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Hi All,
Newbie here and started doing small DIY stuff like making merbau planter boxes :). Now I am planning to start my decking and found this forum extremely helpful gaining the basic knowledge about decking, especially guidance from @MitchellMc in similarly low level decking threads. Here is my project details (please refer the photo attached -
- Total area - 6.3mx4m
- Clearence at Point#A:140mm, house slab sloping towards Point#B:150mm and then concrete apron sloping another 40mm, so total clearance at C is 190mm.
- Joists will be as shown in the photo and bearers just connecting end of the joists at A and C.
- Will attach the bearer to brick wall A with 10mm gap (using shims) and planning to joist hanger and L-brackets to hold the joists.
- Have granite pebbles in D, planning to use pavers + EcoDeck Bigfoot in that area to hold the joists.
- Will be using 90x45mm H3 pine for bearer and joists and 140x19mm merbau, so total height for joist + merbau is 109mm.
Questions:
1. Ground clearance in A is 31mm (140 - 109), B is 41mm (150-109) and C is 81mm (190-109). Based on this, is L-bracket a good option? If yes which L-bracket should I choose?
2. With L-backets, I probably have to use shims underneath the joists, isn't 81mm too high for using shims? what are the other options I got? Looking for options other than EcoDek foot (planning only to use it in the pebbles area D).
3. Need help with detail specs of dynabolts, L-brackets etc. suitable for the above project.
Many thanks :).
Welcome to the Bunnings Workshop community @Sujoy. It's terrific to have you join us, and many thanks for your question about constructing a deck.
For your setup, using L-brackets can be a good option where ground clearance is limited, such as Points A and B. When installing, aim to position the fasteners in the middle of the joist height, avoiding the top and bottom edges to prevent any splitting or weakening. Many DIYers go for heavy-duty galvanised brackets, which provide solid support and resist corrosion. A tip here would be to set up one joist at the required height first, then try a few L-bracket types to see what works best with your setup. Take a look at the Carinya 100 x 100 x 50 x 4.5mm Hot Dipped Galvanised Angle Bracket and Carinya 150 x 150 x 75 x 6mm Hot Dipped Galvanised Angle Bracket.
For Point C, pedestal feet would work much better here. Although they’re more of an investment, pedestal feet are highly adjustable, making them ideal for leveling decks over uneven ground or slopes. They’re sturdy and provide consistent support, especially over that height.
Regarding Dynabolts, a 70mm length should be adequate for attaching to masonry, and the thickness should match the hole in your chosen bracket. Ensure the bolts penetrate the concrete deeply enough for a secure hold.
For the brackets, try to avoid placing them near the edges of the concrete to prevent cracking.
Please let me know if you have any questions.
Mitchell
