Trimming the trees around your home to keep branches away from your roof is very important. With falling branches and nuts, your roof can lose many years. The falling debris can release the shake from your shingles. Black streakes on your roof is a sign that you have lost the protective coating from your shingles and should be looked at to determine if a new roof or replacement shingles. In order to keep the shakes on your shingles make sure your trees are trimmed back annually.