Snohomish, Washington and the Surrounding Area
Here in the Pacific Northwest, nearly every neighborhood contains at least one home with composite roofing. Some composite roofs are subject to shingle curling.
Curling or “fishmouthing” is something that can occur with asphalt and less often with a composition asphalt/fiberglass shingle. If this is a condition of the roof you are replacing, you may want to consider substituting a more durable material.