Laminated timber has an inherent resistance to fire and humidity

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laminated timber is used for primary frame because of its high spanning and load bearing qualities 

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Polycarbonate is durable and less expensive than glass and allows adequate light into my building from all directions to support the plant life

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Also my building is relatively open and naturally ventilated, as plants don't do well in environments that are too hot.

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Fir rafters don't need treatment because of low water content

Almost any length is possible with finger joining

Fir is used for most building details because it can be used both on the inside and outside of the building without being treated hence cutting costs

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A gutter drip is required because of the roofs gentle slope

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The sill of the window is located on the inside because that region of the building boarders the woods and a sill could house unwanted wild life

I used raft foundation because the lower ground level helps secure the building in place