plasterboarding garage ceiling

[eunos800]

As title says....currently it is open with joists at 24 inch centres.If I
use mainly 8 x 4 9mm plasterboard sheets, I guess the long sides will butt
up to each other "longitudely" in the centre of every 3rd joist, as well as
all along each edge, and I can nail 'em in place. However this leaves the
ends ( 4 ' ) of the boards fixed by just the three places where they contact
the 3 joists at right angles.
( if you see what I mean! ) Would this be acceptable, or will I have to fix
extra wood pieces across joist to joist where thes board 4 foot ends are?
I do Intend to have it all plastered afterwards.
It is not going to be used as a "room" as such, just that it is very cold
and hard to illuminate at present and I use it as a workshop quite a lot.
Alternatively, any suggestions of other ways to achieve a good result - EPS
Insulation sheets for example??

Also, will "external white masonry paint" be ok to use on the "breeze block"
wall? The wall is also the house wall ( internal in other words) and shows
no sign whatsoever of damp/ lime etc, ......unlike the opposite side of the
garage which is single course common brick to the outside. Is there any
special preparation I need to do before painting, apart from obviously
brushing well to remove loose chips / dust etc. TYIA

 

[masona]

Alternatively, any suggestions of other ways to achieve a good result - EPS
Insulation sheets for example??

I have done a few with suspended insulated ceiling tiles, this will give you access by removing the tiles if need be.

 

[Nige F]

Your job is just what I`ve done in my garage I used 6x3 sheets of 12.5 mm board no extra wood..just spanned with the thicker board Just waiting for warm weather and Son to plaster Masonry paint is fine ........tho` I saw some really cheap paint @ Liddel store today.wondered about that meself

 

[-dj-]

eunos, 9.5 boards will sag over that distance, you need to use 12.5mm at least.
this link may help, scroll to page 13 for all the information that you require...
http://www.british-gypsum.com/PDF/c60_103.pdf
even with 2ft/600mm you should still be putting noggins in unless you use 15mm board!!!
dj.

 

[eunos800]

Thanks for the advice guys.....useful link that DJ, looks like I will have to use 15mm boards then, as fitting noggins will be a pain.

 

[Deluks]

It is not going to be used as a "room" as such, just that it is very cold
and hard to illuminate at present and I use it as a workshop quite a lot.

If it's cold then use some sort of insulation up there, cheapie loft roll or the polystyrene type thermal stuff.

Noggins will be a pain (well, a simple job actually) but then again 15mm board will be more expensive, so work out your laziness vs. overall budget ratio