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

https://telegra.ph/How-to-Stop-Moss-and-Algae-on-Seattle-Roofs-How-to-Stop-Moss-and-Algae-on-Seattle-Roofs-06-02

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.