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Hi Everyone
I have been going through these discussion boards for a while and finally mustered to courage to post a question here 
This would be my first deck. Have done some landscaping for myself in the past including a raised garden bed, however nothing major. As far as tools, I've a drill kit including hammer drill, a cordked circular saw and a random orbital sander.
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My proposed deck would be 350 x 370 with height from the slab between 17 - 18 cm so it stays flush with the brick and same level as my internal floor.
I've been advised that i could use H3 structural timber (140 x 45) as joists and lay decking boards on top that.
My questions,
1. How do I attach joists to the concrete? Use galvanized angle brackets like this?
2. How can I adjust the height so the finished decking board stays flush? If i used 140 board + .5 bracket + 19 mm board = it would be around 165 cm height. Which is around 1.5 cm lower than bricks. Can I use plastic wedges / window packers to compensate for around 1.5 to 2 cm?
3. This deck would be under alfresco cover and under eaves. In terms for water drainage, what would be helpful. Would the packers / wedges mentioned in Q. 2 help with the same?
On the last image, pillar is on the corner of the alfresco slab and the decking to the south of it would be on top of soil (this would 370 x 45 cm). Not much height difference from alfresco slab. What do I need to provide here under joist for support? Not enough height for a stirrup.
Thank you very much for reading through.
Community manager's note: Check out How to build a low-level deck for expert advice.
Hi All,
I am also building a deck of size 11 x 3.5 m on the existing concrete. My clearance from the concrete to the flushed surface is around 120mm. Thinking to use
90x45mm joist. to achieve 120mm my calculation is 11mm (gap between concrete and joist) + 90mm (joist) + 19mm (board)
@Neo19 are you able to tell me (I see you responded to most of these questions earlier - sorry for my ignorance 
now i left with this only
any other recommendations please?
Thanks
Welcome to the Bunnings Workshop community @Usman. It's fantastic to have you join us and many thanks for your questions.
What you have suggested sounds fine in regards to achieving your 120mm overall height. I trust @Neo19 will respond if they can see any other issues or had recommendations.
We look forward to hearing more about your decking project and would encourage you to let us know if you need any assistance or would like to share your progress with the community. I trust you'll find loads of other inspirational decking projects as our creative members are sharing their ideas here all the time.
Mitchell
Hi @Usman,
I apologise for the delay in my reply. A gap under your joists is essential for allowing water to drain and as you have previously mentioned allowance for 11mm has been made. If water is retained under the deck, with no drainage, then a very moist environment is created. You would then expect cupping of boards.
You are creating a very low-level deck. Traditionally, decks were never created this low, partly because of styling but also due to issues that arise when building a timber structure this close to the ground. Times have changed and a low-level deck is now the go-to solution as they look fantastic and are easier to build. You will find many low-level decks which have been constructed within the community and to my knowledge, no one has reported cupping of their boards.
The 11mm drainage gap is your biggest asset when it comes to preventing water/moisture build-up under a deck and the cupping/deterioration of the timber.
Please let me know if you have further questions. We're here to help.
Mitchell
Guys finally the decking project is completed. Thanks @MitchellMc and @Neo19 for your help , very much appreciated. Sharing some pics.
@MitchellMc next project is to cover the area with bunnings bistro blinds. I have 4 panels with 3x2.32, 3.8x2.32, 3.8x2.32 and 4x2.32 m.
I see the bunnings bistro blinds are available in fixed standard sizes. For 1st panel 3m size is available however for other 3 panels I need to use more then 1 blind i guess. @MitchellMc Are you able help with what size I should use.
Thanks for your help as always.
That is spectacular work and congratulations on achieving these results. You must be extremely proud of your efforts and rightly so.
We look forward to assisting with your next project.
Well done.
Mitchell
