However, this being the beautiful PNW some of us have quite a bit of tree overhangs resulting in pollen, needles, leaves, etc collecting on our roofs. If you start to see moss or algae growth go ahead and treat and sweep the roof. You can get Moss-B-Gone or many other similar zinc oxide-based treatments at almost any hardware store. It is always a good idea to ask your roofing company whether their estimates are free when you are scheduling your initial appointment. A couple factors go into calculating the cost per square foot of roofing.

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