For composite roofing, how many bundles are typically assumed per square?

In roof estimations, a square is a unit of measurement that covers an area of 100 square feet. When it comes to composite roofing, it is generally accepted that three bundles of shingles are needed to cover one square. This standard takes into consideration the overlap that occurs when the shingles are installed, the waste that is typically generated during installation, and the specific design and coverage area of the shingles themselves.

The assumption of three bundles allows for a more accurate estimation when calculating the total number of bundles needed for a roofing project. This figure helps contractors and estimators ensure they have enough materials on hand while minimizing over-purchasing and waste.