Hi all, I have recently completed a project using Porcelain paving from London stone which we grouted with Ardex Flex grout and laid a head edge of granite setts.
Due to the customer wanting to purchase the tiles and grout we ended up having to lay the lawn prior to grouting ( as we had to wait for the grout and they couldn't get enough of the tiles in one hit).
The grout and tiles arrived so we could complete and clean up. I noticed brown marks on the granite which I thought was just sediment from the new lawn as both patios run towards it.
The setts will not come clean. I've been trying Lithofin Bero (initially at the recommended 1:10 to no avail. Over a few days I have been strengthening it to eventually trying it neat. Still no good.
The grout company is adamant its Iron oxide whereas the granite supplier is blaming the grout even though the stains began prior to grouting.
I've tried explaining that I'm not out to get any refunds or compensation.
I just want to get the job right so I can invoice.
If this is Iron oxide I have never seen this so prevalent in any natural stone in 20 years. Any thoughts?