25mill riven paving - Laying on existing concrete sub base

[frodosdad]

I am replacing an old patio which had been laid on a concrete base. The base is in good condition but it only gives me 50mill to play with for slabs and bedding if I am to maintain the 150mill below damp course.

To achieve this I have purchased natural sandstone 25mill Riven Paving which are all cut to 25 mill plus/minus 10%.

Given the thinness of this paving would I be better laying them on a mortar bed or will 25mill sharp sand 10:1 dry bedding be OK.

If the later, bearing in mind its going on a very dry concrete base will sufficient moisture bed drawn up to cure the bed.

Any advice greatfully received

thanks Jeff

[Tony McC]

Lay on mortar - 6:1 with as little added water as possible

[frodosdad]

Thanks Tony for such a quick response. Can I just clarify would that be a mortar mix using soft sand, or would I be better of using sharp sand and perhaps some sort of plasticiser?

regards jeff

[lutonlagerlout]

personally i would lay these on a wet mix 6:1 with plenty of pva/ronafix, but thats just the way i do it
you will need a rubber mallet ,wickes do a nice one for £2.99
cheers LLL

[Tony McC]

Grit/sharp/concreting sand with a plasticiser