Go to How Not to Build an Addition Index! This page includes notes on calculating the number of bundles necessary for a job.


The quantity of materials needed for a job will be based on the surface area of the roof that is to be covered. There is a simple formula for figuring this out:

Length X Width = Area

Make sure you measure actual surface areas and not just the perimeter of your roof. When estimating, factor in cutting, slop, ridge lines, and extra for a dog house.

Three bundles of shingles make a "square". A square theoretically covers 100 square feet. I have found this rule of thumb to be accurate if you don't make too many mistakes with the utility knife.

Next Page

Tools and Materials
Shingle Transport
Felt Paper and Tar
How Many Shingles
Shingle Surfing
Laying Shingles

How You Really Shingle a Roof!

See below to order the book!

Introduction | Decision Making | Design | Permits | Buying Materials | Demolition | Digging | Masonry | Framing | Electricity | Plumbing | Inspections | Roofing | Sheathing / Siding | Soffits | Insurance | Insulation | Fat Fireman Rule | Drywall | Finish Carpentry | Tile | Painting | Carpet | Done

About the Author:
W.J. Rayment built an addition on his house, and in the course of the project learned from his many mistakes. This on-line compendium is his effort to help you learn from his experience. The advice and stories are often humorous, sometimes silly, but always informative. for yourself or as a gift for family or friends.

Contact Us | Privacy Statement