Not all roofs are created equal, and this is especially true when comparing commercial flat roofs to the type of sloped or pitched roofs found in residential roofing. Flat roofs are the most common roofs found in industrial and commercial buildings. Even if you know everything there is to know about how a sloped residential roof works, a flat roof is fundamentally different and has completely different needs. Rather than asphalt shingles, flat roofs typically use either tar and gravel or protective membranes to prevent water and air infiltration.
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