Step-by-Step
Polytunnel Installation Guide
Watch, read, or download our easy-to-follow instructions for assembling your polytunnel greenhouse.
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Installation Video Guide
Follow along with our detailed video tutorial
Written Installation Instructions
Step-by-step text guide for greenhouse assembly
1
Prepare the Foundation
Map out your greenhouse location and prepare the foundation.
- Mark the four corners with stakes or spray paint
- Use the 3-4-5 triangle method to ensure perfect right angles
- Draw a level building line about 10 cm off the ground
- Mark where your arches will go (typically spaced 1.32 to 1.5 meters apart)
- Drill holes for embedment posts: 30 cm wide and 40 cm deep (go deeper for commercial setups)
- Mix and pour concrete into the holes, holding posts steady
- Let concrete dry overnight
2
Assemble Frame Structure
Build the main frame structure once foundation is set.
- Assemble arches by connecting them to the columns
- Use self-drilling (tek) screws to attach pieces together
- Slot columns into embedment posts
- Add purlins and trusses for support between arches
- Secure purlin poles together with tek screws
- Secure purlins to inner arches using spring clips
- Attach ends of purlin poles to front and back arch using clamps
3
Install End Walls and Door Frame
Complete the end walls and door installation.
- Install horizontal bars on front and back arches using clamps
- Attach purlins between horizontal bar and arch to form a W
- Dig holes for embedment posts along end walls
- Install bar above and below door
- Install door track using taping screws
- Run ground-to-ground channels for front/back walls
- Make cuts in channel to bend around column elbows
- Secure with screws every 40-50 cm to keep frame rigid
4
Install Locking Profiles and Window Frames
Add finishing structural elements.
- Install locking profiles on front and back walls
- Use connector plates to keep channels straight
- For side walls, add two horizontal channels (20-30 cm off ground and 1 meter above)
- Install reinforced channels (if using), then standard locking profile
- Complete door frame and add horizontal profiles
5
Install Doors and Pest Control
Set up doors and pest prevention.
- Install sliding doors on rail system
- Attach door to trolleys with bolts and test movement
- Cover door frame with plastic or ventilation mesh
- Install polyethylene insect mesh on window frames
- Use wiggle wire to lock netting into channels
- Install dado film under insect mesh
6
Apply Covering
Install the greenhouse plastic cover.
- Unroll plastic sheet along side of greenhouse (shiny side out)
- Attach rope to film and pull over frame evenly
- Use dull object to deal with plastic snags
- Secure with wiggle wire from top to bottom
- Leave 20-30 cm of plastic overlapping ground
- Adjust tension to smooth out wrinkles
- Wait 20 days for concrete to fully cure before adding heavy loads
Prefer a Printable Guide?
Download our comprehensive PDF installation manual for offline reference during assembly.
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