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Render of Concrete Letterbox is cracked?

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  1. #1
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    Default Render of Concrete Letterbox is cracked?

    Hi, I think my concrete letterbox render is cracked due to strong sunlight. How to fix it?

    A bit curious, why the render color is a bit yellow? Which is quite diff from what I bought from bunnings, generally bunnings render color is off white

    Thank you if anyone could advice how to fix this kind of letter box.

    img_20220330_115526.jpg
    img_20220330_115536.jpg
    img_20220330_115517.jpg

  2. #2
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    Is it made from concrete block?

    Tools

  3. #3
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    yes, I think so

    The house was made by concrete block, what's diff compared with double brick?

  4. #4
    3K Club Member johnc's Avatar
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    The cracks follow the mortar lines, normal movement on a thin render. You can use a paint designed to cover fine cracks or re render. It looks as though you have cracks near the edges which would indicate no base coat used if acrylic render is the top coat.

    If keen you wrap in a fibreglass mesh and apply another top coat of render

  5. #5
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    Quote Originally Posted by deliriousmagica View Post
    Hi, I think my concrete letterbox render is cracked due to strong sunlight. How to fix it?

    A bit curious, why the render color is a bit yellow? Which is quite diff from what I bought from bunnings, generally bunnings render color is off white

    Thank you if anyone could advice how to fix this kind of letter box.



    Remove any loose material,fill with exterior filler and paint with exterior texture paint.Dulux fine or medium texture would do.Will last much longer than render.
    Cheers Blocker.

  6. #6
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    Quote Originally Posted by Blocker View Post
    Remove any loose material,fill with exterior filler and paint with exterior texture paint.Dulux fine or medium texture would do.Will last much longer than render.
    Cheers Blocker.
    Thanks very much for your advice.

    I want to fix the issue this Easter.

    I used my normal 38mm putty knife to remove loose material.

    The sad truth is I removed around 60-70% render, just by a putty knife.

    The loose render is everywhere.

    I cannot use filler to fix the issue.

    Since the issue is almost everywhere.

    I have to re-render it again

  7. #7
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    I checked bunnings prod, previously used METAL 90 degree External Angle Plaster Trim is for internally used only.
    We can see it is already rusty.

    I decide to use PVC 90 degree External Angle Render Trim https://www.bunnings.com.au/siniat-2...-trim_p0730374 to replace old trim.

    I saw this PVC trim has two types: 2.5mm and 3.5mm . No idea what's the diff.

  8. #8
    3K Club Member johnc's Avatar
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    Quote Originally Posted by deliriousmagica View Post
    I checked bunnings prod, previously used METAL 90 degree External Angle Plaster Trim is for internally used only.
    We can see it is already rusty.

    I decide to use PVC 90 degree External Angle Render Trim https://www.bunnings.com.au/siniat-2...-trim_p0730374 to replace old trim.

    I saw this PVC trim has two types: 2.5mm and 3.5mm . No idea what's the diff.
    On external render I don't use trim at all, you plaster to a straight edge to get a good line, greatly reduces the risk of failure.If using plastic go for the one that gives the thicker render which I assume is the 3.5mm. Up to you I'm no expert by any means.

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