How to Glue Treated Lumber

Lead Image for How to Glue Treated Lumber
  • 1-2 hours
  • Beginner
  • 120-150
What You'll Need
Hair dryer
2-part epoxy adhesive
Medium-grit sandpaper
Fine-grit sandpaper
Work surface
Protective mask
Waterproof sealant for wood

Treated lumber is typically covered and injected with chemicals to preserve and protect the wood. Treated lumber prevents the elements from warping the wood as well as stopping mold and insects from destroying it. Many construction companies utilize treated lumber in new homes, decks, boat docks, and fences because the wood can last for 40 or more years. This treatment process is what makes treated lumber difficult to glue as the chemicals used add moisture to the wood, but it is possible and this article will show you how.

Step 1 - Choose the Epoxy

There are two kinds of epoxy: wet and dry. They do basically the same things and which you choose is up to you. If, however, you do not have the time or means to wait for the wood to dry then utilize the wet epoxy which means you simply have to make the wood wet prior to use.

Step 2 - Dry the Wood

Place it in a dry location. You can add a dehumidifier to the room as well. Only place treated lumber outside to dry during the hottest time of day and in direct sunlight. Use a hairdryer to blow hot air over the treated lumber going from end to end slowly. Place the board in the dry place and allow it to rest in there for at least 3 days.

Step 3 - Prepare the Wood for Glue

In order to get the glue to be effective, you need to sand the surface of the treated lumber where you plan on applying the glue. Wear gloves and a mask while working to protect yourself from the chemical-laden dust. Start with the medium-grit sandpaper and then switch to the fine-grit sandpaper. When you are finished be sure to remove the dust from sanding with a rag or tack cloth. The area should be smooth.

Step 4 - Gluing the Treated Lumber

Place the lumber on your work surface. Open the 2-part epoxy and mix both parts together according to the directions on the container. Remember to use gloves as well as mouth and face protection as epoxy can damage your skin, burn your eyes and hurt your lungs. Depending on the product you use you may be required to wet the boards. If you have to do this, apply water with a paper towel.

Once the epoxy is mixed spread it on both pieces of lumber, carefully press both pieces of wood together tightly and then clamp them. The epoxy needs time to cure and this can be as little as 4 hours for small pieces of wood but as long as 3 days for larger pieces. A safe practice is to allow the epoxy to cure for at least 4 days and in a dry area. You may have epoxy running out from the sides of the joined pieces which you can wipe off with a rag. If the treated lumber is going outside, seal the wood.