I am planning to get a builder to remove a load bearing wall. I have had 2 quotes so far using 2 different approaches.

I have attached image of the existing wall being removed shown in red.


The wall being removed is approx 3.6m and is a colorbond roof. The wall being removed will need a hanging beam installed as I want the room to have a continuous ceiling. There is 2 strutting beams taking the load of the roof so all that would be required is a hanging beam to take the load of the ceiling.

1. First quote is to use a 300x75 F14 beam which cuts the existing ceiling joists to the same width of the beam so it can be inserted and then uses joist hangers to attach the cut ceiling joists to the new beam.

My first question is why would the new beam not sit above the ceiling joists and be supported at both ends with supporting blocks nailed to the existing top plates. The ceiling joists can then be attached to the new beam with uni ties?? of course the end of the hanging beam would need to be cut inline with the roof pitch on the external wall.

2. The second quote is to use a steel PFC beam 200 x 75 with steel brackets welded and the ceiling joists would be bolted to these steel brackets.

My question is how safe is welding brackets to the steel channel and having the ceiling joists being drilled through with bolts?

The CLW has been calculated at 3750 mm which means a 250 x 75 F14 beam would be sufficient when looking at the spanning tables.
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