Dry Rot Repairs up on a Roof

How to stop dry rot up on a roof.

dutch rafter with dry rot Here is an example of a poorly installed dutch barge rafter that never had a chance to perform. As you can see the rafter lays right on the roof. This is not good because it allows moisture to soak up into the wood causing dry rot as you can clearly see in this picture. Most horizontal cuts like this should be 3/4 of an inch off the roof. This barge rafter was installed raw and never has seen paint on the underside because it rest on the roof shingles. When replacing this rafter I advise using a pre-primed 2×6, make the correct cut, prime and paint the wood prior to the installation. This gives the customer a good chance of having this dutch barge rafter perform for years and years without dry rotting.

dryrot siding The same goes for any wood touching the roof. This picture to the right is of a chimney chase with T-1-11 siding that has also dry rotted. Even being 3/4 of an inch off the roofing shingles the installer created a dam on the right corner at the 1×4 trim. This allowed moisture to wick up the trim boards and dry rot both the 1×4 trim and the siding. When replacing this I also advise pre-priming and painting all the cuts and the back side of the siding and trim up two feet from the roof. This is now protected and will stop any moisture from walking up the back side and causing dry rot. The trim board also must allow water to move freely down the roof and not cause any damming.
Painting wood before it is installed is big a hassle for the roofer but if you think about it, it needs to be painted anyway. Having the raw wood sealed with paint is just a better job. It is easier to paint on the ground than on a roof. There will be some touch work to be done but the time you save and removing the risk of spilling paint on your new roof or worse fall off the roof have been greatly reduced by pre-painting.
In short, Try to cut any wood 3/4 of an inch off the roof and maintain the wood with a normal paint job ever few years and you won’t see dry rot up on the roof.

If this was helpful like us on Facebook and share the good advise.

About author

Bob
Bob 270 posts

Since 2005 Bob has been answering questions, free of charge, here at AskARoofer.com. With a strong background in residential roofing and provides a practical and simple answers to hundreds of roof related questions, so it is easy to understand the issues you may have with your roof. Our answers are free so feel free to ask what you want. Use the green question box to contact myself or AskAroofer.com I have spent ten years as a union shingler, seventeen years as a California licensed roofing contractor with a general contractor endorsement and since Feb. of 2005 a roofing consultant. If I don't know the answer to your question, I will point you in the right direction.

You might also like

Installation Tips 2 Comments

What is a hook blade?

The hook blade is used for cutting and trimming asphalt shingles. It cuts better than a straight blade and fits in the same type of holder. These can be purchased

Business 7 Comments

5 Common Customer Issues Superior Roofers Don’t Deal With

The average homeowner is unable to tell the difference between any two roofing companies. That is why if you really want to stand out in the roofing industry, you have

Installation Tips 0 Comments

Roofing in California, are you ready?

Cool Roofs We in California are very familiar with title 24 regarding Cool Roofs. For the past few years, we understand our choices of roofing materials are limited to the

0 Comments

No Comments Yet!

You can be first to comment this post!

Leave a Reply