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  1. 3)Then the pitch of the roof adds more area. A 6/12 pitch roof (6 inches of rise for every 12 inches of run) has approximately 117 square feet of roof over every 100 square feet of floor below. In this case, the pitch would tack on an additional 450 square feet. That makes a total of 32 squares of roof for an “1800 square foot” house.

    Because a square is the standard roofer’s measure, rolls of roofing felt are sized based on squares. A roll of 30-lb. roofing paper contains 216 square feet, which is 2 squares after allowing for lapping. Bundles of asphalt shingles are usually 1/3 of a square. These sizes simplify the contractor’s computations when ordering materials.

While we hope you find this series of articles about home inspection helpful, they should not be considered an alternative to an actual home inspection by a local inspector. Also, construction standards vary in different parts of the country and it is possible that important issues related to your area may not be covered here.
© McGarry and Madsen Inspection

More Blogs on Similar Subjects:

  1. Are roof trusses better than roof rafters (stick framing)?

  2. How can I be sure my roofing contractor got a permit?

  3. How can I make my roof last longer?

  4. What is the cost difference between asphalt shingle and metal roofing?

  5. What’s the difference between a roof inspection and a roofing estimate?

  6. What is roof pitch?

  7. What’s the difference between “composite” and regular wood siding?

  8. Should I buy a fixer-upper?

  9. What are “shiners” and why did they make me lose my insurance discount?

  10. What do you look for when you inspect a roof?

  11. Why does my insurance company want a roof letter?

  12. I saw some staining on the ceiling. Do you think the roof is okay?

  13. How do I find out the age of a roof?

  14. What is a TPO roof?

  15. What is a “cool roof”?

  16. What are the roof sheathing requirements for a roof replacement in Florida?

  17. Can metal roofing be used on a slow slope/pitch roof?

  18. How many layers of roofing are allowed on a home?

  19. What is the average lifespan of a house?

  20. What is the difference between galvanized and galvalume metal roofing?

  21. Does it cost more to roof a hip roof than a gable roof?

  22. What is fiber reinforced concrete?

  23. What is the difference between a clip, single wrap, and double wrap for the wind mitigation form?

  24. What is a “continuous load path”?

  25. Is a ridge board/beam required for a roof framed with rafters?

  26. What are the most common problems with wood roof trusses?

  27. What is the difference between roofing felt and synthetic underlayment?

  28. Why is a popped nail in a shingle roof a problem? How do I fix it?

  29. Why is it a mistake to replace a roof and not replace its flashings?

  30. What are the hazards to avoid when going into an attic?

  31. What are roofing purlins and battens?

  32. What is the life expectancy of an asbestos cement shingle roof?

  33. Why are most house roofs slanted instead of flat?

  34. How can I tell if a roof has more than one layer of shingles?

  35. What is an SPF roof?