Garden Cavity Wall Supporting Decking

15 Jan 2007
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United Kingdom
I`ve had an idea to build a decked area at the top of my sloping garden, to support the decking I would ideally like to use a block wall built with a 44cm cavity to act also as a planter, to make a more private area.

The decked area would be 5mx3.5m.
The wall would be around 2 sides (3.5m) and the front (4m) to a height of 80cm the front being around 25cm higher to compensate for the slope. At one side of the front section a gap for steps (1m) was planned.
I was going to leave gaps for the decking joists and also drainage holes in the block work.

I also would of liked to render the faces of the walls if possible, as they are retaining soil is this practical ?
I did plan on using some kind of damp proofing but I am unsure if this is feasible if wall ties are required.

I planned to dig foundations slightly wider than the wall (64cm) and around 6" deep. Also stepped at the sides to compensate for the slope.

Any advice/help appreciated.
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