How to Repair Rotted Wood in 6 Steps

Rotted wood is a common issue in homes, especially in areas exposed to moisture, such as windowsills and door frames. If left untreated, wood rot can spread to other wood and even other materials in your home, potentially compromising the structural integrity and appearance and leading to costly repairs. If you're up to the task, savvy DIY homeowners can learn how to repair rotted wood and save some money rather than hiring a professional.

Mistakes to Avoid When Repairing Rotted Wood

Repairing minor wood rot is a simple task that most DIYers should be able to tackle without too much of an issue. However, there are some important things to keep in mind and mistakes to avoid while you assess and fix the damage.

• Failing to identify the type of wood rot. There are a few different types of wood rot, and you should always take some time to try to identify which type you’re dealing with before you begin repairs. Dry rot sets into moist wood but can continue spreading through dry wood, so you need to take more extensive steps to prevent dry rot from spreading. Wet rot will only persist in moist wood, so treating the underlying moisture issue is crucial.

• Not treating the underlying issue before you start. Wood rot repair should always begin with an assessment of what caused the damage in the first place. Check for and correct roof leaks, clogged gutters, plumbing leaks, and water intrusion before repairing wood rot. Otherwise, your issue will only return.

• Attempting to repair rot on structural components. If you know how to repair rotted wood, you can tackle the job on decorative pieces, like exterior trim and fascia. If you ever notice rot on structural components, like main beams, floor joists, or rafters, contact a pro immediately. Failing to address the problem in its totality can lead to expensive and dangerous structural damage over time, so that’s a job you’ll want to leave to an expert.

• Neglecting to have a pro repair extensive damage. Even if the damage is on decorative wood, hiring a local handyman service or water damage specialist is best if the damage goes beyond the surface. If you start removing the rotted material and find that wood putty won’t do the trick to repair it, call a professional who fixes wood rot to replace the wood in its entirety.

DIY vs. Hiring a Pro

Repairing rotted wood is a manageable DIY project if you have basic carpentry skills and time to dedicate to the task. DIY repairs are suitable for small-scale damage or non-structural areas like window frames or trim. However, you should thoroughly remove all rot and use proper materials, as incomplete repairs could lead to recurring issues.

For extensive damage or structural components such as beams or load-bearing posts, hiring a water damage restoration professional is the better choice. Professionals bring expertise and can complete the job more quickly and efficiently. They can also ensure that repairs meet safety standards and are built to last. Expect to pay at least $500 on the cost of professional dry rot repair, though the average is $1,400. While the up-front cost of water damage restoration is higher when hiring a professional, it can save time, prevent mistakes, and avoid the need for future repairs.

Sometimes, mold is the cause of rotted wood or could escalate to a mold issue if it's not repaired. If you do have a mold issue, hire a professional. The average mold remediation cost ranges between $1,200 and $3,700.

Common Signs of Household Water Damage

It’s important to catch water damage early. The most common signs that indicate you have a moisture problem are rotting, buckling, or peeling surfaces, which show up in 31% of cases. Damp or wet areas are also common indicators at 26.5%.