To identify RAAC (Reinforced Autoclaved Aerated Concrete), key characteristics to look for include:

• RAAC panels are typically light grey or white and have a smooth outer surface.
• Internally, the panels have a bubbly, aerated texture similar to the inside of an Aero chocolate bar, without visible stones or aggregates.
• The panels are usually soft and can be indented easily with a screwdriver or nail.
• Panels are commonly about 600 mm wide and up to 6 m long.
• They often have distinctive V-shaped grooves at regular spacings (usually around 600 mm).
• RAAC is commonly found in flat roofs but may also be in pitched roofs, floors, and walls.
• The panels may be obscured by finishes like suspended ceilings or plasterboard, so careful inspection or opening up may be necessary.
• Documentation such as construction drawings may reference RAAC or supplier names like Siporex, Durox, Celcon, Hebel, Xella, or Ytong.

Due to the potential presence of asbestos in buildings from the same era, and the risk of structural failure of RAAC, it is strongly advised to seek help from a qualified building surveyor or structural engineer to confirm identification and assess condition if RAAC is suspected.