Moss and Algae on Your Roof: What Coastal Homeowners Should Know

The Oregon Coast receives over 60 inches of rain annually, and our homes are regularly subjected to wind gusts exceeding 60 miles per hour during winter storms. Your roof is the first line of defense against all of it. Choosing the right roofing material and ensuring proper installation is one of the most important decisions a coastal homeowner can make.

Tad Oliphant Construction provides roofing services throughout Lincoln County, from tear-offs and full replacements to targeted repairs and maintenance. We work with all common roofing materials and can advise you on the best choice for your home's specific exposure and your budget.

Asphalt Shingles

Architectural (dimensional) asphalt shingles remain the most popular roofing choice in our area due to their balance of performance and affordability. High-wind rated shingles from manufacturers like CertainTeed, GAF, or Owens Corning are available with wind warranties of 110-130 mph, which covers even the worst storms we typically see.

The key to asphalt shingle longevity on the coast is proper ventilation and installation. We follow manufacturer specifications for starter strips, nailing patterns, and ridge cap installation. Shortcuts in any of these areas lead to premature failure, especially in high-wind conditions.

Metal Roofing

Standing seam metal roofing is an excellent choice for exposed coastal locations. It sheds water immediately, resists wind uplift when properly installed, and can last 50 or more years. It is also lighter than asphalt, which can be an advantage on older homes with aging structural framing.

The primary consideration with metal roofing on the coast is corrosion resistance. We recommend Galvalume or aluminum panels for any home within a few miles of the ocean. Standard galvanized steel will begin showing corrosion within a few years in direct salt spray exposure.

Moss and Algae

Moss growth on roofs is one of the most common issues we address. The combination of shade from surrounding trees, persistent moisture, and cool temperatures creates ideal conditions for moss. Left unchecked, moss lifts shingle edges, traps moisture, and accelerates deterioration.

We recommend zinc or copper ridge strips for long-term moss prevention. These metals release trace amounts of ions during rainfall that inhibit moss and algae growth on the roof surface below. Combined with regular debris removal, this can significantly extend the life of your roof.

When to Replace vs. Repair

As a general guideline, if more than 30 percent of your roof surface is showing signs of wear, replacement is usually more cost-effective than repeated repairs. We provide honest assessments and will always tell you if a repair can buy you more time before a full replacement is needed.

Get a Roof Assessment

We offer free roof inspections throughout Lincoln County. Call (541) 270-0274 to schedule a visit.