On 12 Nov,
The Nomad wrote:

The question si as the joists are 15" centres - not a divisor of standard
board sizes, which way to run the boards and should I/ do I need to nog
the joins/edges of the boards?

You'll not need to nog the joints. Put the length across the joists and cut
to length (you'd lose 4" on an 8' board) to put joints in the middle of the
joists.

I would use taper edge boards (thickness to suit fire regs, 9.5 would span
ok) and just tape and fill the joints.

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