@43d7c4ea oh, are RAAC and systems-built the same thing?

I've been wondering how linked these are, because the NAO report on schools buildings treated them as if they were fully separate?

(At least it sounded to my non-expert ears that the surveying to find and understand where these were was different and had different challenges. Specifically surveying for timber framed systems-built blocks is mentioned.) 

 @7d0b4a22 

Well, formally they are different: system building is the method of off-site prefabrication of standard components then assembled on-site.... #RAAC was one of the key components used to further reduce costs of transport (due to weight) & materials.... you can have systems building without RAAC & RAAC can be used (and has been) in other building methods. 

 @43d7c4ea Thanks, that's the impression I gained from the NAO report. I think there's much more to come out about the systems-built blocks as record keeping appears to have been patchy and proper surveying is apparently very invasive. 

 @7d0b4a22 

Yes, its a classic case of a good idea badly implemented...