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Asphalt shingles should never be adhered to the roof sheathing. Firstly, they have a limited service life, and must be replaced fairly regularly. Secondly, rigidly adhering them to the a dissimilar substrate will cause failure due to differing rates of expansion and contraction from the large temperature changes that a roof has to endure. This is also why trying to use patching cement to flash in around roof penetrations doesn't work either. Everything has to be able to move a little bit
I'm a roofer/carpenter btw, and most homeowners know absolutely nothing about how their home works.
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