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    Tryolean poor finish and damp patches


    Just had a gable end wall rendered with tyrolean leaving a very lumpy uneven finish with outlines of the blockwork showing through (ghosting I believe its called) . The original render was hacked off, then a very thin coat of a grey material was sprayed on to the blockwork before they started spraying on the tryolean, they also did not removed a wood burner flue just sprayed around existing render. Now after rainfall not only do we have the uneven finish but the area around the flue looks damp for days. Builder has offered to recover the wall due to poor finish but I am worried job was not done correctly in the first place - should there have been some form of render applied after the thin grey substance and before the tyrolean?

    Asked by Robert on 8th Sep 2021
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    Best Answer

    Mackenzie Plastering

    "The grey thin coat material sounds like a cement grout which you can do for preparation before a scratch coat which should be applied onto the cement grout whilst this is still tacky to the touch.
    Then the next day a straightening/float coat of render should be applied, leaving it to firm up then the Tyrolean finish goes on leaving a flatter and more uniform finish. This is the way in which I do this type of job."

    Answered on 11th Sep 2021 - Member since Mar 2019 - report
    The rustic carpentry co

    "You should have had a coat of sbr/cement slurry painted on followed by a minimum of 10mm basecoat/ scratch coat then a flat coat of around 10mm then tyrolean applied all with a waterproofing additive mixed into the cement."

    Answered on 19th Dec 2021 - Member since Dec 2021 - report
    L Atkin Plastering

    "It may be that the base coat is too thin and the finish has been applied by an unskilled or inexperienced renderer."

    Answered on 8th Sep 2021 - Member since Apr 2020 - report
    Aspects Plastering

    "It should have been covered with 15 mm of render consisting of two coats. One scratch coat and a second coat to adhere to that. This ensures no brickwork is showing with the correct membrane. Tyrolean is then applied when render is cured dry."

    Answered on 8th Sep 2021 - Member since May 2021 - report
    cotswolds m5 interiors

    "Hiya, after brick work was exposed a scratch coat should of been evenly distributed left to dry then the tyrolean, I also would of use an SBR coat over and direct to block work as this helps form a weather-resistant barrier plus it helps reduce the porous blockwork drying out your scratch coat too soon.
    On the other hand with dealing with the current builder, I'll assume he's got kids to feed and a family to take care of just as I do, I'd request that he can talk you through each stage and ask him to prove he's confident and can guarantee the best results. I'd like to think he's honorable and is keen on rebuilding his reputation."

    Answered on 8th Sep 2021 - Member since Nov 2020 - report

    "Yes Tyrolean is a textured finish for rendered surfaces if the brickwork is ghosting through then the background is too thin"

    Answered on 3rd Feb 2022 - Member since Feb 2022 - report
    Sean McGrane

    "Sounds like the Tyrolean is too thin and needs more material."

    Answered on 18th Oct 2021 - Member since Sep 2021 - report
    GE Restoration

    "Possibly the first coat should have been thicker providing a good base coat
    Allowing him to rectify the problem is advised but ask for photos of works in stages. If the money owed (doubtful) to them hold until satisfied see if any guarantee on works or product is included"

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

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