Permeable granite sett paving?

[simon@theperfumedgarden]

I am working with a garden designer next week and part of the front garden design is a 6m dia granite sett circle (100mm cubes). I would normally lay this on the dtp1 base and mortar bed. I would then add suitable drainage points if necessary to comply with suds.

However the designer wants the area to be permeable using a steel edge, mortared in place, a pearmeable base, sharp sand bed and Romex permeable jointing to finish.

I can not see the setts staying in place permanently.

Any ideas or experience out there?

[Tony McC]

If there's a steel edge, there's nowhere for the setts to go, and the Romex Dran will hold them steady.

I can't see a problem - this is a reasonably regular construction in Germany.

[simon@theperfumedgarden]

Thanks Tony, your have relieved all my fears. I just wasn't sure if the Romex would hold it in place.

Great site by the way. I've used it for reference for a couple of years now and it has helped me on many jobs. You should be awarded a knighthood.

[Wendage]

Hi Tony
I am in fact the mad irrational garden designer in question - thanks for reassuring me and Simon! The job will be much more fun now without him worrying

Just so other forum users know the full spec of what we'll try for the permeable granite sett paving, we'll be using:

Priora aggregate (20mm) for the sub base (compacted depth 100mm)
Priora aggregate (6mm) for the bedding layer (compacted depth 50mm)
Rompox Easy (Romex) for the permeable mortar to hold the setts

The circle area is 6 square metres in size so not huge but it's a good opportunity to try a permeable option given the new legislation for front gardens. Thanks for your page about the Romex - I didn't even know a permeable mortar existed.

[Tony McC]

Put a membrane beneath the sub-base.

And you do know that you can get 20mm CGA for about half the price of the branded Priora stuff, don't you?

[simon@theperfumedgarden]

Wendy might, but I don't. Where's the closest place to West London and also Cambridge?