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Posted: Wed Jun 22, 2016 10:17 pm
by benney50
Hi
We have an issue with some limestone paving. They have suddenly started to turn black. The slabs were fine all winter (laid new November last year) and they are close to a silver birch tree but not all slabs (near the tree) have the black staining. We did weed and feed around 6 weeks ago.
Any help would be gratefully appreciated.
Thanks
Patrick
Posted: Thu Jun 23, 2016 7:35 am
by lutonlagerlout
this is a new one , most here worry about their limestone fading
have you a picture you can share here Patrick?
cheers LLL 
Posted: Thu Jun 23, 2016 10:14 am
by seanandruby
Could be Lichen, have you tried cleaning them ???
Bleach is as good as anything. Try a test area first.
Posted: Fri Jun 24, 2016 5:50 pm
by RAPressureWashing
It could well be Lichen, or even sap/tannin staining from the Birch tree, a photo would be good before you go any further though.
Posted: Sat Jun 25, 2016 12:36 pm
by benney50
Hi
Thanks for your suggestions Have some pics but can't find a way to upload them from my pc:(
Will try bleach, also thought about investing in this "the patio black spot remover". Any feedback on this product?
Thanks
Patrick
Posted: Sat Jun 25, 2016 9:30 pm
by RAPressureWashing
Really do need to confirm what the stain is first, which is why I said if you can post a photo before you go any further.
If it is Lichen, then a bleach mix will be fine and I can give the ratios to use it at, but need to see the stain first.
Most post photos via photobucket.
Posted: Sun Jun 26, 2016 11:16 am
by Tony McC
benney50 wrote:Any feedback on this product?
Relatively expensive and not always effective.
Posted: Tue Jun 28, 2016 6:17 pm
by Tom - Westminster Stone
What colour was the limestone paving to start with? Yellow, Black or Grey/Blue?