During my 30 years in the roofing business, I've installed many types of roofing and seen a number of products come and go. But one system that never goes out of style is the traditional built-up hot-mop roof. I learned how to do built-up roofing (BUR) during my early years in the trade, and my company continues to do it to this day.

It's not that we have anything against other types of roofing: We also install wood shingles, asphalt shingles, tile, and slate. But if a roof's pitch is shallower than 4 in 12, we're limited to using BUR or some kind of single-ply membrane, and my preference is the built-up roof.

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