Leveling decking over old slabs

13 May 2008
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United Kingdom
I'm planning on decking over an old slabbed patio and could do with a bit of advice. The slabs are 900x600x50 (about 50 of them), I don't have an easy way to get rid of them and i figured they make a pretty solid base for the deck, so i decided to deck on top.

The slabs weren't installed level, the front was about 250mm higher than the back as with the run of the garden, so i lifted them, dug it out to level(ish) and layed them back down again.

So i now have an area roughly 7m x 4.5m with pretty level slabs.

I'm going to use 50x100mm timber for the decking frame, and i'm sure it won't be 100 level to every slab when i lay it down.

What would you use for packing out any small bits under the slabs if the decking frame isn't sitting on it? I was thinking i could mix up concrete and put little pads down anywhere required.

Any advice would be appreciate.

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Just use offcuts of joists or posts as legs and attach them once you have your level.
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