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Every shingle roof needs an underlayment.  Because shingles are not adhered at all joints, wind driven rain can get beneath them.  Underlayment acts as a water shedding membrane in such case. For more intense issues, like shingle blow off, underlayment is necessary temporary protection for the time before repairs can be conducted. Underlayment is not designed to withstand the brunt of the weather by itself, but it is designed for those seldom (but inevitable) times …