Two years ago, I laid a flagstone patio on stone dust and filled the
joints with mortar. That is, I dumped the mortar on dry, swept it
into the joints with a broom and sprayed it with a hose.
Since then, the mortar seems to be flaking away. Both this spring and
last, I started the year by sweeping away lots of little fragments of
the stuff. The flagstones don't seem to have moved. Is there an
obvious reason this is happening?
well if you put the flagstone on a concrete base and then mixed up the
mortor with water and mixed it correctly and then applied it to the
flagstone and then used a squeege to put the motor into all the cracks
and then used an acid to remove the stuff that got on the top of the
flagstone and it did what you are complaining about then you would have
a problem... but as you did it the mortor did not get a correct mix and
it was weak to start with and flaked away.. and the bed you have it on
is just sand and sand moves so you got what you can expect by doing it
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