Defective DPC?

[Bristol1]

Our bricklayer has installed a DPC on the inner skin of blockwork that leaves around 20mm of the block uncovered. I was concerned that this bridges the DPC and may allow rising damp to occur. He dismissed this and said that the gap is to allow for a key and avoid a slip plane (and it’s all perfectly normal).

Can I please have your thoughts?

[tonyshouse]

Wrong! DPC can be flush or poking out 

[nod]

Plus 1 

Poking out Normal 

[James Newport]

But it's not poking out, or even flush...