Is a huge plastic dome - with metal frame the plastic sheeting is stretched over the frame with special "petticoat" of white shadecloth. The plastic does wear and needs replacement every few years - so far our second hand ones have held but we look at the occasional tear or damage and wonder how long they will stand steadfast. In summer the roof of the hothouse is coated with special white paint, which creates a somewhat eerie atmosphere, but helps protect the plants from the hot overhead sun, and at the same time seems to encourage them the stems to grow taller. We have a door at one end, and big ceiling fans to circulate the air are suspended from the roof.
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