My thought is that you don't want decking as its a haven for Rats and the
decking will need replacing a few years on. However you do not say which way
your garden slopes, and whatever you do there is going to have to be steps
or a slope down to the garden too.
I see alot of patios made as you describe, with no obvious step, so it has
to be possible to do without having damp issues.
Brian

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"Bert Coules" wrote in message
o.uk...
I'm thinking of building a rear-garden patio raised to the level of the
interior floors, the idea being to be able to walk though the patio doors
with no step down. The height above the existing ground level would be
almost exactly 24 inches.

Decking on legs is presumably a practical possibility but I rather like
the idea of a solid construction with a paved or stone top surface. Since
this would, I assume, have to be built onto the external wall of the
house, it would breach the damp proof course. A boundary wall of brick or
blocks could be built with a matching DPC, but what is the usual
arrangement for the solid infill? An overall membrane that covers the
entire area? Or something else? I would have to trunk out the present
airbricks, but there seem to be materials specially designed for that.

Alternatively, could a solid patio be free-standing, separated from the
building by a small but definite air-gap?

Many thanks for any thoughts.