What is this?

Discussion in 'Painters' Talk' started by MrM, Nov 20, 2023.

  1. MrM

    MrM Member

    Had an extension built. Right above this is an RSJ.

    Plastered and painted.

    Contamination or damp?

    Attached Files:

  2. Jord86

    Jord86 Screwfix Select

    Guess number 1, Damp.
    Guess number 2, no cavity trays fitted above.

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