Recently there have been a few failures in these planks/panels, which has led to an alert from SCOSS and reports of failures to CROSS.
This study group is open to all to provide a place for information and guidance on RAAC. You do not need to be a member of the Institution in order to join the study group.
Join the group to receive updates
The Institution has created a list of professionally registered structural engineers (Chartered or Associate-Members) who have experience of providing solutions for managing RAAC planks.
The following are suggested steps that building owners/ managers who are responsible for the safety of buildings should follow. This will enable building owners/ managers to address any issues relating to reinforced autoclaved aerated concrete (RAAC) that may be present in their structures:
Identification – Not all buildings built between 1960 to mid 90s will have RAAC. It is therefore important to establish if they are present in your building. Identification can be undertaken by an experienced estate/ maintenance manager/ or building owner. A guide has been created to enable managers of educational buildings to identify if their buildings have RAAC. However, if you are unsure then you can contact a professionally registered structural engineer or surveyor to identify if RAAC are present. To note they do not need to be an expert in RAAC to identify if the building has RAAC
Assessment – Once you have established that RAAC has been used, your building will need to be assessed to understand what, if any, risk there is and if any immediate temporary remedial work is required. The Institution has established a list of professionally registered structural engineers who have experience of RAAC and are able to assess your building
Solutions - competent structural engineers will need to evaluate all the information (which will include a detailed site inspection) and propose the remedial works to be completed. The list of professionally registered structural engineers who have experience of RAAC can be accessed below
List of professionally registered structural engineers who are able to undertake steps 2 and 3 are listed below:
In order to be considered for inclusion on the list of structural engineers with experience of RAAC you must meet the following criteria and submit a short CV, including your IStructE membership number, to [email protected].
Join the list
RAAC Study Group guidance - Reinforced Autoclaved Aerated Concrete (RAAC) panels: Investigation and assessment
Local Government Association - Information on Reinforced Autoclaved Aerated Concrete (RAAC)
CROSS Report 908 - Failure of RAAC planks in schools
You can confidentially share your experiences on RAAC planks with CROSS
This two-day, online course extends the principles developed in the Understanding Structural Behaviour course. It covers more complex real structures and failures; and the important skills of approximate analysis for checking computer output and member sizing.
This course provides guidance on specific aspects of demolition and refurbishment from an engineering perspective whilst addressing safety, environmental and sustainability influences.
This one-day, online course offers an introduction to timber design to Eurocode 5.