Understanding Of Different Types Of Pressure Treated Wood


Understanding Of Different Types Of Pressure Treated Wood

As you know, pressure-treated wood becomes more and more popular in outside building projects and some inside damp areas. There are many different types of pressure treated wood in the market so it takes more time to choose the suitable one for each project. Luckily, we are here to provide you useful information on pressure-treated wood, its uses, and its types.

Definition of  Pressure Treated Wood

Pressure-treated wood is a type of wood that can resist decay, insect infestation, moisture, and fire after undergoing a special chemical process. Normally, in this process, the wood is immersed in a water-based chemical bath of preservatives.

Uses of Press Treated Lumber

Today, with preservative and chemical treatment, pressure-treated wood has become a common material in many works. It is used both inside and outside projects, both residential buildings, and heavy constructions. 

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For general residential projects, people use pressure-treated wood areas with higher humidity such as in bathrooms, and basements.  Additionally, many homes use pressure-treated lumber to make fences, retaining walls, exterior stairs, sheathing, siding, porches, decking, railings, and garden boxes.

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In constructions, wood treated with creosote preservatives appears in constructions of bridges, guardrails, and docks. Lumber treated with oil-based preservatives is used in utility cross-arms, poles, and indoor pools. 

Different Types Of Pressure Treated Wood

There are many benefits of pressure-treated lumber in life. To select the most suitable types for each project, we need to have an understanding of types of pressure-treated wood. 

This lumber is divided into four main types based on the chemical and preservative used to treat the wood.

Borate Wood

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The wood treated with Disodium Octaborate Tetrahydrate, also known as SBX (DOT) is named Borate wood. In this treatment process, people use the active ingredient of Boron. You must remember that borate-treated lumber is easily affected by the outside weather while being stored in retail yards and job sites while in transference. So, it is necessary to always keep products constructed of Borate-based wood off the ground and covered.

People only use Borate-treated wood products for above-ground interior or exterior applications without weather effection. 

Rot-Resistant Lumber

Wood treated to protect against termites, corrosion, and fungal decay is known as rot-resistant wood. We can find four types of rot-resistant wood consisting of KDAT, PTI, MCA, and CCA. 

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  • KDAT is the name of treated wood that is dried in a kiln after treatment. This process protects all wood products from all-weather affections such as moisture. From that, the wood decreases twisting and warping.

It is one of the best woods with the ability against termites and rot. This wood can combine with carbon steel and aluminum fasteners. Its weight is light, so it is easy to install. 

  • PTI is the newest chemical treatment. People apply PTI-treated lumber to exterior wood above ground. Although it still uses chemicals this process is very friendly to the environment. 

Additionally, color is an advantage of this pressure-treated wood. The lumber after treatment still keeps its natural color. 

PTI protects the wood product from decay, so you can see products of this wood type in constructions above ground including fence boards, deck framing, outdoor furniture, exterior trim, arbors, and trellises. 

  • MCA is an improvement of the PTI process. In this treatment, preservatives are distributed to all parts of the wood, and manufacturers add copper to increase rot protection. 
  • CCA wood is known as a pressure-treated wood with Chromated Copper Arsenate. Chromated Copper Arsenate is a water-based wood preservative with the greenish. Thanks to this preservative, the wood can resist decay, termites, and rot in the long term. 

ACQ Exterior Wood

ACQ wood is wood treated with Alkaline copper quat. Alkaline copper quat is a compound of copper and quaternary ammonium. This process is to paint ACQ on the wood, which helps the wood avoid outside affections. 

People use this ACQ wood to build foundations. You should store ACQ-treated wood off the flat ground, arrange it carefully to reduce warping and discoloration. 

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Non-Com Wood

People also call this lumber PyroGuard or non-combustible, fire-resistant wood. PyroGuard is lumber and plywood with fire-retardant treatment in quality control procedures of the International Code Council Evaluation Service (ICC-ES).

In this process, you should always keep the wood in a dry environment. You can store them under cover before installation, but the storage time is as short as possible. 

Besides, you also remember this product can not be exposed directly to the exterior. You should coat end cuts before installation. You should not create many cuts with this pressure-treated wood because it will increase fire protection. 

Workers use noncom woods for fire-resistant purposes of construction. The color of this wood is slightly different from the color of plain wood. It is more yellow. It is like a salt layer on the surface of the wood.

Final Thoughts

To sum up, pressure-treated wood brings excellent uses with many resident and industry constructions. With the information about pressure treated wood, its uses, and different types of pressure treated wood, we expect you have basic knowledge of each type to select the suitable types of treated lumber for projects.

Reference source: Is All Pressure Treated Lumber Created The Same? – Home Building and Repairs


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