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DIY Decking Tips

January 1, 2020


If you are contemplating building your own outdoor timber deck, we recommend that you consider the following key points before you commence with construction –

Preparation is Paramount

As with all major construction projects, the preparation and planning are critical in producing a durable and stylish deck that is optimum to your environment and climate. We strongly recommend that you consider the following points when planning your decking project –


The direction and flow of air movement around the deck is very important. Insufficient airflow beneath your structure will result in excessive moisture during the winter months and this will translate through to your timber substrate, causing all manner of problems.


Ensure you have sufficient clearance surrounding perimeter of the decking structure to help with the movement of air flow. This will prevent excessive moisture build up under decking in turn preventing the timber becoming a sponge for moisture.

Other Surfaces

Consider what other surfaces surround the deck and how they will impact the accessibility, design and build. Allow for expansion and contraction of the structural frame and also water movement in between surfaces.

Selecting Materials

Many considerations should be made when selecting your timber and hardware –

What can I afford?

Your budget is always an important factor.

What substrate material will I use?

Timber substrates are recommended over metal substrates to allow the timber to contract and expand naturally with seasonal temperature fluctuations. Treated pine, H3 and H4 rated is always recommended for the combined above ground and in ground use however in high termite areas, a metal substrate may be preferable. It is important to consult with your engineer on structural compliance.

What colour should it be?

Natural decking timbers and man made composites are available in a wide range of colours and finishes. Check what will be a good match with the style of your home’s exterior finish and also will it be a compliment to your internal timber floor?

Will it be suitable to my climate?

Certain timber decking options will handle the harsh WA climate much better than others. There are 3 class ratings with hardwoods, choosing the correct option will depend on exposure levels and location of the deck.

What is the Class Rating of the timber?

The class rating is based on how long the timber will last in varied levels of exposure. There are 4 levels of class ratings and the higher the number (4) the less durable it is. The lower the number (1) the more durable it is. It is also important to factor in the level of protection required to keep the natural decking looking good for years ahead.

What furniture will be placed on the deck?

Consider the weight, colour, style and size of the furniture that you are placing on the deck. Ensure pot-plants and planter boxes will not allow pooling of water which may result in unsightly stains. A deck that is kept uncluttered is much more user friendly and far easier to look after.

Want to Learn More?

Contact Paul at Timber Decking Supply Shed for all of your DIY decking requirements in Perth.