Can You Put Pressure-Treated Wood Directly on Concrete?: Tips & Guidelines

Can pressure-treated wood go on concrete? Yes, definitely! Pressure-treated wood is ideal for decks and patios because it resists moisture and deterioration. Prevent ground rot by placing pressure-treated wood directly on concrete.

To prevent moisture from penetrating the wood, a moisture barrier between the concrete and wood is recommended. Use plastic sheets or a waterproof membrane. This extra step will keep your pressure-treated wood in great shape for years.

Finally, pressure-treated wood on concrete is possible and durable. Pressure-treated wood can be used outside without risk of damage or decay if you use a moisture barrier.

Pressure-treated wood on concrete—ever considered it? When decorating their outdoor space, many individuals wonder about this. Important things to consider before starting. This post discusses applying pressure-treated wood to concrete and offers suggestions and warnings.

Checkout From Amazon

Understanding Pressure Treated Wood and Concrete Interaction

Placing pressure-treated wood on Concrete

You can put pressure-treated wood on concrete, but be careful because concrete can make the wood wet and cause it to rot. To stop this, use a plastic sheet between the concrete and the wood to keep it dry.

Using Moisture Barriers

To keep pressure-treated wood on concrete safe, use a moisture barrier. It’s like an umbrella for your wood, keeping it dry and lasting longer. Just add a plastic sheet or special product under the wood to avoid moisture problems.

Types of Pressure-Treated Wood Suitable for Concrete Contact

Choosing the Right Type

Choose wood that can withstand ground contact when using it on concrete. Prevent rotting and damage using ground contact (GC) wood. This wood is coated to resist moisture and deterioration in concrete.

Popular Choices

Pressure-treated Southern Yellow Pine, Douglas Fir, and Hem-Fir contact concrete well. They’re chemically treated for rot and bugs. Stores sell these woods for decks and fences that touch concrete.

Attaching pressure-treated wood to Concrete Surfaces

Challenges of Placing Pressure-Treated Wood on Concrete

Putting wood on concrete can make it rot because the wood can soak up water from the concrete. When the wood is stuck to the concrete, air can’t get under it, which can lead to mold and decay.

Solutions for Attaching Pressure-Treated Wood Securely

To put wood on concrete without damage, you can use plastic or rubber under the wood to stop moisture from getting in. Or you can use spacers or metal brackets to lift the wood off the concrete and keep it in place.

  1. Use plastic sheeting or rubber membrane as a barrier.
  2. Utilize stand-off hardware like spacers or metal brackets for elevation.

Using Pressure Treated Deck Joist on Concrete Stoop

Potential Issues

Wood-on-concrete may not be a smart idea. Concrete can moisten wood and accelerate decay. Wood stays moist on concrete because air can’t get under it. Mold can grow between the materials. Too much moisture harms wood.

Safety Steps

Use plastic shims or a waterproof coating to protect wood on concrete. Shims under the wood prevent direct contact and allow airflow. The seal on the concrete prevents water from entering the wood, making your deck stable. On concrete, this coating prolongs the wood’s life.

  • Pros:

  • Easy installation process.
  • Cost-effective solution.
  • Cons:

  • Increased risk of rot.
  • Requires additional maintenance over time.

Sealing Pressure Treated Wood with Concrete Sealer

Protecting the Wood

Pressure treated wood lasts a long time, but if you put it on concrete, it can get wet. Using a concrete sealer helps keep the wood safe by stopping water from getting in. This stops damage and makes the wood last longer.

Choosing the Right Sealer

When you pick a sealer for concrete, choose one made for the outside. Get a sealer that’s waterproof and stops the sun from hurting the wood. Some sealers make the wood look better.

Putting on more than one coat helps protect the wood from getting wet. Some sealers can also make the wood look nicer and keep it safe from the weather.

Pressure-treated lumber on Concrete Subgrade Floors

Placing pressure-treated wood directly on Concrete

Bug- and rot-resistant, pressure-treated wood is suitable for concrete floors. Wetness may modify the concrete’s color. When laying wood on the floor, employ a vapor barrier to keep water out to keep wood and concrete happy.

Moisture Barriers

A moisture barrier protects wood from moisture. Before adding wood, cover it with plastic. Check and patch the barrier holes. Seal the edges well to prevent water from entering.

Checkout From Amazon

Reusing Pressure-Treated Lumber for Concrete Projects

Benefits of Using Pressure-Treated Wood on Concrete

For outdoor use, pressure-treated wood won’t rot or deteriorate. It protects concrete from water and bugs. This helps build ground-level terraces and flower beds. It saves time and effort by eliminating needless steps. Concrete is sturdy; therefore, no extra support is needed. This simplifies construction, especially for small DIY projects.

  • It saves time and effort

  • Eliminates need for extra materials
  • Simplifies construction process

Considerations Before Placing Pressure-Treated Wood on Concrete

Before putting wood on concrete, make sure the concrete is flat and clean. Use a vapor barrier to stop too much water getting to the wood and causing problems like mold.

  1. Check if the concrete surface is level.
  2. Clear any debris that may harm the wood.
  3. Use a vapor barrier to prevent moisture.

While pressure-treated wood offers durability against elements like water exposure, prolonged contact with damp surfaces might still pose risks over time due to potential trapped moisture beneath it causing decay, eventually leading to structural integrity compromise in your project.

  • Ensure proper drainage around wooden structures.

  • Regularly inspect treated lumber for signs of deterioration.

Comparing Pink Sill Foam and Green Treated Lumber

Compatibility with Concrete

Be careful when putting wood on concrete. Concrete may damage wood by retaining water. Put plastic or foam between them to stop this. Ground-contact treated wood is better for concrete.

Protection from Moisture

Over time, dampness can destroy wood on concrete. Keeping wood dry with polyethylene or foam prevents this. The ground can be protected from moisture using specially coated wood.

Checkout From Amazon

Considerations for Using Pressure-Treated Lumber Indoors

Directly Placing Pressure-Treated Wood on Concrete

Don’t put wood on concrete ’cause it can get wet and rot. To stop this, use plastic or foam in between.

  • Moisture buildup

  • Rotting of wood

Elevating the Wood from Concrete

To prolong interior life, keep pressure-treated wood away from concrete. You can do this with treated wood sleepers or a subfloor atop the concrete. This allows airflow, prevents moisture buildup, and strengthens the wood.

  • Increased lifespan of pressure-treated wood

  • Improved airflow for ventilation


You know how to use special wood on concrete. Remember the type of wood, seal it well, and make sure it’s safe for indoors. Ready for your next project? Whether you’re building a deck or fixing your basement, follow these steps to do it correctly. Use your knowledge to keep your wood and concrete strong. Enjoy building!

Frequently Asked Questions

Can pressure-treated wood be placed directly on concrete?

You can place pressure-treated wood on concrete. To avoid moisture difficulties, choose acceptable pressure-treated wood and seal it properly.

What are the best types of pressure-treated wood for concrete contact?

Ground-contact treated lumber or specifically treated items for direct soil or concrete exposure are better for concrete contact. These are more moisture- and decay-resistant.

How can I attach pressure-treated wood framing to concrete surfaces securely?

Anchors developed for pressure-treated wood work well on concrete. Pre-drill holes in the wood and fix it with screws or bolts into the concrete.

Is it advisable to use pressure-treated deck joists on a concrete stoop?

Pressure-treated deck joists can be used on a concrete stoop if properly attached and moisture is considered. Good installation is essential for long-term function.

Should I seal pressure-treated wood with a concrete sealer before placing it on a slab?

Before placing pressure-treated wood on a slab, seal it to prevent water damage and prolong its life. Choose a sealer that works with both materials for optimal results.


Leave a Comment