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    Flaky paint/crumbly render


    Having to continually repaint the black plinth around the bottom of the exterior north facing wall on my 1930s house with the render being very crumbly, paint always lifting/flaking off - even if I apply stabilising solution before Sandtex masonry paint. Above the plinth is fine.

    Could this be a symptom of an underlying issue? DPC in place and no other issues....

    Asked by Trevor on 13th Mar 2021
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    Best Answer

    Precision Plastering

    "It sounds as if the plinth has no waterproofer added when it was mixed and as it takes the brunt of the weather its done its time but a proper inspection would determine this"

    Answered on 18th Mar 2021 - Member since Dec 2019 - report
    D Basquill plastering

    "Without actually inspecting the condition of the render, and the area around the property, I could assume that in fact the plinth has breached and moisture is getting into the render. By continuing to apply sand tex or any other masonry paint your trapping the moisture hence the blistering/ peeling.

    As long as there are no other issues, ie blocked drains, built up paths or land affecting water build up, I would remove the existing render, let it breath and dry out and then re apply a fresh render."

    Answered on 16th Mar 2021 - Member since Jul 2018 - report
    Jlown building

    "Sounds like not enough cement and Waterproofer in the sand and cement."

    Answered on 16th Mar 2021 - Member since Aug 2019 - report
    Jc plastering and building

    "Probably old sandy render, sounds like needs replacing of the old plinth."

    Answered on 16th Mar 2021 - Member since Oct 2020 - report
    DMC Plastering

    "Yes this is a sign of rising damp and needs looking at straight away."

    Answered on 16th Mar 2021 - Member since Apr 2020 - report
    Britannia plasterers

    "If the render is crumbling that is the underlying problem you have,the paint needs a fresh solid flat render plinth after hacking off the existing. There are excellent tanking mortars on the market these days and use a sand with low levels of salt content. Before repainting rub the new render with a low abrasion block to increase the bond of your paint"

    Answered on 11th Aug 2021 - Member since Oct 2020 - report
    GE Restoration

    "With painted masonry and water ingress gets trapped so causes render to crumble, remove complete and redo then paint every 3/5 years"

    Answered on 27th Jan 2022 - Member since Jan 2022 - report

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