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Red stains on concrete

  • 20-10-2006 12:04pm
    #1
    iplogger1
    Registered Users, Registered Users 2 Posts: 277 ✭✭


    This is just a general query. I've noticed on various buildings,
    chimney stacks with no rendering, pavements a sort of leaching
    of a red colour. What causes this ? What I've seen is a streaking
    of a red colour which really doesn't look good.

    I'm really only asking because it has puzzled me for a while.
    I've not been affected by it (yet) but the curiosity was getting
    to me to know what generally causes this discolouration or
    bleaching effect.

    ~ipl


Comments

  • #2
    Kashkai
    Closed Accounts Posts: 3,399 ✭✭✭Kashkai


    One possible cause that I've come across is rust - iron or steel nails rust over time and as the water trickles away, it carries the rust with it and leaves a reddish brown stain down the side of buildings.

    No idea what would cause the stain on the ground.


  • #3
    Qwerty?
    Registered Users, Registered Users 2 Posts: 1,248 ✭✭✭Qwerty?


    afaik it's a type of algae. Mossgo kills it off.


  • #4
    Mellor
    Registered Users, Registered Users 2 Posts: 39,902 ✭✭✭✭Mellor


    A redish stain can also be caused my rebar being too close to the surface of concrete. But that wouldn't happen in pavements obviously.


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