Flagstone Chipping/Flaking

Hello,
We installed a flagstone walkway last year and soon after i noticed little flakes and chipping off top layer. I just thought this is typical of a newly installed flagstone that has just been cut and that it would stop soon after. A year later and I am still getting these chips and flakes. I had the flagstone sealed about a week ago and today i once again noticed an area that had the flake/chip (picture attached). What is going on?
How can i make this stop???

The stone was laid on concrete base. and i am in a climate zone of hot summers and cold winters.

 

Being a natural stone it's the nature of the product,

 

Once that layer of stone has flaked off there is a good chance it will stop.

 

Both correct statements... it is a sedimentary rock that was created in layers, so it's not surprising. And they do sometimes continue to flake, depending on how it was naturally made. But one caution I would give is do not under any circumstances apply salt (or any type of snow melt) to the stone in the winter time. You will destroy it in no time flat.

 

is there anyway to stop/slow down the flaking? Unfortunately the sealer that was used appears to be the non penetrating type. So I don't think it will stop the flaking. I will have to wait a few years probably for it to completely disappear to apply the penetrating one.

 

There isn't a lot you can do to stop flaking. It is layers in the rock coming loose. It's a natural erosion process. If the rock is of good quality once the loose layer has come off that should be it. You can speed the process and remove those loose bits then re-seal but no "sealer" is going to glue the layers of a bad rock together.

 

flagstone is a sedimentary material formed by pressure,,, back in the day layers were 1" thick,,, today's mtl is 'reedy' meaning lots of smaller layers - most of the good rock's gone,,, in other words, all of what the other guys said