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How much gap under a terrace wall coping stone when using external cladding

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Hi , I am having Cedral Click installed on a wall that goes up to a terrace.

I was thinking of using a flat slate lintel/coping stone on top of the terrace wall  but Cedral requires ventilation and a mesh profile so i am wondering how much of a gap under the coping stone I will need (10mm seems to be mentioned in the context of a soffit.) and also how much the coping stone should extend away from the wall to stop water ingress.....


any comments or advice ?

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