Stains on sandstone paving

Client from last summer has emailed with this picture asking if it may be lichens before he tries to treat it: lichens are normally very dark or very pale and these are clearly rust colour.  Any advice greatly appreciated.

Much love

Nicky

Nicky

Tags: stains

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PRO MemberPermalink Reply by Kieran Ray on April 18, 2012 at 14:38
Hi Nicky

Yes it worked on all but 1 slab, but that slab looked like a lump of rusty iron, not stone. Its not cheep but works wounders.
Permalink Reply by Tim Bower on April 18, 2012 at 19:01

I Had a similar problem it was iron product so i rang marshalls technical advice and they told me there was not alot i could do but try 1 in 10 mix of brick acid. sand stone quickly sucks in the product.

hope this helps.

tim 


Premium SupplierPermalink Reply by Steve London Stone on April 19, 2012 at 9:20

What Phil says is the most likely outcome.  All natural stone has traces of iron in and it is just a case of the oxidisation process bringing it out.  When we started out in the stone business, as well as stocking our own products we would also display some global stone products.  We installed some of their yellow glory limestone at our showroom and after a couple of weeks we were horrified to see that there were rust patches everywhere.  After 4-5 weeks it was gone.

I would not worry about it.  It will just rust away with time.

All the best

Steve
 
phil smith said:

it could also be that the stone already had traces of iron in them when they were mined, and now they have been laid and they have been out in the elements of our weather they are naturaly going rusty.

Permalink Reply by Thermo on April 19, 2012 at 16:09

the good thing about sandstone is its fairly easy to clean. If it is a surface lichen then a good scrubbing off with either a wire brush, or stiff broom and damp sharp sand works wonders. personally i try and avoid any chemicals on sandstone as it can cause so much immoveable damage


PRO MemberPermalink Reply by Gardens4u.co.uk on April 23, 2012 at 2:35

try eco-chem  biodegradable moss & algae remover spray.......

Moss and Mould Remover

 

if not jet wash lightly?

 

fail:  relay new replacement slabs  :)

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