How Do I Know When I Need to Repair or Replace My Cedar Shake Roof?

Is your cedar shake roof starting to look worn, mossy, or uneven, and you’re not sure if it needs a simple repair or a full replacement? Are you worried about pouring thousands of dollars into maintenance, only to find out you should have replaced it instead?

You’re not alone. Cedar shake roofs are beautiful, but they’re also expensive and high-maintenance. Minor problems on your wood shake roof can be resolved with a repair, but if you have leaks or damage all over, then it’s probably time for a replacement.

We at RoofSmart have been called out to perform maintenance on houses all over the Greater Seattle area. We’ve seen all kinds of damage and have helped guide our customers through the process of deciding if a repair or replacement is best.

In this article, we’ll walk through the most common cedar shake roof problems we see across the Greater Seattle area, and give clear guidelines to help you decide when a repair makes sense or when replacement is the smarter long-term investment.

What are the most common problems we see with shake roofs?

Cedar shake roofs are pretty expensive to install and maintain, so not a lot of people choose to install this type of roofing material. They can last around 50 years, but that doesn’t mean they won’t have any problems before that.

Here are the most common problems that we see on cedar shake roofs in the Seattle area:

• Rot & Leaks:
• Debris in keyways (gaps between shakes), like moss, leaves, and pine needles, acts as a sponge. They soak up water on the roof and keep the wood around them wet. If the shake pieces don’t dry out properly, they can start to rot.

This is a fairly old roof that has a lot of moss growing in the keyways all over the roof. This is contributing to the rot and overall deterioration of the roof.

• Pressure washing thins out shakes. Each time you pressure wash them, you take a small layer off the top, thinning them out and creating small holes visible in the attic. This will definitely lead to leaks. Pressure washing can also take off chunks of the shake or even cause it to split.

Here’s an example of a hole in a cedar shake roof:

Holes in the roof can also be caused by falling branches.

• Common Failure Areas:
• Hip and Ridge Caps: These often fail first. They are made of two pieces of wood stapled together. As a result, there is a small gap. Your roofer is supposed to alternate the position of each gap so that it doesn’t run down the hip or ridge in a straight line. This helps to prevent water from flowing through the gap and causing a leak.

As you can see in this picture, some of the gaps line up, while others do not. These have been almost certainly replaced because they look a little bit newer than the rest of the roof, and they usually don’t last as long as the shakes used on the actual roof.

• Pipe Flashings: Poor quality or poorly installed pipe flashings can lead to leaks in your shake roof. This is a problem that can happen on any roof.

This pipe flashing is crooked and falling off, indicating that there was some sort of issue. It’s also old and rusty, which can indicate that it’s leaking.

• Splitting and Breaking Shakes: As the cedar shake gets old, it will start to split and break. In this image, you can see several spots where a small piece of the shake fell out because it split off:

• Improper Installation:

  • No Cedar Breather: Cedar breather is a mesh mat that you’re supposed to put underneath the shakes so that they have the chance to breathe. Without it, the shake sits directly on plywood, preventing proper airflow and drying capabilities.

• Low-Quality Wood: The type of wood you use for your shake roof is very important because it dictates the quality of your roof. Cedar is the best material to use, but even within that, there are multiple levels that you can get. Premium-grade cedar is the best you can get because it won’t twist or warp after it’s cut down. Anything less than premium runs the risk of twisting.

• Lower-grade or Young-Growth Cedar: These kinds of cedar have a lot of knots and twisted grain, leading to a high failure rate. Young-growth cedar has a wide grain that twists and fails quickly.
• Southern Yellow Pine: This is a cheap substitute for cedar. The price seems really great, but it doesn’t work very well. It will be completely dead in about 10 years, and you’ll have to replace your roof again.

How do you know when it’s better to repair or replace your cedar shake roof?

If your wood shake roof is starting to get old, it can be difficult to decide if it’s better to repair it or just replace the whole thing. Eventually, all roofs must be replaced, but sometimes you can get away with repairing your shake roof if you only have a few specific problem areas.

It can be hard to tell if your shake roof is even having problems because a lot of the time, they look fine from far away. It’s only when you get up close that you notice problems like holes, moss, or debris build-up, and rot.

Here are some guidelines for helping you decide if a repair or replacement is better for your shake roof:

• Do a repair if:
  • The repair will add 10+ years of life to the roof
    • Example: Often a temporary fix (e.g., sliding a tin sheet under a broken shake to divert water). This can also include cleaning off debris or replacing shakes that are broken or missing. These solutions only work if the rest of your roof is still in decent condition.
      
  • You can’t afford to do a full repair

• Replace the roof if:
  • The roof has widespread failure
    • Example: It’s covered in moss, rotting all over, or it has multiple leaks. A full replacement is the only long-term solution for a shake roof that is failing all over.
  • A repair isn’t going to help (there are too many problems for a simple repair to fix)

Repairs can help you extend the life of your roof, but they can only do so much for a roof that is old or just has too many problems all over the place. If you’re not sure which option is best for you, your roofer can help you decide.

Can I prevent these common issues on my cedar shake roof?

When you have a cedar shake roof, you have to spend a few thousand dollars on maintenance about every 5 years to keep it in good condition. This helps to keep the roof in good condition for as long as possible.

However, once the roof gets old, it’s going to look worn out and start to grow algae and moss. It’s inevitable, no matter how much money you spend. The simple truth is that cedar shake roofs are really expensive.

For example, we got called out to do some repairs on a 30-year-old cedar shake roof. This homeowner spent $6k–$8k on professional maintenance every 5 years, and this is what his roof looked like:

It’s not horrible, but it definitely looks old. Even though this homeowner has done a good job of keeping up with proper maintenance, his roof is still aging. By this point, he’s probably spent about as much for maintenance as he would to install a new shake roof.

How much does it cost to replace a cedar shake roof in Seattle?

By now, you’ve seen that cedar shake roofs can be repaired in certain situations, especially when problems are isolated and the structure is still sound. But when rot, moss, splitting, and widespread failure start showing up across the roof, repairs become temporary band-aids instead of real solutions.

Cedar shake roofs are beautiful, but they’re also one of the most expensive roofing systems to maintain and replace. And if you’ve already invested thousands into upkeep over the years, it’s natural to wonder whether putting more money into repairs makes financial sense.

If replacement is on the horizon, your next question is probably about cost and what to expect in the Seattle market.

Read our article “How Much Does a Roof Cost in 2026? Prices for Seattle Homeowners” to help you understand pricing factors, material differences, and what drives the total investment so you can make a confident, informed decision about your next step.