If you've been watching moss accumulate on your roof, hop to it. The more it grows, the harder it will be to get off. Moss is especially common on the north side of roofs. First, come up with a plan ...

CORVALLIS, Ore. – In the moist Pacific Northwest, moss on roofs is inevitable. The ubiquitous plant clings to shingles, causing damage that can lead to expensive repairs and replacements. There’s ...