Bullnose granite treads / copings - drip bead?

[Conor]

Hi. 

 

I've a load of bullnose granite pavers to use for two purposes:

 

- steps down from balcony

- parapet wall - for seating

 

The pavers are 350x100x30mm. There is no drip groove. Both the steps and the parapet wall are reclaimed red brick and I'm worried about eventual spalling.

 

Do I need to cut a drip groove in these? Should they be laid totally flat or a slight fall?

 

(Photos later)