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Paving slabs Help

Discussion in 'General chit chat' started by Pavarotti, May 9, 2015.

  1. Pavarotti

    Pavarotti Engaging Member

    Messages:
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    Location:
    Monmouth
    My paving slabs in the garden usually get covered in slime and green algae over winter. I blast them clean with a powerful jet washer but over the years some really stubborn black spots have developed.

    I have tried cleaners, I have tried neat bleach and the water blasting barely touches it.

    They now look a bit nasty even after a good blasting with the jet wash.

    I see one of the tool hire companies hire a small sand blasting unit and I thought I'd try it.

    Has anyone had any experience of using one of these? Are they easy to use and more importantly do they work?.

    The slabs are the usual standard types that can be obtained at any big DIY outfit.

    Help and advice would be appreciated

    Thanks AG
     
  2. terry1001

    terry1001 Major Poster

    Messages:
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    Location:
    Ipswich
    Sandblasting makes a LOT of mess and can do a lot of damage, your slabs probably have only a thin skin of finish on them and if you go through that you'll ruin them. Unfortunately the stains may be deeply embedded in the concrete so repeated jetwashing may improve it and letting the bleach soak in may also help but try it on a hidden area first in case it looks worse than when it's stained.
     
  3. chevin

    chevin Keyboard Hero

    Messages:
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    Location:
    the Wedge Staffs
    I've had a similar problem, that black stuff won't wash off, I thought about one of those heavy duty rotary wire brushes that fit in an angle grinder and gently going over them, just depends how bad they are and how many, might not be worth it, anyway it's a thought, atb.
     
  4. tinmanofkent

    tinmanofkent Witchfinder General

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    Location:
    Westerham
    Those black marks aren't coming out, they are in the stone.

    If you want rid of them change the slabs for new and regularly dose the new ones with a fungicide wash.
     
  5. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Location:
    St. Andrews, Jockland.
  6. surrey shooter

    surrey shooter Donator

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    Location:
    camberley, surrey.
    I wouldn't bother with a sand blaster.. Have you tried a local driveway and patio cleaning company?

    What you need is a petrol Jetwash (Honda) and a turbo nozzle.


    [​IMG]

    This will get slabs looking good and will fade black spots.

    If you was local I would of come and cleaned them. We have 3 Honda Jetwash.
     
    Last edited: May 9, 2015
  7. Tripleteer

    Tripleteer Donator

    Messages:
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    Location:
    Holmfirth
    I have York stone paving slabs all around my house and I just go over them twice a year with Jeyes fluid,and then pressure wash them, and they always look good (I love the smell of Jeyes fluid really)!!!
     
  8. reaper6

    reaper6 Banned

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    Location:
    Ashby-de-la-Zouch
    Plus one for the Jeyes
     
  9. That hurts

    That hurts Barely Active

    Messages:
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    Location:
    Diss
    Jeyes is good and should reduce the spots after a few applications ... BUT if you have any animals, esp. dogs, keep them away from any treated areas until they are completely dry as Jeyes is very toxic to them !
     
  10. SteveO

    SteveO Squinty

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    Location:
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    Have you tried brick acid on them?
     
  11. tinmanofkent

    tinmanofkent Witchfinder General

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    Location:
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    Brick acid will eat green slime and fungus growth but will also eat into cement joints and the slabs themselves (possibly).

    I love brick acid. I use it for cleaning brass if I have a job with a nice front door I dip all the brass in the acid. It leaves the place looking like 10 Downing street. Also good for keeping the cement mixer drums shiny.
     
  12. Strathrpc

    Strathrpc Posting Addict

    Messages:
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    Location:
    Strathpeffer, Highlands, god's own Country
    Have you tried the old anti-fungus/moss treatment of just using the cheapest Biological washing powder from Aldi/co-op etc. Mix it up in a bucket of water and flood it onto your slabs and leave well alone. If you feel the need to scrub with a brush, go ahead and enjoy yourself but I've never found the need.;)
     

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