This is a good example of damaged composition roof
shingles, where someone installed them over a wood shingle roof, without
using any roofing paper. The roofing paper should have been installed
over the wood shingles and then the composition shingles would be
installed over the roofing paper.
This is another example of you get what you pay for. I doubt if a
professional roofer, who was licensed in your area, would have ever done
something like this.
There is a good chance that this roof doesn't leak. However, there could
be mold or fungus growing on top of the wood shingles and even inside
the attic. Usually extreme temperatures, will cause a roof like this to
deteriorate sooner than normal.
If you live in an area where snow accumulates on your roof, the moisture
could actually be seeping through the first layer of composition roofing
and absorbing into the wood shingles. Once this starts to happen, and
the wood shingles can't dry out properly. Your roof could soon start to
suffer from mold, fungus and dry rot.
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