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Beneath the Surface - RAAC

mayura66

Updated: Nov 24, 2023


What is RAAC? -Reinforced Autoclaved aerated concrete

-Reinforced form of lightweight concrete

-Concrete without aggregate

-Common in public buildings example schools and, hospitals from 1950's-1990's

-Less common in residential

-Found in limited buildings from 1990's -2000's


Why are there concerns?

- Not as durable

- No fixed timing/lifespan; typically discussed 30 years of lifespan however this cannot be defined as lifespan is dependent on several factors

- Lifespan depends on the maintenance

- Risks and concerns are related to sudden failure which again can happen due to various reasons

- Reasons for failure could be water ingress from leaking roofs which can cause corrosion to reinforcement, excessive thermal degradation or poor original installation

-Typically made of galvanized or stainless steel reinforcement and therefore could last well in case of not coming in contact with water

-Typical period of the buildings aligns with asbestos usage in buildings and therefore when carrying out surveys asbestos surveys to be undertaken


Identifying-

- Information gathering from the Council can help, as they may have records and information

-Checking construction record drawings

-Suitable surveys by qualified persons

-Use of Space can help decide the level of risk and corrective measures required



Regular Planned Preventive Maintenance (PPM) surveys should assist in identifying & managing potentially defective materials.



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