The “bond Beam” is the rigid beam used to tie and stabilize the top of the tyre walls. It is the foundation upon which the roof is constructed.

The beams are mostly steel reinforced concrete, but can be made of timber, with locking bolts hammered deep into the tyres.

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Above: Concrete bond beams

Below: Wooden bond beams

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Wooden shuttering

 

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“Can wall” Shuttering

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