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How to Look

at a House


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


More blog posts about roofing:

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

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

  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 causes a lump or dip in the roof?

  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?


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

  17. What are the warning signs of a sinkhole?

  18. What is engineered wood siding?

  19. Should I be suspicious about a concrete block house covered with siding?

  20. What are the common causes of ceiling stains in a house?

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

  22. What causes a sagging roof ridge line?

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.

   Here’s a list of our top 5 most common truss defects found during a home inspection:

  1. 1)Cut or removed web members - Once the trusses are installed, the web members in the center of the truss cannot be cut or removed. Each one is designed to be alternately in tension or compression, while transferring loads placed on the roof through a continuous path between them and the top and bottom chords to the bearing points at the end of the truss. Any cut or removed piece interrupts the elegantly designed load path and compromises the strength of the truss.
        We regularly get asked by homeowners how much of the center of a truss can be removed so they can create a clear area in their attic for more storage. The answer, unfortunately, is none. Web members that have been removed after the home was built are our #1 most common truss defect in a home inspection. Sometimes a contractor installing an air handler or water heater in the attic will want to cut out a couple of web members to install the equipment. Don’t let them convince you that just removing one or two web members is alright. It’s not.
        And, because a truss is an engineered product, once a web member has been cut away or otherwise damaged, a  licensed, professional engineer has to specify the repair. Scabbing on a couple of pieces of lumber is not acceptable.
  2. 2)Unrepaired or poorly repaired damage from a roof impact or leakage - If the top chord has fractured or has a rotted section from leakage, even a small must be repaired. Sometimes the damage appears to be due to rough handling during installation.

  3. 3)Defective lumber - Sometimes a knot or check in the lumber of a truss is intact and appears structurally sound when the roof is installed, but pops open later. Resin dripping from the wood, as in the photo below, is ugly but not a structural defect.

  4. 4)Damaged or missing gusset plate - It must be intact and free of corrosion.

  5. 5)Not enough nails at the anchor strap or clip - A minimum of three nails is required at each side of the connector from the wall to truss.


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.
©2015 - McGarry and Madsen Inspection.

 

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