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Major Safety Hazards
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This is simply damage, so great, that if left unattended it would become a safety hazard. A piece of timber so rotten and eaten away that no longer can support its own weight could be this. A pergola on the verge of collapse is another. A piece of barge board about to fall off the roof is another again. A floor eaten away is one and so is a frame that no longer holds its roof. There are many.