These types of situations don't actually need to happen. In most instances, these blow-offs are as a result of a workmanship issue. Some of the most common reasons are as follows:
1) The shingles are nailed improperly. The nails are placed too high on the shingle. Instead of nailing into 2 shingles with 1 nail, by nailing too high, only 1 shingle is fastened.
2) The shingles do not have enough nails in them. A minimum of 4 nails is required. Shingles on the (rake) edges and/or on very steep roof slopes should have 6 nails per shingle.
3) Many older roofs do not incorporate a "starter" course of shingles along the rakes and eaves. The starter provides more protection against high winds as well as prevents the shingles from sagging.
Repairing this roof problem is relatively easy. The damaged shingles are removed. The felt paper is evaluated. If it is sound, it is re-used. Otherwise, it is removed too. The repair is finished by installing a starter course of shingle(s) and new shingles on the roof deck as well.
We are coming into a season where we will be seeing higher winds. Inspect your roof safely from the ground after we experience those windy days.
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