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Welcome to the Bunnings Workshop community @R49hty. It's great to have you join us, and many thanks for your question about building a deck.
The best place to start your plan would be by reading through How to build a low-level deck by @Adam_W. I'd then encourage you to have a look at the many discussions and questions surrounding deck construction contributed by our members. There's plenty of helpful information that will assist you with your build.
The timber you choose is dependent on the height you have to work within. Items like doorsills can govern your max height. Typically, our members tend to use the smallest possible timber for their joists due to the limited space they're working within. This would be 90 x 45mm outdoor H3 treated Pine.
If you can let us know the height in which you'd like to build your deck, then our knowledgeable members might have some other suggestions for you.
I'll be looking forward to following along with your project and assisting as you go.
Mitchell
Hi Mitchell , thank you for your reply
The deck will be on a existing concrete pad. Its in a pool area and there are no buildings to worry about other than the free standing patio of which is where the deck will be. Can i use 70x35 with the plastic adjustable mounts spaced accordingly on each joist or do i need 90x45. The photo shows the free standing patio below.
as you suggested. There is no problem with height but the lower the better for me
You can use 70 x 35mm timber if you wish @R49hty. Using smaller dimension joists will require additional supports, so you need to account for this in your plans. I'd recommend going with 90 x 45mm and would only use 70 x 35mm if there was some type of extreme limitation to your project.
If you use 90mm timber for the joists, 19mm decking and the Builders Edge 25-40mm Minifoot Pedestal Feet set to 25mm, that will give you a platform of 134mm. That will be perfect for adding 140mm fascia boards around the perimeter. I believe a 140mm high deck is suitable for this type of floating arrangement. You don't want it too low, or it won't have much presence. However, it's your deck, and your enjoyment of it is the priority.
Please let me know if you have any questions.
Mitchell
