Floor - To brace or not to brace??

[monza]

I'd guess you'd be fine, but I'd do what your thinking, more is better in this situation. Laminated beam is a great choice where your blue line is. Not knowing what else is I that lower room but a telescoping jack pole in the centre of the laminated joist would be real easy and very solid.

[Ryancw]

thanks for reply, The joist is centered on a hallway