What are the finest joists for composite decking?

By Coowin |
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Composite decking is one of the most lasting and secure flooring options. Composite materials consist of recycled plastic and recycled wood. It is both durable and keeps the natural beauty of the wood. Now, though, homeowners are opting for composite decking materials. Now, let’s discuss the optimal joists required to construct the composite decking.

To make a deck safe and long-lasting, however, you need more than simply robust materials. The construction of a floor, from the foundation to the finish, is crucial. Planning the construction process is equally as crucial as selecting the materials. So, what is the first step while creating a deck?

Joist frame

One of the initial steps in deck construction is creating a solid foundation. In comparison to other decking materials, composite materials require less effort for the deck’s foundation. You only need to construct a sturdy joist frame as the deck’s base or support. Decking construction does not require a complicated foundation or a concrete base.

Yes, WPC decking requires easier substructures than conventional materials. Nevertheless, you will not settle for mediocrity. Keep in mind that your decor relies on these frames. Inattention to these particulars may result in bad outcomes.

Which joists are ideal for composite decking?

Composite decking has become a popular choice because of its long life and lower maintenance requirements. However, it is also essential to choose a proper joist for the proper installation of composite decks. There are numerous factors to consider while selecting joists for your WPC decking boards. Trim frames, including trim joists, are the structural backbone of a floor. To get the most out of your floor, you must lay the best possible foundation. To accomplish this, you must locate the most suitable joists.

Composite material

Like composite decking boards, composite joists are a very desirable option. It is highly waterproof, mold and mildew resistant, making it ideal for installing composite decks. In addition, composite joists are strong, durable, and long-lasting, making your frame even more durable and sturdy.

Pressure Treated Lumber

Pressure-treated lumber is a common choice for joists because it is cheaper and very easy to purchase and install. Pressure-treated lumber is treated with preservatives because it is resistant to rot and insect damage. However, there are some disadvantages to using this inexpensive and convenient material as joists.

Over time, the chemical preservatives in pressure-treated lumber can break down, making the wood susceptible to rot. As a result, pressure-treated lumber may not last as long as other types of materials and may require more maintenance and care at a later date.

What are the finest joists for composite decking


This is a more durable and long-lasting option. If you wish to install composite decking in areas with very harsh natural climates, then using steel joists is a good choice. Steel joists are usually made of galvanized steel, which is rust and corrosion-resistant and lasts longer without the need for time-consuming maintenance.

However, the steel material also has some disadvantages; it is more expensive and difficult to install. But as you use it, it is a more cost-effective option that can provide more stability and durability for your outdoor deck.

Aluminum Joists

Aluminum joists are an option that was not long in the making, but it’s quickly becoming the choice of many people. They are strong, durable, and lightweight, making them easy to handle and install.

It is also rust, corrosion, and rot resistant, making it an excellent choice as a frame for outdoor decks. Aluminum joists have a longer life span and can last for decades.

How can joists be used to construct deck frames?

The frame’s height from the ground

When deciding the material to choose, you need also to consider the height of your deck. For subfloors and patios, the frame must be protected from moisture and decay.

Therefore, if you use pressure-treated wood, you must perform a thorough job of water- and corrosion-proofing. Avoid major safety issues with the outside deck caused by the frame’s deterioration. Therefore, composite joists are the best option.

Strut Spacing

When installing joists, one must also pay attention to the joists’ spacing. It is the distance between the centers of one joist and the other. Even with the finest materials, the effect will not be attractive if the beams are not separated correctly.

Which joists are ideal for composite decking

The normal spacing in residential areas is 16 inches. While safety rules normally require 12 inches for commercial decks, Some do 24″ spacing. The planks are weaker the more space there is between the joists. Therefore, if you like a strong deck, opt for a closer joist spacing.

However, it is best to adhere to the manufacturer’s or supplier’s instructions. Additionally, you will need to comply with the construction codes of your country.

Girder thickness

The thickness of the joists might also influence the results of your deck construction. Similar to spacing, joist thickness will impact the overall floor capacity. Decks are strengthened with beams that are thicker and more robust.


Regardless of the type of material chosen for the outdoor deck. A sturdy and long-lasting deck frame is essential. A quality deck frame can extend the life of an outdoor deck. So that you do not have to worry about your family’s safety. Choosing the right frame and installing the joists correctly will also ensure the durability and longevity of your outdoor deck.

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