M MrM Member Nov 20, 2023 #1 Had an extension built. Right above this is an RSJ. Plastered and painted. Contamination or damp? Attachments PXL_20231119_163535249.jpg 2.8 MB · Views: 30 PXL_20231119_163531439.jpg 3.2 MB · Views: 27
Jord86 Screwfix Select Nov 20, 2023 #2 Guess number 1, Damp. Guess number 2, no cavity trays fitted above.
