For relentless PNW rain, choose algae-resistant asphalt shingles with SBS-modified asphalt, enhanced seal strips

https://hectorumwp775.capitaljays.com/posts/how-to-stop-moss-and-algae-on-seattle-roofs

For relentless PNW rain, choose algae-resistant asphalt shingles with SBS-modified asphalt, enhanced seal strips, and high wind ratings. Pair with waterproof underlayment and metal flashing to keep edges and valleys leak-free.