Posted: Thu Oct 28, 2010 10:54 am
My 4m x 4m patio has been laid with indian sawn sandstone.
There is a mass concrete sub-base. The bedding layer is a sharp sand/cement mixture with individual bedding in places. Compacted by hand (no wacker plate).
I noticed there was a hollow sound walking on the flags/slabs. Some were "rocking" from my spot check. The contractor told me the rain would fix it, and the grout would too.
It's been a week and another 2 are visibly moving. This time I was told it's because sand is soft. And also that the natural stone isn't all the same thickness, differing by 5mm on some.
As the work isn't complete still, I haven't paid the remainder balance.
Q. Is the hollow sound normal? (It is not the dab/dob method)
Some are hollow, some aren't. The hollow ones feel like they have a bit of give to them. I haven't jumped on them yet!
Q. How can I assess if it is correct as I do not wish to lose a lot of money over this.
There is a mass concrete sub-base. The bedding layer is a sharp sand/cement mixture with individual bedding in places. Compacted by hand (no wacker plate).
I noticed there was a hollow sound walking on the flags/slabs. Some were "rocking" from my spot check. The contractor told me the rain would fix it, and the grout would too.
It's been a week and another 2 are visibly moving. This time I was told it's because sand is soft. And also that the natural stone isn't all the same thickness, differing by 5mm on some.
As the work isn't complete still, I haven't paid the remainder balance.
Q. Is the hollow sound normal? (It is not the dab/dob method)
Some are hollow, some aren't. The hollow ones feel like they have a bit of give to them. I haven't jumped on them yet!
Q. How can I assess if it is correct as I do not wish to lose a lot of money over this.