s Top Shelf

Top shelf is 10″ W x 10′ 4″

Riga 3/3s Top Shelf

Step 18 - Riga 3/3s Bottom Shelf

Bottom shelf is 25″ W x 10′ 4″ L

Riga 3/3s Bottom Shelf

Step 19 - Riga 3 Foundation Frame

The base kit used when the Riga greenhouse is assembled directly onto the earth without the use of any concrete or pressure-treated wood foundation. It is made of reinforced aluminum for added durability and ensures that the frame is perfectly square. The lip of the base is actually meant to be placed in the ground, and the base kit is not needed when the greenhouse is already being anchored to a wood or concrete base.

Riga 3 Foundation Frame

Step 20 - Riga Drop Door Kit

To raise greenhouse 20″ for stem wall.

Riga Drop Door Kit

SKU: EX-RIGA3 Category:

Order now!   1-800-987-4337

The Riga Greenhouse

The Riga is truly a greenhouse by the European definition of a greenhouse – designed to be used to grow fresh vegetables, herbs and flowers in the middle of winter. While other greenhouses using less than 8 mm twin-wall polycarbonate, are considered to be Season Extenders, to be used when a night frost might be expected during the spring or fall season. At best they can only be used to house established plants during the winter season.

The polycarbonate glazing on the Riga Greenhouse is German made and believed to be of superior quality than the much more common Polygal or GE glazing. And a major advantage of the Riga Greenhouse’s construction method is that the frame profiles are permanently attached to each other, and won’t come loose over time due to wind pressures.

Riga 3

The peak height of almost eight feet allows room for tall plants and growing trees, and there is sufficient interior space for the most avid gardeners. The heavy duty frame is made of reinforced aluminum and the unique “onion” design allows the greenhouse to withstand inclement weather with ease. Nothing short of tornados or hurricanes has ever destroyed a Riga Greenhouse.

The Riga 3 includes a large roof window which has an automatic opener to help keep the interior well-ventilated and at a comfortable temperature. The lockable, Dutch door provides easy access and is designed for quick installation.

The commercial-grade 8mm twin-wall polycarbonate panels on the sides and 10mm twin-wall polycarbonate panels on the front and back provide tremendous insulative value. They are extremely durable and are virtually unbreakable and provide much more efficiency than typical greenhouse panels. Gutters are not needed as the Riga’s unique design naturally diverts water away from the foundation.

The Riga 3 Greenhouse 10 x 11 can be placed on a 20″ stem wall if desired. A door drop down kit is available. With a combination of strong materials and durable hardware, the Riga 3 Greenhouse is by far the strongest greenhouse under $5,000.

Specifications and Features:

  • Exterior dimensions: 9′ 8″ W x 10′ 6″ L x 7′ 9″ H
  • Color: anodized aluminum
  • Floor space: 102 sq. ft.
  • 1 roof window: large 40″ W x 24″ L vent with temperature-adjustable, electricity-free automatic opener
  • 1 rear window is 30″ W x 42″ H with an adjustment arm
  • 8mm twin-wall polycarbonate panels on sides and 10mm twin-wall polycarbonate panels in front and back are UV-protected, have a R-value of 1.61 and 1.89, and are virtually unbreakable
  • Heavy duty aluminum frame is greatly sloped with a high peak to allow rain and snow to easily run off and can easily support the weight of an adult
  • Frame profiles are thicker than comparably priced structures for added strength
  • Constructed so that the frame profiles are attached to each other in a manner that ensures that they will stay intact even in high winds
  • High ratio of paneling to frame width allows for maximum light transmittance
  • Heavy duty rubber seals are used on all windows, doors, and the top and bottom of the large side glazing panels for complete weather sealing
  • Barn style door for easy access includes keyed handle and is 30″ W x 72″ H
  • Tall peak height allows for plenty of working room inside the greenhouse without having to stoop and more room for shelving
  • Gutter and down spouts are not needed because of the unique frame design
  • Includes 4 L-shaped anchor bars which attach to the inside of the frame base profiles to attach the greenhouse to a concrete or wood frame
  • Riga greenhouses have withstood all inclement weather when properly installed and anchored short of tornadoes and hurricanes
  • Designed, engineered, and manufactured by Hoklartherm, the top maker of premium greenhouses and outdoor pavilions in Germany
  • Includes comprehensive assembly manual along with a DVD showing each stage of assembly
  • Assembly usually takes just one weekend with two people (three is preferable) with ordinary household tools as there are no eaves and relatively few connections
  • Maintenance-free design means the Riga only needs occasional washing with a garden hose and recommended annual tightening of all nuts and bolts
  • The optional Foundation Frame is recommended when placing the greenhouse directly on the ground.
  • Friendly technical support available from Exaco for installation help 7 days a week

Why Choose RIGA?

  • The RIGA Greenhouse is designed, engineered, and manufactured in Germany by Hoklartherm, a leading manufacturer of commercial and hobby greenhouses, with 28 years experience.
  • With a combination of strong materials and durable hardware, the Riga Greenhouse is by far the strongest greenhouse under $5,000.
  • The Riga Greenhouse offers more window and door ventilation than another units it is class.
  • The polycarbonate glazing on the Riga Greenhouse is German made and believed to be of superior quality then the much more common Polygal or GE glazing.
  • The Riga Greenhouse comes with an optional two layer shelving system with removable shelf inserts. This allows for tall plants (beans, tomatoes etc.).
  • The optional 6″ high base frame (which is often used to increase the height of the roof), is 2-3″ higher than most competitors.
  • One major advantage of the Riga’s construction method is that the frame profiles are permanently attached to each other, and won’t come loose over time due to wind pressures.
  • German engineering – guaranteed top quality!
  • Optional Shelving: Seed tray/Bench shelf and top shelf are available with strong diagonal support braces – can hold a 160 pound man! White twin-wall polycarbonate shelf inserts can be removed to allow for tall plants such as tomatoes or beans or to allow insertion of heavy-duty seed trays. This greenhouse can flex to your gardening needs throughout the year.
  • The RIGA Greenhouse is attractive and beautiful to look at – fits well in to an upscale garden setting
  • Buying a greenhouse is like buying a car, they vary in cost from cheap to very expensive, the RIGA is a class similar to a Volkswagen/Volvo – stronger, more durable and better insulated, and offers many more features than the better selling brands.
  • The RIGA Greenhouse offers the minimum insulation needed to grow plant year-round – others using less insulation cost too much to heat.
  • RIGA Greenhouse units are available in 5 sizes
  • We recommend you buy one size bigger than you planned.

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