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Update: From the ridge to the walls there are 2 purlins. Each purlin is supported in the brick wall at each end. I am making the assumption that the pieces of wood attached to the purlin is for holding the ceiling joists up rather than supporting the purlin. All upstairs walls are brick and of...

Apologies, missed the Qs Purlins are from wall to wall across the loft space, not supported by anything other than the brickworks. So the steel at the back, the one on the right would be under a current purlin, so why would it be needed, as there is nothing supporting the purlin currently...

Marked out where there are currently big thick joists holding the roof up. These are also on the other side too. This is from the room below looking towards where the dormer will be. So my thoughts being that the current lower joist would carry on holding the roof up, rather than a new piece of...

Thank you for a prompt reply. screen grab from the structural chap. Understand the ridge beam steel, as it is needed because the dormer hangs from it. Why do I need another steel to support on the RHS ? If it is for supporting the rafters, why can't we make use of whatever is supporting the...

Hope someone can answer the query. I understand the steel required for the ridge, as this is where the dormer will hang from. Why do we need steels for the floor joists when there are brick walls upstairs for them to rest on? Many thanks.