Overview
AIB is a low-density board (around 600 kg/m³) made from up to 40% amosite or crocidolite fibre bound with calcium silicate. It was used extensively from the 1950s until UK manufacture stopped in 1980 and import ceased in 1985. Because of its high fibre content and low density, AIB is friable and releases fibres readily when cut, drilled or damaged.
Typical uses
- •Ceiling tiles
- •Soffits
- •Service riser linings
- •Partition walls
- •Boxing around pipes
- •Fire door cores
- •Window infill panels
- •Eaves and bath panels
Typical fibre type
Amosite is the most commonly identified fibre in this material.
Visual inspection alone cannot confirm the presence or type of asbestos. Laboratory analysis is required.
🔴 High Risk
High amosite content and low density mean fibres are released easily — any drilling, cutting or breakage poses a significant exposure risk. AIB is one of the most commonly encountered higher-risk ACMs in UK buildings.
Typical locations
Survey recommendation
Refurbishment Survey
Suspected AIB should be sampled by a competent surveyor under a Refurbishment Survey. Removal is licensed work under CAR 2012.
See our survey servicesManagement advice
- Do not disturb, drill, sand or cut suspected AIB
- Label and seal any access panels and inform contractors
- Removal is licensed work — only HSE-licensed contractors may carry it out
- Encapsulation may be appropriate where the material is in good condition
