Stop work in that area and don’t investigate further — no drilling a corner off, no snapping a piece to look at the edge. Photograph it, keep people away if it’s damaged, and get it sampled. If it’s already been broken — a puncture during DIY, a smashed panel in a void — keep the room closed and unventilated to other rooms and call us: assessment, air testing and environmental cleaning are routine work, and acting quickly keeps a small incident small.
AIB turns up domestically more than people expect: garage ceilings (the single most common find), integral garage walls, under-stairs cupboards and porch linings. If a house project touches any of these in a pre-1985 home, budget for a test first — and if it is AIB, factor the licence process into the timetable: the 14-day HSE notification is a legal clock that can’t be shortcut. Fixed quote in 24 hours on 0333 335 6375.