Cafodd RAAC ei nodi mewn rhannau o do fflat yn Ysgol Trefnant yn Sir Ddinbych yn dilyn archwiliad manwl. Fel mesur rhagofalus, penderfynodd Cyngor Ddinbych gau'r ysgol dros dro tra bo gwaith lliniaru pellach yn cael ei gynnal.
RAAC was identified in areas of a flat roof in Ysgol Trefnant in Denbighshire following a detailed inspection. Denbighshire Council, as a precautionary measure, took the decision to temporarily close the school whilst further mitigation works were completed.