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The depth of your composite decking footing depends on the kind of foundation you are building. If you are using posts ad the foundation of your plastic wood decking, the footing should be deep inside the ground. But if you are using precast concrete as the footing, the foundation should not be too deep. The footing of your plastic wood decking matters and determine how long your decking will last. Getting your footing right is crucial if you don’t want your decking to collapse. This write-up addresses the question, how deep should my composite decking footing be?

Why Your Composite Decking Foundation Matters

The foundation of your decking raise it above the ground and keeps it standing. Decking with a good foundation will last long because the structure will be stable. If your decking foundation is strong, it will be able to hold more weight without collapsing. But if the decking foundation is not strong, adding more weight to the decking will make it collapse. Also, a footing that is not too deep will be eroded quickly if rainwater washes up your garden. That is why, if you are using posts as the foundation of your plastic wood decking, the posts should go deep into the ground. 

Type of Plastic Wood Decking Footing

decking footing

There are different types of plastic wood decking footing. If you desire to build an elevated decking, you have to use posts as the footing of your decking. But if you are building ground-level decking, your decking footing will be precast concrete or cement blocks. For homeowners that wish to build their decking on a concrete surface, the right material to use as the footing is a sleeper system. 

Posts as Your Decking Footing

You should use posts as your plastic wood decking footing if you are building an elevated decking. An elevated decking is also known as a raised decking. This decking type has posts that raise the structure above the grounds. This decking is better for gardens that have uneven surfaces. When building an elevated plastic wood decking, you need posts made of wood as your decking footing. To ensure that your decking stays strong, you must dig deep holes to put the posts. The holes should be some centimetre deep and wide enough to contain the posts. After sinking the posts in the holes, you should cover them with concrete and let them dry to have a solid footing. 

Concrete as Your Composite Decking Footing

You should use concrete as your decking footing if you are not building an elevated decking. This kind of concrete is precast and does not need a deep foundation for it to be strong. You can clear the spot you will build your plastic wood decking and arrange the precast concrete there. To make your decking strong, you can put mortar between the precast concrete and the ground so that it will stick to the ground. Precast footing need not be deep, and it is useful for ground-level decking. Since ground-level decking is close to the ground, the decking will stay strong. 

Using Cement Blocks as Your Decking Footing

Using cement blocks is similar to using precast concrete. You have to arrange the block at every corner of your decking to achieve a strong patio footing. Cement blocks do not need a deep foundation. You only need to clear where you will install the decking and then add a little cement to the base of the blocks to stick to the ground. Cement blocks are good for building ground-level decking. 

Using Sleeper System as Your Decking Footing 

Homeowners should use a sleeper system as their decking footing if they build the plastic wood patio on concrete. If you have concrete paving in your backyard, and you want to cover it, building decking on it will add style to your backyard. Another place you can use a sleeper system as the footing of your decking is if you want to build decking on your flat rooftop. The sleeper system will serve as the footing, and you don’t have to dig the concrete before installing the decking. 

Conclusion

How deep should my composite decking footing be? If you are using posts as the footing of your decking, the foundation should be deep enough to ensure that the decking stays strong in the ground. But if you are using a cement block or sleeper system as your decking footing, the foundation need not be deep. 

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