In meeting the structural engineer, it was agreed that the lower ground slab should stay for the time being as it will be easier to temporarily prop the upper slab from this. In the meantime we have been deciding the best approach for the main structural alterations and the insertion of the steels.
First of, five of the seven side windows have been in-filled, the remaining two will come out later. In-filling the windows will strengthen the wall prior to the demolition of the lower section of this wall.
Exposing the slab edge reveals that it is supported entirely by the inner brick leaf. This makes the sequencing simpler as the slab can be supported as proposed, with an array of Acro supports below. The outer brick leaf will need supporting independently, but there is not as much load to contend with as we thought. As the sketch detail above right shows, we have a slight clash with the proposed steel now and we will need to trim the top flange such that it doesn’t foul the inner brick leaf. Our structural engineer is okay with this providing we bolt the web of the steel to the edge of the concrete slab.