How to Calculate Shingle Replacement


Shingles are found on all types of houses and come with various warranties depending on the type and manufacturer. No matter what type of warranty your shingles have, there will come a time when they need to be replaced. Before replacing shingles, it is necessary to calculate how much will be needed. While it may seem like a daunting task, calculating shingle replacement is a job that can be completed by any homeowner with just a few useful tools.

Things You'll Need

  • Ladder
  • Tape measure
  • Pencil
  • Paper
  • Calculator
  • Measure the length and width of each side of the roof. Climb up to the roof and run a tape measure from side to side for the width measurement. Measure from the base of the roof to the peak for the measurement of the height. Multiply the two measurements together. Record the number for the total square footage of the first side of the roof.

  • Run a tape measure across the other side of the roof for both the length and width. Multiply the two measurements together for the square footage. Add up both sides of the roof to get the square footage.

  • Divide the square footage of the roof by 33. This is the number of square feet of shingles per bundle. If the square footage of the roof is 1500, then the amount of shingles needed would be 45.45 or 46.

  • Add five percent for waste factor. Shingles will be cut during installation and there will be waste. Add 10 percent for complex roofs with numerous curves and sides.

Tips & Warnings

  • Three bundles of shingles equals 100 square feet. One bundle is the same as approximately 33 square feet.

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