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Posted: Thu Apr 17, 2008 7:59 pm
by matsfc
We laid this patio approx. 1 month ago, after approx. 2 weeks these marks were noticed on 3 flags. It looks like rust, and after reading this site I came to the conclusion that perhaps something had been spilt on the flags (with acid content) and it was reacting with metals in the stone.
However the second picture shows new markings that have just appeared too. We haven't used any acid on the stone and the markings are appearing on lots of different flags now.
We were going to change the first 3 flags but the problem is happening on other flags now on this job, so i'm wondering if anyone has encountered this before. Intially the markings were all on the same coloured flags but its now happening on other shades of the stone too.
We have laid thousands of india stone flags and never had this issue before. I'm desperatly hoping for some advice as our customer is understandably annoyed but we don't want to keep lifting flags only for the problem to continue. Cheers.
Posted: Thu Apr 17, 2008 8:39 pm
by Pablo
Have you or the client spread any fertiliser recently?.
Posted: Thu Apr 17, 2008 9:12 pm
by warnergrounds.co.uk
Excuse the girlie comment but it looks like there is the same colouration on the jointing. That would suggest its something to do with the sub grade rather than the slabs?!?!?!
Come on boys you all wanna tell me I'm wrong.....
[awaiting lots of giggling from you lot]
Lar
Posted: Thu Apr 17, 2008 9:23 pm
by MRA
Could potentially be the iron ore content with the sandstone reacting due to its exposure to the elements. Well, it has been sited within the stone for 1000's of years with no exposure to chemical reaction until it was quarried.
Hey, it's natural. People are supposed to love natural these days!
Posted: Fri Apr 18, 2008 12:19 am
by matsfc
warnergrounds.co.uk wrote:Excuse the girlie comment but it looks like there is the same colouration on the jointing. That would suggest its something to do with the sub grade rather than the slabs?!?!?!
Come on boys you all wanna tell me I'm wrong.....
[awaiting lots of giggling from you lot]
Lar
the colouring has run into the grouting- its deffinitly comming from the flags
Posted: Fri Apr 18, 2008 12:21 am
by matsfc
Pablo wrote:Have you or the client spread any fertiliser recently?.
saw her gardener today but didn't ask that, but i doubt it as its just lawn next to patio
Posted: Fri Apr 18, 2008 12:31 am
by matsfc
deleted
Posted: Fri Apr 18, 2008 6:53 pm
by Pablo
I was talking about lawn fertiliser. The reason I ask is that I have seen fertiliser make marks exactly like these all the time. The staining is nothing to do with the flags as the stains also originate in the pointing.
Posted: Sat Apr 19, 2008 4:08 pm
by lutonlagerlout
iron deposits in the stone,natural look
what did you point it with? looks a bit ragged for a month old?
LLL
Posted: Sat Apr 19, 2008 4:49 pm
by Dave_L
Hell that looks horrible - but how can it be deposits in the stone when the pointing is now 'contaminated'?
Fertiliser looks to be the favourite culprit.
Posted: Sun Apr 20, 2008 6:52 am
by seanandruby
They are too round and uniform to be in the stone. Looks like drops of liquid, or somethig rusting.
Posted: Sun Apr 20, 2008 7:11 am
by Dave_L
The result of somebody doing some metal grinding nearby?
Posted: Sun Apr 20, 2008 8:19 pm
by lutonlagerlout
the neighbours havent recently sprayed their fence with one of those pump gizmos have they?
LLL ???
Posted: Wed Apr 23, 2008 1:10 pm
by TheVictorianCobbleCo
Big circle - tin, small circle - lid, small marks - splash from brush or similar, run from slab to grout - liquid something.
Posted: Wed May 07, 2008 10:50 pm
by matsfc
well its a mystery, can't pinpoint it to any external thing so just going to have to put it down to metal comming out of the stone and change it (it was a very random batch of stone), customer denies any other stuff so i guess its a case of try and break even and keep customer happy- damn i wish marsalls did india stone this cheap- they would have paid for us to re-do it lol