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

https://messiahrvxo831.theburnward.com/how-winter-ice-dams-leak-into-seattle-homes

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.