When exposed to damp situations such as trapped water, pressure-treated wood will rot in concrete. Pressure-treated wood placed in the ground may survive for up to 40 years if maintained in ideal conditions. When vertically set in a non-draining concrete base, pressure-treated wood may only last a few years.

How to Install Pressure-Treated Wood in Concrete and Avoid Rotting

If you are installing pressure-treated wood in concrete and want to avoid rotting, be sure to:

  • First, lay a gravel base
  • Concrete Around The Wood
  • Slope The Surface

First, lay a gravel base

Once you have dug the hole for your post, place a layer of gravel at the bottom. This will help with drainage and prevent the wood from coming into direct contact with the concrete, which can cause it to rot.

Concrete Around The Wood

After you have placed the gravel, mix your concrete and pour it around the wood. Be sure to leave some space between the wood and the concrete so that water can drain.

Slope The Surface

When you are finished, be sure to slope the surface away from the post so that water will not produce puddles around it.

You can do this by making a small mound of dirt around the post or by adding a few inches of gravel to the ground around it.

By following these simple tips, you can avoid having your pressure-treated wood rot in concrete.

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

The Steel Bracket Solution

There is another way that you can avoid having your pressure-treated wood rot in concrete, and that is by using a steel bracket.

You can find these brackets at most hardware stores, and they are easy to install. Simply drill a hole in the concrete, insert the bracket, and then screw the wood into the bracket.

The steel brace can be painted to increase its longevity and resistance to oxidation. And since the wood will never touch the concrete, we’ve effectively dealt with the problem of water pocketing within the concrete, increasing wood rot risk.

This method will not only keep your pressure-treated wood from rotting, but it will also make it more secure.

Related: Super Simple Ways How To Dispose Of Old Deck Wood

Can Pressure Treated Wood Be Buried In Dirt

There’s no problem with burying pressure-treated wood in the dirt, as long as the wood is still exposed to air.

You can bury it a few inches underground, or even a few feet, and it will be just fine. The only time you need to worry about burial depth is when you are putting pressure-treated wood into a concrete footing.

This is because concrete is a porous material that can hold water, and if the wood is buried too deep in the concrete, it may not be able to dry out properly and could rot.

The best way to avoid this problem is to use a steel bracket, as we mentioned before. This will keep the wood elevated above the concrete and allow it to dry out properly.

Related: How To Protect Pressure Treated Wood Underground (TODAY)

How Long Will Untreated Wood Last On Concrete

As long as the wood is kept dry, it should last indefinitely.

However, if the wood gets wet, it will start to rot. The amount of time it takes for the wood to rot will depend on how much water it is exposed to and the type of wood.

Some woods, such as cedar and redwood, are more resistant to rot than others. However, even these woods will eventually rot if they are constantly exposed to water.

To extend the life of your wood, you can paint or seal it. This will help to keep moisture from penetrating the wood and will also make it more resistant to insects.

You can also use a steel bracket to elevate the wood off of the ground and keep it from direct contact with water.

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

Moisture Barrier Between Concrete And Wood

The best way to create a moisture barrier between concrete and wood is to use a sheet of plastic.

You can find this at most hardware stores, and it is easy to install. Simply lay the sheet of plastic over the concrete before you place the wood on top of it.

This will create a barrier that will keep moisture from seeping through the concrete and getting to the wood.

You can also use a steel bracket to elevate the wood off of the ground and keep it from direct contact with water.

No matter what method you choose, be sure to keep an eye on the wood and check it regularly for signs of rot.

By following these simple tips, you can avoid having your pressure-treated wood rot in concrete.

No matter what size post you are using, like 4×4 or 6×6, you should always use a post base. A post base is a metal or plastic plate that is attached to the bottom of the post to keep it from coming in direct contact with the ground.

This will help to keep moisture from seeping up through the ground and into the post, which can cause the wood to rot.

You should also use a post base if you are attaching the post to concrete. This is because concrete is a porous material that can hold water, and if the wood is in direct contact with the concrete, it may not be able to dry out properly and could rot.

FAQs

Can you pour concrete around a treated post?

The presence of groundwater in the area surrounding your fence will speed up decay and rot in the posts. Groundwater causes dampness, which is an environment that encourages fungus and mildew growth. When pressure-treated poles are installed on a foundation, the fungus will spread slowly. The concrete should be poured around the post – not under it – to prevent the post from wicking up water.

Do you need to put gravel under concrete?

You might not think of gravel as being particularly absorbent, but it actually does a pretty good job of soaking up moisture. This can be a problem if you’re pouring concrete over gravel because the moisture can cause the concrete to crack and crumble. To avoid this, you should put a layer of plastic down over the gravel before you pour the concrete. This will create a barrier that will keep moisture from seeping up through the gravel and into the concrete.

How long will a treated 6×6 last in the ground?

It can survive up to 40 years in ideal circumstances. However, if the wood is continually moist, it will decay. The length of time it takes for the wood to rot is determined by how much water it is exposed to and the type of wood.

How to treat old pressure-treated wood?

Old pressure-treated wood may have lost some of its water repellency and be more susceptible to rot. To treat old pressure-treated wood, you can paint or seal it. This will help to keep moisture from penetrating the wood and will also make it more resistant to insects. You can also use a steel bracket to elevate the wood off of the ground and keep it from direct contact with water.

Why is pressure-treated wood cheaper?

Over the course of its lifetime, pressure-treated wood works out cheaper than regular wood. The initial investment is higher, but it pays for itself in the long run as it doesn’t need to be replaced as often. Regular wood will rot and decay over time if it is left exposed to the elements, but pressure-treated wood is designed to withstand the elements and last for many years.

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