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Sorry for the lateness...I used LIGHT pressure washing, about 800 psi with a fan tip, to clean all of my stone and a cleanser that said limestone safe after I got stains fixed. I wound up sanding 70ish 16x24s in 106 degrees days...twenty some hours. I was afraid a company would hone too much...

Bingo, that's my guess. They had wiped as they worked and were wiping the tops down of each coping piece. They started the field over sand after.

Yes

The other installers I've spoken with said they don't think an acid wash is going to fix it BUT nonetheless I plan to try it very very carefully....test pieces first.

EVEN the installer and owner of the company do not think that its from lot differences and I owe them $... They saw that all stones were the same prior to install. That is not the problem. Process of deduction with it being only stones over mortar means something different happened with the...

I am going to run some tests on the wipe down theory, you could be right! Had the last item been white thinset, the sponge wouldn't have been dirty or as dirty with mortar water. I didn't see a separate clean water bucket being carried around. They wiped as they set each piece and then later...

That was definitely one theory in the mix, this has been laid since 4/1. It's been 90s and broke a hundred a few times recently. We gave it 4 weeks of curing to see if it was moisture before I told the contractor I was doing a retention until we get it hashed out.

Yes, those two pieces are fully mortared - because they are partially over BB, the rest that "hung off" the BB was backfilled with extra mortar mixture to build up height. Again, I even see a slight halo around the edge that is mortared to lock the field. I promise I inspected these stones every...

Thanks jamjam :) I don't think freeze/thaw is a big concern here as we very rarely hit freezing temps. I really do think the white thinset layer would have prevented the discoloration. We have a test going right now and it's looking like the white thinset piece is going to remain lighter while...

James - Thank you for the input! See my comments in red :)

For other background to accompany these photos....I asked for a brick-lay pattern that did not have a change or transition to coping. I wanted a seamless look. At that point, I wish the contractor had presented the grouting vs. no grouting issue, as keeping that pattern there was no reasonable...

Hello all! We recently completed our owner-builder pool/spa in the Phoenix area. I named her "La Dominicana" as the finish selection was inspired by a trip I took to the Dominican Republic. I sourced white limestone/shellstone from one of the larger suppliers here, purchased through a local...