What is the correct way to round when estimating composite shingle quantities?

The correct method for rounding when estimating composite shingle quantities involves rounding to the nearest third. This approach aligns with the industry standard for estimating material requirements, particularly due to the packaging and installation specifics of shingles.

Composite shingles are often sold by the bundle, and one bundle typically covers a certain amount of area, measured in square feet. When estimating the quantity needed for a roofing project, it’s crucial to account for both waste and the coverage provided by each bundle. Rounding to the nearest third allows for a more precise calculation of the number of bundles required, as it accommodates partial bundles that might be necessary to finish a roofing job without creating excess waste, which can lead to cost inefficiencies.

In contrast, rounding to the nearest whole number may lead to an underestimation of material needs, while rounding to the nearest quarter can still be inaccurate, as shingles are commonly sold in specific increments that do not correlate directly to quarters or whole numbers. Not rounding at all could result in complications during material ordering and procurement, making it essential to follow the established practice of rounding to the nearest third for accurate estimation.