Sink decking on existing raised patio base - advice please

12 Jan 2009
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United Kingdom
Hi friendly people

I'm planning to lay decking in place of our current raised patio.
I'd like the top of the decking to be close to the current patio height (due to a flower bed between the house and decking, and the height of the DPC not allowing much more height) and if possible want to avoid having to remove the current base.

My plan was to lift the patio slabs, dig channels and sink a frame into the current patio base and then deck on top. The patio base is a sand/ gravel mix (see pic). I'm planning to sit the frame so that it is raised ~10 mm above the current base to allow air circulation under the boards.

1) Is this the best idea (i.e. removing slabs and sinking frame into current base) or would there be a better option?

2) If this idea would work, would I need to place a membrane (or tiles?) under the frame to prevent rot?

Thanks in advance for any help/ advice (and appologies for pics, they've been rotated when I uploaded them and don't seem to be able to correct it :confused: )
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