We have started loft conversion today. Sadly after builders uncovered the roof they discovered that unlike structural engineer's assumption (they were buried under insulation), the existing joists are not resting on the wall but are attached to rafters which then take the load to the wall which is much lower.
I have made peace with the fact that new floor joists will have to be similarly attached to new rafters and then supported off the wall but the problem is with a new UB steel beam that will have to be supported off this wall and is considerably higher than existing joists which will cause UB sticking out of the roof. Steel beam cannot be moved due to chimney and new staircase making this the only possible configuration. My builder is saying that we will still have to support beam from the wall and he will build some sort of box covering the extent of the beam sticking out. It will obviously look hideous.
Any advice appreciated.