How flat is a granite worktop?

[Tenson]

Interesting, thanks. Was it fully supported?

I've ordered a slab of 'quartz' worktop which is man-made ~10% resin / 90% ground quartz so I'm hoping it will be pretty flat.

[Voicecoil]

Interesting, thanks. Was it fully supported?

We stood it on end to try and minimise any bending. I suspect there is a good reason why large surface plates tend to be so thick, if you look at the properties of granite it's not as stiff as you might think.