Here is one of the photos of an inspection I did 2 days ago. As you can see this roof has a problem. It also has 3 layers of shingles. As if the snow in Ohio wasn't heavy enough, this homeowner decided he'd add the weight of several layers of asphalt shingles.
The problem here is an old house, an old roof and too many shingles. Why is the number of roofing layers limited. When a roof system is designed there is a weight limit that the roof can safely carry. If your truck is a half ton, you don't load 3 tons of uh........ lead on it and hope for the best (prayer might be appropriate). The same goes for a roof, shingles are heavy. Add to the normal weight plus 6" of snow and the trusses holding the roof up begin to bow.
Although, this damage was caused by our recent storm it also exposed some damage that wasn't at all the storms fault.
Jack Gilleland
Clayton, Ohio
Other Blogs in this series
1) The Reason Things Are Done This Way
2) The Reason Things Are Done This Way II
3) The Reason Things Are Done This Way III
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