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Fixing a concrete window sill

  • 30-05-2019 12:17pm
    #1
    JJJJNR
    Closed Accounts Posts: 4,791 ✭✭✭


    My concrete window sill is breaking up on the edges as below, it was breaking apart so I cleaned it and removed any loose concrete.

    2a0i24j.jpg

    Any ideas how to fix this, as its up on the first floor of the property.


Comments

  • #2
    _Brian
    Registered Users, Registered Users 2 Posts: 18,719 ✭✭✭✭_Brian


    This is caused by water getting down to the steel reinforcing which rusts, expands and breaks the concrete from within.

    If you scratch back round the steel and get back to good metal.

    Apply a good rust provider to stop the rusting.

    Use an external grade filler to put a decent finish on it.

    Paint as normal.


  • #3
    JJJJNR
    Closed Accounts Posts: 4,791 ✭✭✭JJJJNR


    Got some green Poly filla, Any way to prevent the filler from dropping off would making a thicker mix bond it ok.


  • #4
    _Brian
    Registered Users, Registered Users 2 Posts: 18,719 ✭✭✭✭_Brian


    I wouldn’t mess with the mix it may make it brittle.

    Surely a pre mixed rub would be best and shouldn’t be too thin to drop off.


  • #5
    Safehands
    Registered Users, Registered Users 2 Posts: 1,360 ✭✭✭Safehands


    _Brian wrote: »
    This is caused by water getting down to the steel reinforcing which rusts, expands and breaks the concrete from within.

    If you scratch back round the steel and get back to good metal.

    Apply a good rust provider to stop the rusting.

    Use an external grade filler to put a decent finish on it.

    Paint as normal.

    Use an SBR based sand cement mortar to repair it. get the steel properly clean first.


  • #6
    GreeBo
    Registered Users, Registered Users 2 Posts: 27,370 ✭✭✭✭GreeBo


    _Brian wrote: »
    This is caused by water getting down to the steel reinforcing which rusts, expands and breaks the concrete from within.

    If you scratch back round the steel and get back to good metal.

    Apply a good rust provider to stop the rusting.

    Use an external grade filler to put a decent finish on it.

    Paint as normal.

    As above but I would waterproof the concrete before painting with a penetrating water seal (thompsons or the like)


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  • #7
    [Deleted User]
    Posts: 14,344 ✭✭✭✭ [Deleted User]


    I had issues with windowsills breaking around the edges. I got a tub of quikrete and a bottle of PVA.

    Applied PVA to the sill, and when it dried in a bit, I mixed up some quikrete and moulded it to shape. That was about a year ago and it's still all looking pretty well and hasn't since cracked or broken at all.


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