Kitchen ceiling plasterboard help!

[Rojomateus]

Kitchen ceiling is 16ft 4 by 11ft 7 and joists run parallel to the long wall. I've been advised that its best to stagger sheets with their long edge at 90 degrees to the joists. 6ft x 3 ft would suit me to collect in my car (I live in a rural area) but that would mean something like having a 6ft and a nearly 6ft board for one lenght then a 4 x 3 x 5 on the next? If i use 8 x 4 I can do it slightly differently but then i have a 4 inch wide for the last length? Can i mix widths or can someone tell me how best to do this? if i need to i can get sheets delivered. I intend to use 12.5mm fire rated but does anyone have any advice on best way of fixing and brand of tape to use? Also any suggestions for solid/soundproofing insulation appreciated. And finally square edge or tapered?

 

[Wayners]

8x4 sheets aren't that size.
They are 1200 x2400 which is smaller.
After finding joists you can work out the best way to board, and you can start by cutting some off so you aren't left with 4 inches at the end.
You can also add timber if needed to support the boards to make it fit.
I hire a board lifter when I use 8x4 sheets.
It's about £55 a week and worth every penny. Why struggle...

Square edge if you are plastering.
Tapered edge but buy the 4 sided taper edged board if you are taping just the joints.
You won't get that from DIY.
Two sided tapered edge boards are for house walls, which Is what the tapered edge is just on two sides