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How Long Do Composite Roofs Last in the PNW?
A composite roof typically lasts 20 to 50 years, depending on the quality of the shingles, installation, maintenance, attic ventilation, and local weather conditions. In the Pacific Northwest, rain, moss, algae, shade, and moisture can shorten a roof’s lifespan if it is not inspected and maintained regularly.
How Long Does a Composite Roof Last?
Most composite roofs last between 20 and 50 years. Higher-quality composite shingles may last longer when properly installed and consistently maintained. Composite roof lifespan depends on:
- Shingle quality
- Roofing manufacturer
- Installation workmanship
- Roof slope
- Attic ventilation
- Insulation
- Gutter condition
- Tree coverage
- Moss and algae growth
- Storm exposure
- Regular roof maintenance
If your composite roof is approaching 20 years old, it is a good idea to schedule regular roof inspections so a roofing professional can catch small issues before they become larger problems.
What Is a Composite Roof?
A composite roof is made from engineered roofing materials designed to provide durability, style, and weather resistance. Composite shingles can be made from materials such as asphalt, fiberglass, recycled plastics, polymers, or other synthetic blends.























