Thanks for the reply cdbe
I may have missed something but unfortunately as the new loft floor requires Beam B to be installed, it’s not possible to prop up onto the new floor while installing beam B itself?
I’ve attached a drawing to show the existing, temporary and final diagrams to help show the question.
The structural engineer has designed our loft with 2 floor steels and a ridge steel. The installation of the first floor steel (beam A) is simple, as nothing needs to be removed to install it...
Out of interested for option C - how would you install this and keep the rafters in place? I can see how the option D steel would be install with the current roof in place. However option C looks like you’d need to take down both sides of the roof, then rebuild the front/rafter side? Therefore...