I wish to plasterboard my garage ceiling (I'm planning to use the garage as a woodworking workshop; it won't be used to park any cars).  The loft space is boarded,  and I plan to add insulation between the plasterboard and the loft floor.

I don't want to plaster it; just tape and fill the joints and then paint.

I really need some knowledgeable advice on the 'details' ... questions that occur to me are:

What plasterboard should I choose?  Is 9.5mm thick suitable?  Do I want straight or tapered edge?

I (think I) prefer screws to nails for fixing.  What length screws should I use?

Is there anything else I need to know that I don't even realise to ask about?

Thanks in advance ...

Thanks for the prompt reply.

Is 12.5mm to be preferred over 9.5mm for ceiling usage because it is stiffer and therefore will sag less between fixings?

Re: 'fireline' ... presumably (?) a more fire resistant plasterboard variant ... is this because it would be more suitable if/when the building is used as a garage in the future, or for some other reason?

 -- Lee

You only need a fireproof ceiling if the area above is habitable or links to habitable space.  If it's just the pitched roof loft of the garage then fire protection is not required.

If it is to be fire protected then you have to plaster it or double tack it with staggered joints.  All holes where cable or pipes pass through should be sealed with an intumescant mastic or fire collar.

To me though, it sounds like this roof space is just garage storage?

Thanks for the input; you've given me something to think about !

The area above is just the garage loft space, and the garage is detached, so I don't think the fire issue is relevant in this case; but it's good to know what would be required if it was.