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How to Look

at a House


A blog with answers
to your questions about
HOME INSPECTION
and HOME MAINTENANCE

Roof Dip Due to Warped Plywood At UnsupportedEdge


More blog posts about roofing:

  1. I’m buying a ‘50s house with a “gravel” roof. Is the roof going to be a problem.

  2. What are the right words for talking about a roof?

  3. Should I buy a house that needs a new roof?

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

  5. What is the minimum pitch of an asphalt shingle roof?

  6. What’s the difference between a gable roof and a hip roof?

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

  8. What is roof pitch?

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

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

  11. What is a “cool roof”?

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

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

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

  15. What is the difference between plywood and OSB?

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

  17. What is the minimum pitch for a metal roof?

  18. What does “lack of tab adhesion” in an asphalt shingle roof mean?

  19. What is an H-clip?

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

  21. If my roof is not leaking, why does it need to be replaced?

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

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

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

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

  26. What can I do to prevent roof leaks?

  27. Why is there no attic access hatch in the house?


More blog posts on related subjects:

  1. How can I tell if a house has insulation?

  2. What are the warning signs of a dangerous deck?

  3. Does it make sense to buy an older mobile home and remodel it?

  4. How do you determine when the house was built?

  5. Should I buy a fixer-upper?

  6. How do I remove cigarette odor in a house?

  7. The house has asbestos siding. What should I do?

  8. How do I get insurance if my home can’t pass a 4-point inspection?

  9. There’s an old fuel oil tank underground in the yard. Is it a problem?

  10. Why do the floors slope in this old house?

  11. The garage has been converted to a family room. Is that alright?

  12. When is a railing required for the edge of a deck or porch?

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

  14. What is a “continuous load path”?

  15. What are the different roof deck attachment discount categories for a wind mitigation inspection?

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

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

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

  19. What are roofing purlins and battens?

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.

  1. 2)Roof impact - When a heavy object such as a tree branch drops on the roof, it will cause a depression in the area and likely some structural damage to sheathing and roof trusses or rafters underneath. In the photo below, the impact depression is accompanied by a small hole.

  2. 3)Structural Defects - Undersize roof rafters or trusses that have had their center web members removed to make room for attic storage can cause a roof to sag along its span. Removal of the lateral bracing necessary for a roof rafters that are framed without a ridge beam will make the ridge dip noticeably, as in the photo below. To find out more about this defect, see our blog post “Is a ridge board/beam required for a roof framed with rafters?”

        Also, minor dips or lumps can occur at hip ridges or valleys due to poor roof truss alignment or other framing problems. They are typically barely noticeable and not a real problem. One of the advantages for builders of the heavier weight and thickness of dimensional/architectural roof shingles is that they can conceal minor imperfections in the roof deck.

If you want to reproduce this blog post, please contact us for permission, attribution and link requirements.
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.
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