Sloped roof - to service void or not? (I don’t want to)

[Great_scot_selfbuild]

The entire upstairs is within the roof void. We have a steep pitch and a short wall height before the steep pitch starts.

 

Having reviewed our lighting and power plans, we have no need for a service void on the sloped ceiling, and losing 37.5mm for the sake of it would be noticeable to the headroom and useable space in the room. I’m wanting a sanity check - is there anything I’m missing?

 

The sloped roof will be all boarded with airtight pro passive board, and I would assume we would screw the plasterboard to it as ‘normal’ (should we be aware of / consider any other way?)

 

Thanks

[ProDave]

Yep, if no services, put the PB straight onto the PP board without a gap.  Gives you a little more heardoom.

[Nestor]

Yes, I fixed PB next to OSB on the sloped ceilings.

Service batten only fixed to walls.

[Great_scot_selfbuild]

@Nestor appreciate the pic - thanks

[saveasteading]

a service void is nice to have but I'd prioritise the headroom.

Anyway, that 830mm vertical bit could be widened to be a SV without affecting headroom.

[Russell griffiths]

Remember your smoke alarms, you would need power to them and inter linked to the other alarms, add in a conduit to pull the cables through somehow. 

[Great_scot_selfbuild]

14 minutes ago, Russell griffiths said:

Remember your smoke alarms, you would need power to them and inter linked to the other alarms, add in a conduit to pull the cables through somehow. 

Yes - planning to do this with the internal walls and. There will be a void in the ceiling (small flat section at top). 
 

All these comments are very useful reminders - I’ve thought about many/most of them, and am creating a checklist but I’m looking at one aspect there’s a risk of forgetting another!