My name's Kel.
Slate can be laid on a concrete slab.
It's a two step process.
First pour and finish the slab then use a shallow bed of mortar to lay the slate. The shallow bed allows to adjust for varying thickness.
You can also use gravel.
Then use something like sand or granite dust to set the slate. The sand or dust allows you to adjust the height of the slate so the walking surface is truer.
The key to either approach is making sure the area under the patio is well drained.
Make sure no water can get under that. A freeze-thaw cycle will flex the mortar joints can cause them to crack.
Use a vinyl additive with the mortar. That will allow it to flex a bit without cracking.
Does this make sense?
Have I answered your question?
This is a front walkway. It is on a gently sloping yard so I guess it drains fairly well. So is it better to put the slate on a concrete base or a gravel base?
Hi,I'm just trying to find someone to do the slate walkway. I'm in the process of getting bids. Two different people wanted to just put a gravel base down but I told them that I wanted a concrete base Thanks for checking back with me.Carrie xxxxxx
Hang in there.
Someone'll do it right for ya.