What is a roof square and how is it related to the dimensions of built-up roof (BUR) felt roll?

What will be an ideal response?


A roof square = 100 sq ft of roof area. A BUR felt roll (3 ft × 36 ft) measures 108 sq ft. When the felts are laid, they are lapped 2 in. along the roll's length and 6 in. on its side so that a felt roll covers a roof area of 2 ft-10 in. × 35 ft-6 in. = 100.5 sq ft, or 100 sq ft. In other words, a BUR felt roll dimensions are based on the fact that it covers one roof
square.

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