Posted: Wed Aug 01, 2018 11:45 am
Hi,
I have a patio which is approximately 30m2 with 600x600 concrete slabs on it.
I wish to lift these slabs and replace with mixed size Indian sandstone slabs.
The existing slabs are on a sub base of builders sand. I have been at the property for 8 years and these slabs were in since before then and they have never moved / shifted or sagged.
My question is, if I was to lift these slabs and remove 25mm off the top of the sand sub base; re-compact with a wacker; and use a 25mm bed of mortar will this be sufficient as support for the slabs or do I really need to remove 4" worth of sand and put in a MOT1 type sub base?
Like I said before, the existing sub base seems very hard and all sides would be enclosed so no sand can escape.
Any advice would be most appreciated.
Thanks
I have a patio which is approximately 30m2 with 600x600 concrete slabs on it.
I wish to lift these slabs and replace with mixed size Indian sandstone slabs.
The existing slabs are on a sub base of builders sand. I have been at the property for 8 years and these slabs were in since before then and they have never moved / shifted or sagged.
My question is, if I was to lift these slabs and remove 25mm off the top of the sand sub base; re-compact with a wacker; and use a 25mm bed of mortar will this be sufficient as support for the slabs or do I really need to remove 4" worth of sand and put in a MOT1 type sub base?
Like I said before, the existing sub base seems very hard and all sides would be enclosed so no sand can escape.
Any advice would be most appreciated.
Thanks