My attic is already converted and the eaves are partially floored for storage but not at the end of the house. I want to floor this. My question is the current attic flooring is 70mm above the joists that don't have flooring. I thought I could use 50x50timber to cross joists at 90degrees and then the flooring is about 20mm and can sit on this. How am I best to fix the 50x50 to the existing joists? I thought truss clips, but I think these will be too deep (more than 50mm in height).
Maybe L brackets? Or some sort of 90Degree twist plate? Any advice gratefully received!