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« on: 01 September 2023, 13:24:05 »
Its the usual media flap.
RAAC is a very good structural solution but, like everything, it needs to be looked after. The major issue is maintenance, if its kept dry and was manufactured and installed correctly in the first place, it can last a very very long time. What is being seen is leaking flat roofs (its often used to create structural roof panels and beams as its very strong and also a fraction of the weight of the equivalent concrete) corroding the structural steel rods and blowing the RAAC, there have also been cases where the form was manufactured wrong or installed wrongly (upside down!).
So in summary, its less tolerant to poor maintenance, manufacture and installation.........and that is what we are seeing now.