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Smoothing render before painting

  • 27-08-2025 01:15PM
    #1
    RobertFoster
    Registered Users, Registered Users 2 Posts: 9,461 ✭✭✭


    Part of the rendering on my neighbour's porch broke off earlier in the year.

    She had some roofers in recently doing other work and they filled the gap with whatever they were using on the ridge tiles and then covered the edge with flashing.

    Screenshot_20250827-132224.png

    She's not happy with the finish and asked me to get it closer to the original before painting.

    I'm not certain what to use. Is it a sand and cement job or is there something else I should get?

    Thanks.



Comments

  • #2
    10-10-20
    Registered Users, Registered Users 2, Paid Member Posts: 9,693 ✭✭✭10-10-20


    https://www.boards.ie/discussion/2058422763/smoothing-render-before-painting

    Hmm, tricky one. It probably failed due to frost action on the extremity areas of the porch.

    Sand a cement would be best if you were to fix it, but it's going to be a job to fix that nicely. It needs to be taken back to the bare concrete and then rendered in a layer or two. You should add in a plasticiser to the mix to make it easier to work with and the reduce the amount of water in the mix. I'd baton it all out after removing the existing/new/bad render then throw a cement slurry on it to give it a fresh key. Then work the render into it. Then give it 20 mins to start to go off and hit it with a soft/damp float to close the surface and bring up the grit.

    Option 2: Fit a black (or white) PVC fascia board and have a nice cup of coffee instead of the hardship.



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