Approaches for creating a greenhouse

1. Big sheet of polytunnel plastic

  • Use UV stabilised plastic for durability.
  • Start in the middle and staple it onto the sticks.
  • If applying in cool / cold weather leave a little slack as it will tighten when it heats up.
  • At a few points you'll end up with excess which you can fold under. You could cut this off but it will introduce a hole which using a complete sheet avoids.
  • Continue this process across the dome.

This was done a bit like this:

Thanks to Tonno Olonen in Estonia.

2. Triangles of polytunnel plastic

  • The triangles of plastic can be stapled to each triangle in turn.
  • If applying in cool / cold weather leave a little slack as it they will tighten when they heat up.
  • Cut disks or pentagon / hexagons that will cover the hubs and can be stapled to the surrounding sticks.
  • Once these and the triangles are in place you can place a batten or thin wooden / metal strip on top of each strut and screw it down to the dome frame.
  • This secures the plastic more properly and covers over the joins too – so you end up with strut-polytunnel-strut sandwich with struts still visible from the outside.

This was done a bit like this:

Thanks to David Bruce in Ireland.

3. Triangles of rigid polycarbonate

  • Thin wall polycarbonate roofing panels (say 10mm thick).
  • These would be cut down into the triangles to fit the dome.
  • Each one fixed to the dome with glazing tape and a bead of silicone sealant to allow for expansion / contraction due to changes in temperature .

Some more greenhouse examples

An extra layer and a raised entrance, thanks to Graham Read, UK.

A zip entrance, thanks to Yasemin Kirkagaclioglu in Istanbul.

A raised bed inside the dome.

Smaller raised bed and a place to relax too.

A door approach.