Laying Slabs Against Painted Waterproof Foundations - What Level?

[mitchee1967]

Hi,

I'm looking to lay some slabs infront of an extention. The foundation bricks have been painted with a waterproof paint (see attached image).
Do the slabs need to be laid 150mm below the top of these blocks

Thanks in advance.
Ed

[welsh brickie]

its hard to tell from the pictures, standard height of the slabs is 150mm below your door level, I would leave a 50mm gap from the wall to the slabs, and fill with gravel, this will aid drainage.