Why You Shouldn’t Install Asphalt Shingles Over a Cedar Shake Roof

Why Asphalt Shingles and Cedar Shake Roofs Don’t Mix

When it’s time to replace a cedar shake roof, some contractors may suggest installing asphalt shingles directly over the existing cedar decking. At Mattsson Roofing, we strongly advise against this practice, and here’s why.

The Problem with Cedar Shake Decking

Cedar shake roofs are made up of individual wood slabs that, while effective for a cedar system, lack the strength and stability needed for asphalt shingles. Let’s break down the issues:

  1. Lack of Structural Support: Cedar shake decking is flimsy compared to plywood. It cannot hold the weight or provide the stability required for asphalt shingles.
  2. Vulnerability to Wind Damage: Nails driven into cedar shake decking can easily pop out, making asphalt shingles more susceptible to being ripped off during heavy winds or storms.
  3. Poor Nail Retention: In a test we performed, nails driven into cedar shake decking pulled out easily. By contrast, nails driven into plywood decking remained firmly in place, even when force was applied.

The Right Way to Replace a Cedar Shake Roof

Replacing a cedar shake roof with asphalt shingles requires proper preparation:

  1. Remove the Cedar Shake: All existing cedar shakes must be removed to create a clean surface for new decking.
  2. Install New Plywood Decking: Plywood provides a sturdy and durable surface for nailing asphalt shingles, ensuring they stay secure and perform well over time.
  3. Install Asphalt Shingles: Once the plywood is in place, shingles can be properly installed to give your home a beautiful and long-lasting roof.

Why Cutting Corners Is a Bad Idea

Skipping the step of replacing cedar shake decking with plywood can lead to:

  • Frequent Repairs: Shingles installed on cedar shake are more likely to suffer from wind and storm damage.
  • Reduced Roof Lifespan: The instability of cedar shake decking can compromise the durability of your new asphalt roof.
  • Higher Costs Over Time: While it might seem like a cost-saving measure, skipping plywood installation often leads to expensive repairs or a full roof replacement sooner than expected.

Trust Mattsson Roofing for Your Roof Replacement

At Mattsson Roofing, we prioritize long-term solutions over quick fixes. Here’s why Bergen County homeowners trust us for their roofing needs:

  • Expert Craftsmanship: We follow best practices to ensure your roof is built to last.
  • Transparent Process: From removing cedar shakes to installing shingles, we keep you informed every step of the way.
  • Commitment to Quality: We use only high-quality materials to protect your home from the elements.

Ready for a Durable and Beautiful New Roof?

Don’t settle for shortcuts when replacing your cedar shake roof. Contact Mattsson Roofing at 201.925.9709 or visit www.MattssonRoofing.com to schedule a consultation and get the job done right.