The weight of a bundle of shingles depends on the weight of the shingles themselves, but for asphalt shingles is generally between 60 and 80 pounds. A bundle of shingles is packaged to be light enough to carry.
Shingles are sold both by the bundle and according to how many are needed to cover a square, which in roofing terms is the number of shingles needed to cover 100 square feet. The average bundle of asphalt shingles generally covers 1/3 of a square, but since bundles are meant to be light enough to carry, more bundles of heavier shingles may by necessary to cover a square. The quality of shingles varies depending on their weight. Premium asphalt shingles last the longest, and can weigh up to 430 pounds per square, while standard shingles weigh about 230 pounds per square. Cedar shingles weigh 160 to 320 pounds per square when dry, and are wrapped in four bundles per square, weighing between 40 and 80 pounds per bundle. Asphalt shingles can last 15 to 40 years, depending on their weight and the climate in which they are installed, while cedar shingles last 40 to 50 years, depending on their grade, and with proper maintenance can last over 100 years.