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MASONRY

Question: I have a customer that wants me to paint be outside of their brick chimney. They say it leaks and gets wet in the attic when it's raining, and that it just looks old and they don't like it anymore. Is it okay to do this for them?

Question: why do masonry chimneys have to meet the 3 - 2 - 10 rule?

Question: For the depth of a masonry fireplace, where does the hearth or firebox end, and the hearth extension begin, and how or where do I measure them?