Have you checked the main website?
The answers to many questions are there!


Pavingexpert
The Brew Cabin
Paving, Drainage and
Hard-landscaping in
Britain and Ireland

Search Members Help

Ľ Welcome Guest † † † † † [ Log In :: Register ]

ruler

 

[ Track this topic :: Email this topic :: Print this topic ]

reply to topic start new topic
Topic: Sorry state of kandla grey patio now chalky white< Next Oldest | Next Newest >
Smiris
Offline

Apprentice




Group: Members
Posts: 6
Joined: Oct. 2019
Posted: 07 Oct. 2019,19:37 QUOTE

Hello all,
Unfortunately I canít upload photos as iím not very clever! But we bought London Stone tumbled kandla grey sandstone in July and had it professionally laid on a full bed of mortar to London Stoneís specifications. Two weeks ago it started discolouring. Itís covered in a chalky white residue that London Stone says isnít efflorescence but is down to dot and dab. But there are no circles iíd normally associate with that. Our landscaper is willing to help but equally flummoxed. Could it be efflorescence? A fault with the stone? Something to do with the tumbling process? Any ideas most welcome!
Thanks!
Back to top
Profile Personal Message 
Smiris
Offline

Apprentice




Group: Members
Posts: 6
Joined: Oct. 2019
Posted: 07 Oct. 2019,20:11 QUOTE

https://ibb.co/VxXBtNM
https://ibb.co/pj81Tjp
https://ibb.co/Pt27rF0
https://ibb.co/C1hHkv3
Back to top
Profile Personal Message 
Smiris
Offline

Apprentice




Group: Members
Posts: 6
Joined: Oct. 2019
Posted: 07 Oct. 2019,20:12 QUOTE

Worked out how to attach pics. The first one you'll need to copy and paste.
Much appreciate any replies!
Thank you
Back to top
Profile Personal Message 
Tony McC
Offline

Site Agent




Group: Moderator
Posts: 11028
Joined: July 2004
Posted: 08 Oct. 2019,11:52 QUOTE

I don't think that's eff: I think it's cement staining caused by the clueless eejits that laid the stone so badly in the first place....just look at all those amateurish crossed joints!

It certainly looks like cement hazing, probably from the jointing process - did you see how they did this part of the work?

The photies are small, which is mlimiting my certainty, but I'm 90% sure it's cement haze, and, assuming I'm right, it's going to be a bloody nightmare to rectify because, as good a stone as is Kandla Grey, it is unfortunateloy susceptible to acid and so I can't recommend such a cleaning method.

There are dozens, possibly hundreds of similar threads in The Brew Cabin about cleaning cement from Indian sandstone - run a search using the buttons above, but don't build-up your hopes!


--------------
Site Agent - Pavingexpert
Back to top
Profile Personal Message WEB 
Smiris
Offline

Apprentice




Group: Members
Posts: 6
Joined: Oct. 2019
Posted: 08 Oct. 2019,12:01 QUOTE

Thanks Tony. What a nightmare!
The contractor had two of them working on it with the hosepipe going the whole time. It was the hottest day of the year though!
Does that mean the whole thing will have to come up?
Thanks
Back to top
Profile Personal Message 
Tony McC
Offline

Site Agent




Group: Moderator
Posts: 11028
Joined: July 2004
Posted: 08 Oct. 2019,13:12 QUOTE

Not nesser celery!

It *may* be possible to clean it in-situ, but a specialist would need to see it at first hand and determine just how severe is the staining and how likely it is that repeated mild (phosphoric or citric or similar) acid washes would work, or whether something more drastic is required. Replacement would be the last option, but sometimes, it's the only way.....sadly!

What you need now is for the ever-charming Roger the Cleaning Guru to come along and give you more detailed advice......or lok up some of his many previous postings on this same subject.


--------------
Site Agent - Pavingexpert
Back to top
Profile Personal Message WEB 
Smiris
Offline

Apprentice




Group: Members
Posts: 6
Joined: Oct. 2019
Posted: 08 Oct. 2019,13:28 QUOTE

Thanks again. I feel I donít trust anyone now!
Hope someone on here can advise?
Back to top
Profile Personal Message 
Smiris
Offline

Apprentice




Group: Members
Posts: 6
Joined: Oct. 2019
Posted: 08 Oct. 2019,13:42 QUOTE

Hello again.
Just to check. Could a resin based mortar do this? That was what was used.
Thanks!
Back to top
Profile Personal Message 
R&A Pressure Washing
Offline

Pressure Washer




Group: Members
Posts: 951
Joined: Aug. 2007
Posted: 09 Oct. 2019,10:56 QUOTE

Quote (Smiris @ 08 Oct. 2019,13:42)
Hello again.
Just to check. Could a resin based mortar do this? That was what was used.
Thanks!

Yes a resin based mortar can do this unfortunately, it can be removed sometimes just takes time etc, noticed you are in the London area?
If you want to email me the photos as well, and let me know what part of London, I can come over possibly one day next week, try a few things to see what removes the stain, as sometimes it isn't as easy as saying use X product etc. My email address is in my signature just below.


--------------
Roger Oakley BDA(Europe)Member 2006
R&A Pressure Washing Services Ltd
info@rapressurewashing.co.uk
www.rapressurewashing.co.uk
Back to top
Profile Personal Message 
8 replies since 07 Oct. 2019,19:37 < Next Oldest | Next Newest >

[ Track this topic :: Email this topic :: Print this topic ]

 
reply to topic start new topic
Quick Reply: Sorry state of kandla grey patio now chalky white

Do you wish to enable your signature for this post?
Do you wish to enable emoticons for this post?
Track this topic
View All Emoticons
View iB Code


ruler

ruler