For steep-slope residential roofing in the Seattle area, the two most commonly compared systems are architectural asphalt shingles and metal panels. Neither is universally better; they trade off differently on cost, service life and detailing.
The Case for Asphalt Shingles
Asphalt shingles offer broad design availability, familiar installation and repair methods, and lower installed cost. On shaded Northwest roofs, moss management with material-compatible methods becomes part of ownership.
The Case for Metal
Metal roofing — particularly standing seam with concealed fasteners — offers long-term serviceability and clean lines, at higher installed cost. Panel type, gauge, coating and flashing design vary widely, so “metal” must be compared as a specific system.
Comparing Real Costs
Compare complete scopes: tear-off, decking terms, underlayment, flashing, ventilation and warranty — not just material names. The roofing cost guide explains why square-foot prices mislead on complex roofs.