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The Branch opinion is that since the Ontario Building Code is not retroactive, the existing structure need not be upgraded to meet the current design standards unless the structure is deemed to be unsafe.
In situations where roofs have withstood their 100 year snow load without signs of distress, where ground snow load values have increased due to climatic changes and/or better data or when standards have changed due to research or past experience, the Code has not required that those roofs be upgraded unless the change has been so drastic as to create a potential unsafe condition or where obvious signs of distress have necessitated remedial work.
June, 1995
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