I did an inspection on a new build with asphalt dimensional shingles. I could see with my Drone that the overlap on the shingles was different in two different areas. It looked like to me an excessive amount of overlap that may affect the uplift protection of the shingle. I reported it as such and recommended further evaluation and correction. Did I overstate the situation?
Looks like an insufficient lap across the whole roof.
But I can’t tell from here, neither can your drone.
Did you measure the lap?
Those dark areas will get a lot hotter than the rest. Where are you at?
Heat kills roofs.
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It is a Home on pilings, I could not access safely. but the installer and the county inspector are stating that it is “fine” Lol! I believe the rest of the roof is installed correctly at least from my perspective. The rows that are standing out look like excessive overlap. So i reported it as a potential uplift issue.
What does the Manufacturers Installation Instructions require?
unsure of who manufactured the shingles. but from my research 5-5/8” is what most recommend.
Looks like it was done on purpose and they may have added additional sealant. Could you determine why it was done? Were they trying to match the shingle line on and adjacent roof?
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I agree.
They may have made the course adjustment all at one time.
Was it visible from the ground?
Lifting the tabs may have helped determine if sealant was used there.
Do you have a picture from further back showing the whole house side?
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Those dark rectangles are designed to be visible and not intended to be overlapped.
Overlap appears proper, until the row that is overlapped too much. That is not a defect that should affect the warranty, but it is a cosmetic “defect”, kinda like sloppy, runny paint. Ugly, but performing.
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I would rather see too much overlap vs too little overlap. Always try to consider the consequence of the observed condition.
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Here is what one manufacturer states about exposure.
Using the correct exposure is critical to obtain the optimum wind resistance of your shingles.
Most shingles are manufactured with a strip of adhesive that self-seals with sufficient heat
from the sun. Using the correct exposure ensures that this sealant strip is properly
positioned for maximum performance. The wind resistance rating of a shingle is dependent on proper nailing position and
exposure, so any deviations from the specification may invalidate the rating.
It’s a home on 10’ pilings can’t see unless you’re using a drone or from the roof itself. My concern at the time of the inspection was high wind resistance. And according to some manufacturers the exposure can affect the shingle rating.
Here is what one manufacturer states:
Using the correct exposure is critical to obtain the optimum wind resistance of your shingles.
Most shingles are manufactured with a strip of adhesive that self-seals with sufficient heat
from the sun. Using the correct exposure ensures that this sealant strip is properly
positioned for maximum performance. The wind resistance rating of a shingle is dependent on proper nailing position and
exposure, so any deviations from the specification may invalidate the rating.
[quote="Larry Kage, CMI, post:8, topic:243379, username:lkage”]
Do you have a picture from further back showing the whole house side?
[/quote]
[quote="LARRY THOMPSON, post:12, topic:243379, username:lthompson7”]
It’s a home on 10’ pilings can’t see unless you’re using a drone or from the roof itself.
[/quote]
So, no pictures further back, then?
None of which answer’s the question at hand… “What is the correct installation exposure”?
Remember, the dark area is a “faux shadow” and is intended to be exposed.
Again, the question being… how much does the manufacturer require for exposure to maintain the installation parameters as required?
In my research I’ve read 5-5/8", I don’t have a ladder that tall so I do not have access to the roof to walk it. The house is on 10’ pilings.
So basically, a two story home.
Yes, a 2 story home.
If there are many 2-story homes in your area (Florida I think, no?), an extension ladder may be beneficial for roof inspections.
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