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Joints and chords


Rotted box beam top chords and a breakdown of the urea formaldehyde adhesive coupled with ponding on the roof above were blamed for the 1974 collapse of a 10m span timber swimming pool roof in Ilford. (NCE 10 October 1974).

No-one was hurt when one third of the roof fell overnight, followed by a second third the next day.

Investigations y the Building Research Establishment suggested that failure occurred either at scarf joints in the bottom chord or at the joint between the bottom chord and a web.

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