The roof design for the building was conceived after reading numerous blogs and books on straw bale building and green roofing.

The design of the trusses came from a book – Building Green (link) and were developed from there. Here is a sketch up of the truss (link) if you want to see it in a 3D viewer program.

Once the roof structure was in place, I laid structural plywood, with a pond liner on top, sandwiched between carpets to protect it.

The plywood has carpet on it before the membrane to ensure no splinters get to it.

With all of that completed, I then had to plan my greenery for the roof. With the complications of the straw bale building, I wanted to make the roof as light as possible without making it bare, so I decided to go for a style of decking and rectangular plots containing different varieties of plants. I should take some completed photos, but here’s one of it in progress, the plants growing are literally weeds that have just sprouted up over the spring.