noggins between web joists

[gravelrash]

New Flat roof with web joists at 600 centres- installing noggins with 'Z' plates between joists bottom chord to screw partition wall top plate to but can not get 600mm spacings to align with where the plasterboard edges need to fix as webs in the way.

Anyone had similar issues and resolved it?

[TonyT]

Counterbatten?

also helps hold up insulation 

[gravelrash]

warm roof so no insulation in between joists..