The simplest method to keep your pressure-treated wood underground is to use an all-weather wood sealer on it. This, which you may apply with a pump garden sprayer, will give you one coat. Allow about two hours for the initial layer to dry and sink into the grain of the wood.

You Need to Seal The Wood

  • Allow enough time for the wood to fully dry before applying stains or finish.
  • Applying the Sealer

Allow enough time for the wood to fully dry before applying stains or finish.

Make sure you have a good quality all-weather wood sealer. You don’t want your investment to rot away because you didn’t protect it properly!

Related: How Long Does Pressure-Treated Wood Take to Dry? (A WHILE)

Applying the Sealer

Use a pump garden sprayer to apply the sealer. It’s important to get an even coat so that water doesn’t seep in and cause the wood to rot.

You only need one coat, but you may want to apply a second coat for extra protection.

Allow the first coat to dry completely before applying the second coat. This usually takes about two hours.

Sealing pressure-treated wood is a simple process that will extend the life of your investment.

By taking the time to do it properly, you’ll be able to enjoy your pressure-treated wood for many years to come.

Related: How Does Pressure-Treated Wood and Lumber Work?

Start Separating The Wood From The Soil

  • Concrete Is Used To Enclose The Wood
  • Surround The Wood In Gravel
  • Cover It With Plastic
  • Seal The Edges With Silicone Caulk

Concrete Is Used To Enclose The Wood

You can also use concrete to enclose the wood. This will protect it from water and rot.

Start by putting a layer of gravel down, then surround the wood with concrete. Be sure to leave enough space for the plastic to fit around the wood.

Cover the concrete with plastic, then seal the edges with silicone caulk.

This method is more expensive than using a sealer, but it will give you the best protection for your pressure-treated wood.

Surround The Wood In Gravel

Another way to protect pressure-treated wood is to surround it with gravel. This will allow water to drain away from the wood, preventing it from rotting.

Start by putting a layer of gravel down, then surround the wood with more gravel. Be sure to leave enough space for the plastic to fit around the wood.

Cover the gravel with plastic, then seal the edges with silicone caulk.

This method is less expensive than using concrete, but it will still give you good protection for your pressure-treated wood.

Cover It With Plastic

The final way to protect pressure-treated wood is to cover it with plastic. This will keep water and moisture away from the wood, preventing it from rotting.

Simply put a layer of plastic down, then place the pressure-treated wood on top of it. Be sure to seal the edges of the plastic with silicone caulk.

This method is the least expensive, but it will not provide as much protection as using a sealer or concrete.

Seal The Edges With Silicone Caulk

Once you have chosen your method of protection, be sure to seal the edges with silicone caulk. This will prevent water from seeping in and causing the wood to rot.

Simply apply a bead of silicone caulk around the edges of the wood, then smooth it out with your finger.

Allow the caulk to dry completely before covering the wood with dirt or gravel.

By following these simple steps, you can protect your pressure-treated wood from water and rot. By taking the time to do it properly, you’ll be able to enjoy your pressure-treated wood for many years to come.

If Your Pressure Treated Wood Rots, What Causes it?

There are two main causes of rot in pressure-treated wood:

  • improper installation
  • inadequate protection

Improper installation

If your pressure-treated wood rots, it is most likely due to one of these two causes.

Improper installation can occur if the wood is not properly sealed or if it does not have adequate drainage.

Inadequate protection

If your pressure-treated wood does not have adequate protection, it will be more susceptible to rot.

To prevent rot, be sure to use a sealer or concrete to protect the wood from water and moisture. By taking these simple steps, you can extend the life of your pressure-treated wood and prevent it from rotting.

With No Further Treatment, How Long Will Pressure-treated Wood Last Underground?

Under ideal conditions, pressure-treated wood can last up to 40 years underground.

However, there are a number of factors that can shorten the lifespan of pressure-treated wood, such as:

  • exposure to sunlight
  • exposure to water
  • inadequate protection

If your pressure-treated wood is not properly protected, it will be more susceptible to rot and decay.

To extend the lifespan of pressure-treated wood, be sure to use a sealer or concrete to protect it from water and moisture.

FAQs

How can I tell if my pressure-treated wood is rotting?

If your pressure-treated wood is rotting, it will likely show signs of discoloration, warping, or cracking.

Can I use pressure-treated wood for raised garden beds?

Yes, pressure-treated wood may be used in raised garden beds. However, make sure you pick a type of pressure-treated wood that is safe for use in gardens, such as ACQ-treated timber.

Can I use pressure-treated wood for decking?

Yes, pressure-treated wood can be used for decking. However, make sure you get ACQ-treated lumber, which is safe for use in gardens.

Can I use pressure-treated wood for fencing?

Yes, you can use pressure-treated wood for fencing. However, be sure to choose a type of pressure-treated wood that is safe for use in gardens, such as ACQ-treated lumber.

About the Author

Passionate about helping households transition to sustainable energy with helpful information and resources.

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