Lowering ceiling

[RobTi]

Hi so lowering my hall ceiling 4m long by 960mm wide. I have framed round the outside with 3x2 cls and also across every 600mm would you say I needed to run studs up the middle ?
Thanks

 

[freddiemercurystwin]

British Gypsum would tell you to fit the joists at 450 cts with no joist up the middle.

 

[RobTi]

Can move them if recommended to 450

 

[Deleted member 174758]

Depends on what size boards you are using, surely. 1800 x 900 then 450 centres, 2400 x 1200 then 400 centres

 

[freddiemercurystwin]

Depends on what size boards you are using, surely. 1800 x 900 then 450 centres, 2400 x 1200 then 400 centres

Sorry, I should have written maximum 450 cts which is what BG would tell you for 12.5 boards. But you are right.

 

[RobTi]

Argh more work then, wish I hadn’t asked, only kidding if you don’t know ask lol. Will make them 400 spacing then if that is what is recommended for 9mm full sheets.
Thanks

 

[Deleted member 174758]

Yes. Makes it easier to hang the boards. Do yourself a favour and put a pencil mark on the wall where each ceiling joist is, that way when you start screwing the boards to joists you'll be able to see where they are. There is cheap product called a BoardMate which makes fixing boards to ceilings much easier

 

[freddiemercurystwin]

450 is still OK for 9mm, here you go, knock youself out : https://www.british-gypsum.com/~/media/Files/British-Gypsum/SITE-BOOK/SITE-BOOK-Full-Publication.pdf

 

[RobTi]

450 is still OK for 9mm, here you go, knock youself out : https://www.british-gypsum.com/~/media/Files/British-Gypsum/SITE-BOOK/SITE-BOOK-Full-Publication.pdf

Thanks but I did 600 centres so I have to move them anyway

 

[Deleted member 174758]

The critical thing,surely, is to set the joist spacing so that the joints between boards are carried by a joist. 450mm on standard 2400 x 1200mm boards doesn't work, whereas 450mm on 1800 x 900mm boards does (conversely those boards don't work on 400mm centre joists)

 

[RobTi]

The critical thing,surely, is to set the joist spacing so that the joints between boards are carried by a joist. 450mm on standard 2400 x 1200mm boards doesn't work, whereas 450mm on 1800 x 900mm boards does (conversely those boards don't work on 400mm centre joists)

Correct but unless I can get a hand I will be cutting the sheets to what I can lift myself

 

[Deleted member 174758]

With a BoardMate and a T-prop you can board it single handed. TBH it can be easier to hire a board lifter