decking questions

14 Apr 2009
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United Kingdom
I have a roof garden with concrete paving slabs
water goes through slabs and somehow drains in the corner
if I want to deck it should I deck ontop of the slabs or pull them up and deck on the water proof membrane underneath?
do I still need to put down an anti-moss etc membrane?
since I need to leave gaps for the decking to expand how do I stop dirt etc falling in the gaps and building up?
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Or even un-blocking it if it is as I suspect a Rain Collection Device.

Nice that the OP came to the electrical section to get the best advice.
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