How to Repair Rotted Garage Door Bottom (Step-by-Step Guide)

how to repair rotted garage door bottom

Are you tired of dealing with a rotted garage door bottom that compromises the security and aesthetics of your garage? Don’t worry. We’ve got you covered! In this practical and realistic step-by-step guide, we will walk you through the process of how to repair a rotted garage door bottom.

By following our expert instructions, you’ll be equipped with the knowledge and skills to tackle this common issue and restore your garage door’s structural integrity. 

Say goodbye to the rot and hello to a sturdy and visually appealing garage door once again!

How to Repair Rotted Garage Door Bottom

A rotting garage door bottom can be a common problem, especially in areas with wet or humid climates. If you’re noticing that the bottom of your garage door is starting to rot, it’s important to repair it as soon as possible. A rotting bottom can allow water and pests to enter your garage, which can cause further damage and even structural problems.

Tools and Materials Needed to Repair the Bottom of Garage Door

  • Screwdriver
  • Saw
  • Hammer
  • Nails
  • Wood filler
  • Sandpaper
  • Primer
  • Paint

Now, let’s explore how to repair a rotted garage door bottom in this step-by-step guide.

Step 1: Assess the Damage

Assess the Damage

The first step in fixing the bottom of the garage door is to assess the extent of the damage. Carefully inspect the bottom portion of your garage door and identify areas that are affected by rot. Take note of whether the rot is confined to a small section or if it has spread across a larger area. This assessment will help you fix the appropriate repair method and the materials you’ll need.

Step 2: Remove the Rotted Wood

Once you have identified the rotted areas, it’s important to remove the damaged wood completely. Use a chisel, screwdriver, or a similar tool to carefully pry away the rotted wood. Take precautionary measures such as wearing safety goggles and gloves during this process to protect yourself from any potential injuries.

Step 3: Treat the Area

After removing the rotted wood, it’s crucial to treat the remaining surface to prevent further decay. Apply a wood preservative or rot-stabilizing solution according to the manufacturer’s instructions. This treatment will help protect the repaired area from future moisture damage and ensure the longevity of your garage door.

Step 4: Build a Replacement Piece

Build a Replacement Piece

Measure the dimensions of the removed section and cut a replacement piece from pressure-treated wood. It’s important to use pressure-treated wood as it is more resistant to moisture and rot. Ensure that the replacement piece matches the thickness and length of the original section to maintain the structural integrity of the garage door.

Step 5: Attach the Replacement Piece

Apply a generous amount of exterior-grade construction adhesive to the back of the replacement piece. Carefully position it in place, aligning it with the surrounding wood. Secure the replacement piece using screws or nails, ensuring a strong and durable bond. Take your time to ensure that the replacement piece fits snugly and seamlessly with the existing wood.

Step 6: Seal the Repair

To further protect the repaired area and prevent any future moisture infiltration, apply a layer of exterior wood filler or epoxy filler over the joint between the replacement piece and the existing wood. Smooth out the filler using a putty knife and let it dry based on the manufacturer’s instructions. Sealing the bottom of the garage door ensures a seamless and aesthetically pleasing finish.

Step 7: Sand and Finish

Sand and Finish

Once the filler has dried, use sandpaper to smooth out any rough edges and build a uniform surface. This step will also help blend the repaired section with the rest of the garage door. After sanding, consider applying a coat of exterior-grade paint or stain to match the color of your garage door. Not only will this provide added protection, but it will also increase the overall appearance of the repair.

Step 8: Replace Garage Door Bottom Seal (Optional)

While repairing the rotted garage door bottom, it’s an opportune time to consider the bottom of the garage door’s seal replacement for improved insulation and weatherproofing. Measure the length of the old seal and purchase a replacement of the same size. Remove the old seal by pulling it out of the retainer, then install the new seal by pushing it into the retainer until it’s securely in place. Replacing the bottom of the garage door with this new addition will further enhance the functionality and energy efficiency of your garage door.


  • If the rot is extensive, you may need to replace the entire bottom panel of the garage door.
  • Be sure to use weather-resistant wood filler and paint so that the repair will last.
  • If you’re not comfortable repairing the rot yourself, you can hire a professional to do it for you.


A malfunctioning garage door can be a major inconvenience and a potential safety hazard. At Pop’s Garage Door LLC, we understand the importance of a fully functional garage door, and we offer comprehensive repair services along with free consultation to address any issues you may be experiencing. We have the expertise to diagnose the issue and provide efficient and reliable repairs to get your garage door back in working order. Contact us today to resolve your problem.

Wrapping Up

Repairing a rotted garage door bottom may seem like a daunting task, but with the right guidance, it is a manageable project that anyone can undertake. By following these step-by-step instructions on how to repair a rotted garage door bottom, you can effectively address the issue of rot, restore your garage door’s structural stability, and enhance its overall appearance. Remember to prioritize safety, use the appropriate materials, and take preventative measures to avoid future damage. With a repaired and rejuvenated garage door, you can enjoy peace of mind knowing that your garage and its contents are well-protected.


Why is it important to repair a rotted wood garage door bottom?

Repairing a rotted wood garage door bottom is crucial for maintaining the structural integrity of the door. Rotten wood compromises the strength and stability of the door, potentially leading to further damage or even safety hazards.

What is the best way to seal a garage door?

The best way to seal a garage door is by installing a garage door weather seal along the bottom of the door.

How to fix the gap under the garage door?

To fix the gap under the garage door, you can install a garage door threshold seal or use a garage door bottom seal to close the gap and prevent drafts, pests, and debris from entering.

How to repair the rotted garage door bottom panel?

To repair a rotted garage door bottom panel, you can replace the damaged panel with a new one made of pressure-treated wood.

How to repair the rusted garage door bottom?

To repair a rusted garage door bottom, clean the affected area, apply a rust converter, and then paint or apply a rust-resistant coating to prevent further rusting.

How to repair the rotted garage door jamb?

To repair a rotted garage door jamb, remove the rotted wood, treat the remaining wood with a wood preservative or rot-stabilizing solution, and replace the damaged section with a new piece of pressure-treated wood.

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