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Adding a green roof to the straw bale classroom

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The walls are up, and it’s time to add the green roof to our straw bale classroom at Castle Hill School.

First the beams go on

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Then we need to edge the roof

It will be a green roof – a living ‘lawn’ of sedum on top of the classroom, so a strong ‘fence’ around the edges is needed to prevent the ground from shifting when it rains. There is also a pathway of gravel around the lawn to provide structure and drainage:

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Adding the sedum

For a project of this scale, it’s easier to buy sedum and soil in rolls, like this:

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They can be easily unrolled onto the surface of the roof:

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Dan thought he was at the park and tried to take a nap...

Once complete, the roof looks like a field – it’s hard to tell it apart from the landscape behind!

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