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JohnThere seems to be no guidance at all In the UK on curtain walling. That a tire will melt through aluminium very fast, and a paltry BS476 firestop between the floor and a curtain wall will then be ineffective, seems obvious. But having repeatedly had a contractor argue the point, I have to wonder why this design guidance is so lacking.LeoI have carried out a number of 8414 tests on systems using vented fire breaks that are currently being approved by building control on high-rise buildings. These types of intumescent fire breaks fail to last seven minutes and even the suppliers confirm they are combustible and have only been tested between two masonry walls.