Between them, put the foam flushing the frame.

From boards 5 cm thick or a beam 8 x 8 cm, make a frame — a frame around the perimeter of the loggia with crossbars along the length. Between them, put the foam flushing the frame. Mineral wool for these purposes is irrational — without special preliminary processing, it quickly accumulates moisture, the wooden frame becomes unusable and you will have to start all over the years in a couple of years.