Cedar Shake Roof: Repair, Restore, or Replace? (2026)

Cedar shake roofs are one of the most beautiful things you can put over a San Juan Islands home, and one of the most misunderstood when they start to show their age. A little moss, a few curled shakes, and one leak after a November storm sends most homeowners straight to pricing a full tear-off. That’s often the wrong first move.

Many island cedar roofs can be restored for a fraction of full replacement. The deciding factors are the condition of the roof deck, whether the original fasteners are failing, and how much cedar is still sound. If roughly 70% or more of the shakes hold firm and the deck is dry, targeted repair usually wins.

Why cedar is so demanding in the San Juan Islands

Cedar is a natural product, and our climate works against it harder than almost anywhere. The islands see about 40 inches of rain a year, with the heaviest stretch in November, so cedar spends months at a time damp. On north-facing slopes shaded by Douglas fir, moss and algae move in and hold that moisture against the wood around the clock. West-side homes catch wind roughly 20% stronger than Anacortes, which lifts and loosens shakes over time. And near saltwater, salt air corrodes ordinary steel nails from the inside out.

That combination is why so many island cedar roofs fail at the fasteners before the wood itself gives up. The shakes may still look serviceable while the nails holding them have rusted to nothing. Understanding that distinction is the whole game when you’re deciding between cedar shake roofing repair and replacement.

Can my cedar roof be restored instead of replaced?

Restoration means keeping the cedar you have and bringing it back to weathertight condition: replacing individual failed shakes, redoing flashing at valleys and penetrations, gently cleaning off moss, treating the wood, and re-nailing loose courses with corrosion-resistant fasteners. When the bones are good, it can add many years of life for a small fraction of a new roof’s cost.

You’re a strong candidate for restoration or roof repair when:

• The skip sheathing or decking underneath is dry and solid, with no sag.
• Most of the cedar is still thick and firm rather than thin and brittle.
• Leaks are isolated to one or two spots, not spread across the roof.
• Moss is sitting on the surface, not rotting the shakes clear through.
• The roof is under about 25 years old with only localized failures.

When does a cedar shake roof need full replacement?

There’s a point where restoration is just money spent on a roof that’s leaving anyway. Lead with the deck: if the wood underneath is rotting or sagging, or the shakes have gone thin and split like cardboard across whole slopes, you’re past saving it.

Signs that point toward a full roof replacement:

• Widespread cupping, curling, and splitting on more than one slope.
• Classic “nail-popping” where rusted steel fasteners have let go everywhere.
• Multiple active leaks and interior ceiling staining.
• Rot or delamination in the roof deck itself.
• The roof is 30+ years old and failing uniformly, not in patches.

Cedar decision framework: restore or replace?

If your roof lands mostly in the left column, get it inspected before you price a tear-off. If it’s mostly in the right column, replacement is the honest answer.

What does cedar repair, restoration, and replacement cost?

Every number below is an island-adjusted estimate for education, not a quote. Island jobs cost more than mainland work because crews and materials stage onto the ferry, and old cedar hauls back off-island for disposal. A free inspection gives you your real number.

The gap is the whole point: restoring a sound cedar roof often costs less than a tenth of a new cedar shake roof replacement. Even if restoration only buys you five or eight more years, it can be the smarter play while you plan your next roof on your own timeline.

How to make island cedar last longer

If you love the cedar look and want to keep it, three things extend its life more than anything else in our climate:

1. Ventilation. Cedar has to dry from both sides. A properly ventilated roof assembly lets the underside breathe so shakes aren’t trapping moisture against the deck through our long wet season.
2. Copper or stainless fasteners. Near saltwater especially, ordinary steel nails are the first thing to fail. Corrosion-resistant fasteners keep the shakes anchored long after cheap nails would have let go in the west-side wind.
3. Moss control. Keep north slopes clear with gentle moss treatment and roof cleaning, then install zinc or copper ridge strips. Every rain washes a trace of metal down the slope that stops moss from regrowing. Never pressure-wash cedar; it destroys the wood.

Pair that with regular roof inspections and maintenance and you’ll catch a failing valley or a popped nail while it’s still a repair, not a replacement.

When it makes sense to switch to metal or shingle

Sometimes the honest advice is to stop fighting the cedar. If your roof is failing across every slope, the deck needs work, and you’re not eager to sign up for another 20 years of cedar maintenance, replacement is your chance to choose a lower-upkeep material.

• Standing-seam metal is the best long-term roof for the islands. With marine-grade Kynar 500 / PVDF coatings on 24-gauge steel and corrosion-resistant fasteners, our standing-seam metal roofing shrugs off salt air, sheds moss, and lasts 50+ years with almost no maintenance. It costs more up front than shingle but often less than a new cedar roof.
• Asphalt shingle is the budget-friendly path. A quality asphalt shingle roof won’t match cedar’s character or metal’s lifespan, but it’s a proven, affordable replacement that installs quickly between ferry runs.

Whichever way you lean, the decision should start with facts about your specific roof, not a guess from the ground.

Get an honest answer before you tear anything off

Whether you’re in Friday Harbor, Eastsound, Lopez Village, or out on Shaw, San Juan Roofing Co. will climb up, check your deck, fasteners, and cedar, and tell you straight whether your roof should be repaired, restored, or replaced. We’re a licensed, bonded, and insured WA contractor, our on-island inspections and written estimates are free, and we back our work with a workmanship warranty. Get in touch through our contact page or call (360) 205-1462 to schedule your free cedar roof inspection.