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Welcome to our blog!
We want you to be an informed homebuyer, and each blog post is a question that we have answered for our friends and customers over the years. Hope they help you make a good choice for your next home.

And here’s another example at furnace flue. Notice the waviness at the ridge also.

The way to be sure you are looking at a double layer of shingles is to get up on a ladder (if you are comfortable doing that) and examine the shingles at the edge. A normal roof has a “starter” row of shingles and then a single layer above it, for a total of two layers of shingles. A roof-over will have four layers, like in the photo below.

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 do I clean up rodent (rat, mouse or squirrel) urine and droppings in attic insulation?

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

  4. How can I make my roof last longer?

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

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

  7. What is roof pitch?

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

  9. Should I buy a fixer-upper?

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

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

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

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

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

  15. What is a TPO roof?

  16. What is a “cool roof”?

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

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

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

  20. What is the average lifespan of a house?

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

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

  23. What is fiber reinforced concrete?

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

  25. What is a “continuous load path”?

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

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

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

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

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

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

  32. What is a “square” of roofing?

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

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

  35. Why is the attic painted silver?

  36. What is an SPF roof?