How Long Does Pressure Treated Wood Last?

Image of a treated wood

Well, wooden equipment needs protection from natural factors such as rotting and pests. Pressure treated wood comes with a top-level of preservation. Any wood that has undergone this process has every chance of defying rot and pests, the question is:

How long does pressure treated wood last?

Pressure-treated wood is great when used for outdoor structures. It has a relatively long lifespan of up to 40 years. Besides, it is less expensive

How long can pressure treated wood last?

Expert woodworkers believe that treated timber lasts a long time. Therefore, if you are in the look for proper construction materials for your home, then consider investing in pressure treated wood. 

According to Forest Products Laboratory and other research agencies, pressure treated poles in the ground can stay up to 40 years without any signs of rot. On the other hand, using pressure-treated wood in making decks or flooring can only last around ten years due to much traffic on the surface compared to the stakes-placed on the ground. 

Note that pressure treatment of the wood only makes it resistant to rot and pests. It does not make the wood resistant to water. Pressure treated lumber, when soaked or splashed with water, gets affected and can lead to the wood cracking, cupping, or bending. You still could prevent that from happening by applying protective layers and coats.

You can ensure the durability of your pressure treated decks by annual application of maintenance dose. Any approved water repellent treatment would work quite well and must be applied all over the surfaces of the wood before installation. 

How long do pressure treated fence posts last?

A properly pressure treated pine fence posts, for example, can exist for a range of 20–35 years if well installed while the untreated one only lasts between 3–7 years. In a case where large numbers are supposed to be installed, it is practical to drive them into the ground using a hydraulic post driver. Ensure that the small end is driven first. 

Why did my pressure treated lumber rot?

Whenever any treated wood decays, it’s always because of a fungal issue. These fungi are microscopic organisms; they get right into the wood and feed on it as time passes by. This continuous eating of the wood makes it decays, soften, and ultimately turn into rot. Fungi behave the same way with basically all kinds of timber, which results in the same problem.

Will pressure treated lumber rot in concrete?

Yes, pressure treated lumber can rot in concrete. However, it would take some time for that to happen, and only if the conditions are favorable-wet conditions facilitates rotting. So what exactly makes pressure treated lumber rot? Well, when treated board of wood contacts moisture, damp soil, or water, the chemical used for treatment can leach out of the wood, leaving it vulnerable to fungal activities.

How Can You Maintain Your Treated Wood?

Regular monitoring of your railing, wood deck, fence, and other structures in your yard is critical in keeping your pressure-treated lumber in the best shape possible.

Here are some of the common and naturally occurring problems and how you can protect your wood against them:

Shrinking and Swelling

Constant absorption and loss of water by your pressure treated wood can result in natural deformations such as cupping, warping, twisting, or splitting. You can apply a sealer or opt for a semi-transparent stain for pressure-treated wood to minimize this free movement of water into your wood.

Growth of Mildew

Each time wood gets moist or exposed to humid conditions; there’s an occurrence of mildew growth. So that you don’t experience this less pleasing growth in your pressure treated wood, you’ll have to clean and stain it. Use a cleaner with a mildewcide; this way, your treated wood will retain its brightness and beauty.

UV Protection 

Wood needs protection against UV light. If you are looking to conserve the original color and appearance of your pressure treated wood, then clean your deck periodically. Other than that, apply a water-repellent sealer with an ultraviolet stabilizer. This stabilizer does not entirely prevent eventual discoloration of the wood. However, it slows the process of discoloration.


Pressure treated lumber can last at least four decades. These figures are not fixed because they can last longer than that. What brings the difference and determine how long your wood last is the maintenance practice. Proper care of your treated wood can make it last way more than four decades. If you have a structure constructed using a treated lumber, ensure that you follow maintenance practices discussed in this article. That way, you will be smiling for as long as you want.

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