Guide To Assembling A Juliana Greenhouse

If you're a general gardener then you may be a little caution when it comes to setting up and installing your own Greenhouse. Robert Hall explores the basic procedures and instructions for erecting a Juliana greenhouse within your garden and the steps involved from base preparation to the final touches.

Created by Andrew Taylor on Monday, 13th of July, 2015.
Updated on Thursday, 17th of September, 2015.


We take a look into the in's and out's of how to assemble a Juliana greenhouse along with some detailed steps to help the process run smoothly. For a 'typical' greenhouse such as from the Juliana Compact, Premium or Gardener ranges, you should be looking at around a 2-4 day timescale for completion for the entire procedure, this would include base preparation and erection.

Our guide below will be based on erecting a Julina greenhouse on a concrete base, so depending on your installation area, your procedure may differ but the main concept will most likely be similar. But before you get started, take a look at the needed tools required to ensure installation is as simple and swift as possible -

  • Pipes for the Concrete Base (if applicable)
  • Spirit Level
  • Cement/Gravel
  • Spade
  • Tape Measure
  • Pliers
  • 10mm Wrench

Stage One - Foundation and Base

It's important that the greenhouse is mounted on a strong base/foundation that is well embedded in the ground.

It has to be leveled and in perfect angle, in order to avoid any difficulty arising during the assembly. Especially during the mounting of glass or polycarbonate.

Once again it's important to keep in mind that this guide is a general tutorial on the assembly. Please always make sure to follow the assembly manual of the greenhouse in possession.

1: Preparation of the ground
First, start preparing the ground at the location of the greenhouse. It's important that the area is leveled and even.

2: Inspect the base/foundation
The base will typically be wrapped in clear foil packaging. Inspect for damages.

3: Inspect the model and size of the base
The base/foundation is labeled with the model name and size.
Make sure that you have received the correct foundation by comparing with the order confirmation/invoice.

4: Inspect the physical dimensions
Inspect the dimensions and measures of the physical base by comparing them with the information in the assembly manual.
Do this before beginning the actual digging in the ground and embedment of the base.

5: Assemble the base
Assemble the base using the included embedment fittings.
Besides on the corners, mount the embedment fittings on the middle of the sides of the base aswell, on bases larger than 9m2.

6: Place the base
Place the base on the ground, at the exact desired location of the greenhouse.

7: Perform diagonal measures
Perform diagonal measures on the base, to ensure absolute levelness. The two diagonal measures has to be the same.
Compare the measures to the ones in the actual assembly manual that is included in the greenhouse packaging.

8: Mark the corners
Mark the corners of the base by placing a stick in the ground at the exact location of the embedment fittings, so that you know where to dig. Then remove the base all together.

9: Dig or drill the holes
Dig or drill the holes, where the base will be embedded. The holes has to have a depth of a minimum of 80 cm, to ensure embedment in frostless depth.

Once the pipes are placed in the holes, sand has to be poured at the bottom of the pipes. If leveling is needed during the embedment, the pipes can simply be lifted up a bit so that the sand runs out of the pipe and thereby causing the pipe to raise up accordingly.

10: Bend the embedment fittings
Before you place the embedment fittings down the pipes, bend them in the end using a plier as shown in the image on the left.
This ensures a better stability once the base is embedded in the ground.

11: Inspect level and diagonal measures
Inspect the levels and diagonal measures of the base.
It's very important that the base is entirely in level and both of the diagonal measures are the exact same.

12: Pour cement in the holes and let harden
Pour cement into the pipes and holes and let it harden for about 24 hours of time.
Don't mix too much water in the cement mixture; the less water, the firmer the cement.

Stage Two - The Greenhouse Erection

Before beginning the assembly of the greenhouse-profiles it's of utmost importance that you read through the assembly manual thorougly and also use it as a reference during the whole assembly process.
Being two or more during the assembly is highly recommended. Especially once the gables and sides has to be screwed together.

1: Inspect the packages
Ensure that you have received all the correct profiles by inspecting the packages and contents of them.
The profiles come in one or more packages.

Once again it's important to always follow the guidelines of the assembly manual. The following is strictly a general illustrative tutorial of the assembly of a greenhouse.

2: Gain an overview of the profiles
Gain an overview of the profiles by first laying them out on the ground before beginning to screw them together. Start with the gables first.

Once the profiles lay on the ground begin screwing them together in the same order stated in the particular assembly manual for your greenhouse.

3: Place the assembled gables aside
Place the gables aside once they are assembled.

4: Assembly of the sides
Now it's time to assemble the profiles that make up the sides of the greenhouse.
They are assembled the same way as the gables.

5: Gables and sides are now screwed together.
Screw the gables and sides together on a leveled surface/ground. Once the gables and sides are assembled and screwed together, lift and place the entire greenhouse on top of the base.

If you are short of space you can also do the assembly and screwing of the sides and gables on top of the base, but it's quite difficult and should be avoided.

To ease the assembly of the sides and gables, the screws in the corner of the gable can be loosened so that the profiles can be pushed in to place.

6: Mount the greenhouse to the base
The greenhouse can be mounted on the base with the included fittings.
If you've built your own base, the greenhouse has to be attached to the base by screwing together each section of the greenhouse base frame.

7: The greenhouse ridge is mounted
Loosen the bolts on top of the gable so that the ridge can be pushed in to place.

8: Roof is mounted
The roof profiles are mounted to the ridge and eaves of the greenhouse.

9: Assemble roof vents
Now it's time for the assembly of the roof vents.

10: Push the hinge strip of the roof vent in to place
Place the hinge strip of the roof vents in to the ridge and push it in to place at the desired section.

11: Assemble the door
Now it's time to assemble the door.
Gain an overview of the profiles by laying them on the ground before assembling them together.

12: Inspect the level and diagonal measures
Before mounting in the doors, make sure that the greenhouse is in level and has the correct diagonal measures and angles.

13: Mount the door
Now you can carefully mount the door on the greenhouse. The greenhouse is now ready for step 3, which is glazing the greenhouse.

Stage Three (Part A) - Glass Installation

Before you begin mounting the glass it's very important that you use gloves for your own safety in order to avoid cutting yourself.
Start mounting the glass on the roof, then the sides and finish off with the gables.
Once again make sure that you are following the official assembly manual for the particular greenhouse.
There you will also be able to find information on where what type (dimension) of glass has to be mounted.

1: Degrease with Acetone
Before you start mounting the glass with silicone, begin degreasing the aluminium profiles with acetone.
This will help the silicone bind the glas to the profiles.

2: Apply silicone
Apply silicone on particular spots according to the assembly manual.
PLEASE NOTE: IN THE UK JULIANA GREENHOUSES ARE SUPPLIED WITH RUBBER GLAZING GASKET.

3: Degrease the glass
Deagrease the glass aswell with Acetone, so that optimal attachment is ensured.

4: Mount in the glass
Mount in the glass in to the silicone on the profiles.

5: Mount in the glazing clips
Mount the glazing clips by pushing it in between the glass and aluminium profile. In the UK Juliana Greenhouses are supplied with glazing capping istead of clips.

6: Mount the overlap clips
Mount the overlap clips in the bottom glass sections. In the UK Juliana Greenhouses are supplied with full length glazing. 

7: Mount the overlapping glass
Once you have mounted two overlapping clips on the bottom glass section, you can carefully mount the overlapping glass on the clips.

8: Mount the upper glass sections
Mount the upper glass sections now.
The overlapping part of the glass needs to be carefully pushed in to the aluminium profiles and pressed in so that the silicone binds.

9: Bend the overlapping clips
Now it's time to bend the overlapping clips to ensure stable hold.

Stage Three (Part B) - Polycarbonate Glazing

Polycarbonate (PC) is alot easier to mount on the greenhouse than glass due to the whole sheets.
Follow the instructions in the assembly manual for your particular greenhouse in order to identify which PC sheets goes where.
For the this task you will need Acetone, sandpaper and a little saw, utility knife or "scissor".
Start mounting the roof sheets, then the sides and finish off with the gables.

1: Degrease greenhouse profiles
First, degrease the profiles which the polycarbonate has to be mounted on with Acetone.
This ensures that the silicone binds well to the profiles.
NOTICE: Silicone is not necessary on sheets with a thickness of 6mm or 10mm. In which case you can skip this step.

2: Inspect the surface of the PC sheet
Inspect which surface of the polycarbonate sheet has to face externally.
The sheets are only UV protected on one surface. It's marked with a label.
Ensure a crrect installation of the sheets or else they will fade in color and finish fter a few years.

3: Remove the protection foil
Remove the protection foils from the PC sheet.

4: Leave label on the outside
Leave the label on the outside surface of the polycarbonate sheet.

5: Sand the edges
Sand the edges of the sheets. This ensures that the silicone binds once it's glued on to the profiles.
NOTICE: Silicone is not necessary on sheets with a thickness of 6mm or 10mm. In which case you can skip this step.

6: Apply the silicone
Apply the silicone (in case of 4mm thick PC sheets).
A 3mm thick line of silicone is applied on the profiles.
NOTICE: Silicone is not necessary on sheets with a thickness of 6mm or 10mm. In which case you can skip this step.

7: Installation of the plastic molding strips
On the top profiles, the plastic molding strips are installed.

8: Installation of the bottom plastic molding strips
Plastic molding strips are also installed on the bottom profiles.

9: Install the sheets on the bottom first
The PC sheets are first installed on the bottom first.
REMEMBER: Turn the correct surface outwards. The one with the label on.

10: Press in the PC sheet on the top aswell
The PC sheet is then pressed in on the top aswell, into the upper plastic molding strips.
REMEMBER: Turn the correct surface outwards. The one with the label on.

11: Installation of the edge molding strips
The plastic molding strips are then installed on the edges of the PC sheets.
Start from the bottom and press upward. The "Clicking" sound indicates correct installation.

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