Cedar shake roofs are admired for their warm, rustic appearance and natural insulating qualities. Unlike synthetic or asphalt roofing materials, cedar is a living, breathing material. It’s organic and beautiful, but also more vulnerable to environmental wear. While cedar shake roofs can last 30 years or more with proper care, neglect can lead to premature failure and expensive repairs.
If your home has a cedar shake roof, regular maintenance is key to preserving its durability and visual appeal. In this guide, you’ll find essential and practical maintenance tips to help your cedar shake roof stand the test of time.
Why Cedar Shake Roofs Require Special Care
Cedar shake roofs are made from split logs, usually Western Red Cedar, which is valued for its natural resistance to decay, insects, and moisture. However, even the best cedar will eventually degrade when constantly exposed to rain, sun, snow, and debris.
Cedar is also hygroscopic, meaning it absorbs and releases moisture. This makes it prone to swelling, shrinking, and warping if not properly maintained. Unlike synthetic materials, cedar must be regularly checked and cared for to stay in good shape.
Without consistent maintenance, a cedar shake roof can deteriorate quickly, resulting in leaks, rot, and structural issues. The good news is that with the right attention, a cedar roof can retain its strength and beauty for decades.
1. Schedule Regular Roof Inspections
Frequency: At least once a year, and after major storms or high winds.
Having a professional inspect your roof regularly is one of the best ways to catch small issues before they become major problems. A trained roofing contractor will assess:
- Cracked, split, or missing shakes
- Loose fasteners or lifted shakes
- Rot, mold, or moss development
- Soft spots on the deck or underlayment
- Issues with flashing, chimneys, or skylights
Why it matters: Early detection of wear or damage helps you avoid costly repairs and extends the lifespan of your roof.
Pro tip: Keep a maintenance log. Note when inspections occur and what issues were found or fixed. This is especially helpful if you plan to sell your home.
2. Keep the Roof Free of Debris
What to remove: Leaves, pine needles, branches, and any organic material that accumulates on the roof or in valleys and gutters.
Why it matters: Organic debris holds moisture against the wood. Over time, this constant dampness promotes mold, mildew, rot, and moss, especially on shaded sections of the roof.
Best practices:
- Use a soft broom, roof rake, or air blower
- Avoid pressure washers, which can damage wood fibers
- Keep gutters and downspouts clear to promote drainage
3. Control Moss, Algae, and Fungal Growth
What to watch for: Green, black, or fuzzy growth on or between shakes, especially on the north side of the roof or in shaded areas.
Why it matters: Moss and algae trap moisture against the shakes, accelerating deterioration. In colder climates, trapped water can freeze and expand, worsening cracks and gaps.
Treatment options:
- Use cedar-safe, non-bleach-based moss and algae treatments
- Apply when weather is dry and no rain is expected for at least 24 hours
- Avoid DIY remedies like vinegar or bleach, which can stain the wood or harm nearby plants
Preventive step: Keep nearby trees trimmed to reduce shade and improve air circulation, helping the shakes dry more quickly after rain.
4. Maintain Proper Attic Ventilation
Why it matters: Moisture doesn’t only come from above. Without good airflow in your attic, heat and humidity can build up beneath the roof, contributing to wood rot, mold growth, and premature aging of the shakes.
What to check:
- Ensure soffit and ridge vents are not blocked
- Install or upgrade attic fans or passive vents if needed
- Look for signs of condensation inside the attic
Proper ventilation helps maintain a balance between indoor and outdoor temperatures and keeps humidity levels in check year-round.
5. Trim Overhanging Branches and Vegetation
What to trim: Any trees or shrubs that touch or overhang the roof.
Why it matters: Overhanging branches block sunlight and drop leaves, which lead to moss growth and moisture retention. They can also physically damage the roof during windstorms.
Tips:
- Keep branches at least 3 to 6 feet away from the roof
- Ensure nearby vegetation isn’t blocking airflow around the home
- Trim back vines or shrubs that may climb up walls and touch the roof edge
This simple step can dramatically improve your roof’s longevity.
6. Use Gentle Cleaning Techniques
Keeping your roof clean doesn’t mean being aggressive. Cedar is a natural material that can be easily damaged by harsh tools or chemicals.
Avoid:
- Power washing, which strips the wood’s natural surface layer
- Harsh detergents or bleach
- Wire brushes or abrasive tools
Instead:
- Use a soft-bristle brush and cedar-safe soap
- Rinse with low-pressure water if necessary
- Work in small sections and always start at the top of the roof to avoid forcing water under the shakes
7. Apply Protective Treatments Periodically
Cedar shake roofs can benefit from oil-based wood preservatives and treatments that shield against UV rays, moisture, and fungi.
Benefits of treatment:
- Restores moisture balance in the wood
- Slows down graying and weathering
- Adds years to the roof’s lifespan
When to apply:
- Every 5 to 7 years, depending on climate and exposure
- After thoroughly cleaning the roof and ensuring it’s completely dry
Note: Not all cedar roofs require treatment. Some homeowners prefer natural aging and patina. However, in wet or sunny regions, treatments can be especially valuable.
8. Replace Damaged or Missing Shakes Promptly
If shakes become cracked, loose, or fall off entirely, they expose the roof deck to the elements.
Why prompt action is important:
- Prevents water intrusion and mold growth
- Protects structural integrity
- Maintains roof performance and appearance
Even a few missing shakes can lead to significant damage if left unaddressed. A licensed roofing contractor can easily replace damaged shakes and inspect the surrounding area for hidden issues.
9. Monitor for Signs of Aging or Structural Issues
Over time, your roof will naturally age. But not all aging is harmless.
Watch for:
- Sagging areas or dips in the roofline
- Shakes that look dry, brittle, or paper-thin
- Discoloration from rot or mold
- Interior signs like ceiling stains, peeling paint, or musty odors
When these signs appear, it may be time to start planning for major repairs or eventual replacement.
Final Thoughts
Cedar shake roofs require more care than asphalt or synthetic options, but the tradeoff is unmatched character, natural performance, and charm. With proactive, seasonal maintenance and attention to key warning signs, you can enjoy your cedar shake roof for decades.
Cedar Shake Roof Maintenance Checklist:
Annual roof inspection
Clear debris from roof and gutters
Apply moss and algae treatment if needed
Trim overhanging branches
Ensure attic has proper ventilation
Clean gently (no pressure washing)
Apply wood preservative every few years
Replace damaged or missing shakes promptly
Taking care of your cedar roof isn’t just about extending its life. It’s about protecting your home from costly water damage and preserving the beauty that makes cedar shake roofing so special.
