the beams will need a spreader padstone made of concrete to spread the load over more wall at each end which they are also asking to have the steel beams bolted down into the concrete padstone using 2x M8 (8mm diameter) bolts..
It is basically the dimensions of the Universal Beams to be used, the way they are connected to each skin of wall/supports and the size of the bolts required to do so.
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