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Wood trusses over pool

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Mr Banbury:  From what you have described you have a potentially dangerous condition.
Enclosed spaces above pools can develop 95 % humidity, which can cause dry-rotting of untreated wood.  The ceiling distress you describe is probably excessive deflection of the wooden support system.  I suggest that you shore the trusses and then carefully inspect the wood bottom chords for fungal decay (dry-rot).
Dick Phillips CE SE FSEAOC