Patio clearance from DPC

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15 Sep 2016
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Sheffield
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Would you say in the picture the patio level from the dpc is adequate (previous owner install). Im not sure where the dpc starts. Is it from bottom, middle or top of brick where the 150mm clearance is required.
 

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I can't see any DPC.

Ideally it's 2 bricks or 150mm - mostly because that's high enough to avoid majority of rain splash
 
My understanding is the two courses of blue bricks act as a DPC, so need to confirm where 150mm is taken from (Top, middle or bottom) please?

Any advice greatly appreciated.
 
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