Can You Put Decking on Wooden Joists?

M. John
Remove a Deck From My House

If you want to install composite decking, you can use wooden joists. Wood is a good joist material and will last long. However, some homeowners use aluminium joists for their ultradecking because of the downsides of wood. If you choose wood for your decking joist, don’t just use any wood type. You have to select the best wood for your composite decking joist to make it last longer.

What is a joist?

Can You Put Decking on Wooden Joists?

A joist is a base on which you lay your composite decking. However, you can use wood to make a joist for your decking. If you see a wooden joist, you should be able to recognise one. It is horizontal wood laid on the ground or a building to serve as a base for roof or decking.

The Best Kind of Wood For a Joist

When choosing a wood for your wooden joist, choose a type that will last for a long time. There are different kinds of timber sold in the market, but it’s not all that’s suitable for making a decking joist. Wood has a lot of downsides which discourages some homeowners from using it.  But if you choose the best type of wood for your decking joist, your deck will last long.

Now, there is the untreated wood, the treated planks and hardwood. There is also softwood like cedar and redwood. Hardwood and softwood like cedar and redwood are good for making a wooden joist for your composite decking. These species of wood are more durable than untreated planks. Untreated planks are prone to insect damage within a short period of use.

Apart from that, untreated planks will swell and rot in no time. If you use untreated wood to make a wooden joist for your composite decking, your deck will collapse. When choosing a wood type for your composite decking joist, hardwood, pressure-treated wood, cedar, and redwood are good options.

Although this wood species is more expensive than the other, it will make your joist last longer. They are also resistant to insects. Insects like termites will not be able to damage hardwood, pressure-treated wood, cedar and redwood. They also will not rot like untreated woods. These are the kinds of wood that will make a wooden joist last longer.

Factors to Consider When Choosing Timber for Decking Joist


Considering your budget is essential when choosing a wood joist. A budget is the sum of money you would like to expend for your joist. The amount you want to spend on purchasing the planks for your joist should meet your budget. Some timber types are more costly than others.  If you’re planning to use hardwood to make your joist, know that you will spend more money than pressure-treated wood. The amount you budget will help you to choose a wood species that will fit your budget.


If you want to put composite decking on a wooden joist, you have to consider your location. Homeowners need to choose a kind of timber that can survive in different climate conditions. Some types of wood will readily absorb moisture from the environment. These wood types will rot quickly. If you are living in a cool area, use hardwood for your wooden joist. Hardwoods are durable and will strive for different weather conditions.


The timber you should use for your wooden joist should be a type that is readily available in your locality. Some kinds of woods are common in some areas while you can hardly find them in other areas. So choose a wood type that you can easily buy when you go to the market.


Keep in mind that for wood to last long, you need to maintain it. Some wood types may be easy to maintain, while others might be expensive to maintain. So when selecting wood for your decking joist, keep in mind that it will still need some form of maintenance. You may need to seal the wood to make it more resistant to water or moisture.


Can you put composite decking on wooden joists? The response is yes. You can put composite decking on wooden joists when constructing a deck. Ensure you use the best kind of wood to build a wooden joist.

Tags: decking joists

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