Roofing materials are measured in squares, which is essentially 100 square feet of roof regardless of whether the 100 square feet is a 10’ X 10’, a 2’ X 50’, or a 4’ X 25’. The specific shape does not matter as much as pure measurements in order to correctly gauge how many bundles of shingles to buy.
Until the late 1970s, shingles were sold by weight. They are now marketed and sold by “year”, meaning how many year warranties they come with such as 20-year, 25-year, and 30-year.
Many household projects like cleaning up a garden and other yard work involve getting rid of a fair amount of dirt. But how should it be disposed of?
Most of us underestimate just how heavy dirt actually is. Depending on the amount of moisture in it, dirt can weigh anywhere from 76 to 110 pounds per cubic foot. Considering there are roughly 15 cubic feet of space in an average 96-gallon trash cart, filled with dirt, it could weigh at least 1140 pounds if the dirt is extremely dry. Any moisture at all and it could weigh over 1,600 pounds!
It is unbelievable how much trash Americans generate through the course of a week. Estimates are that “1,600 pounds is the amount of trash the average American produces annually. With the garbage produced in America alone, you could form a line of filled-up garbage trucks that would reach the moon”.
As astonishing as this number is, it’s just the tip of the iceberg since today’s fast-paced culture perpetuates the problem with readily available, pre-packaged everything! In fact, speaking of packaging, “72 million tons of containers and packaging in 2009 ended up in the U.S. municipal solid waste stream or MSW.
Roofing materials are measured in squares, which is essentially 100 square feet of roof regardless of whether the 100 square feet is a 10’ X 10’, a 2’ X 50’, or a 4’ X 25’. The specific shape does not matter as much as pure measurements in order to correctly gauge how many bundles of shingles to buy. 
