Ceiling - single or double plasterboard when the ceiling is to be spackled?

[martinradbo]

I will mount a ceiling in the new build. I want a smooth ceiling and have bought 90 cm wide ceiling gypsum boards with four beveled edges to make it nice and easy to plaster. Framed at cc 45.

Now I'm thinking that I might need to put an underlying layer of gypsum/OSB to get staggered joints. I'm afraid that the joint that otherwise ends up without support will crack in the plastering after a while, if not immediately.

What is the practice in my case?

 

[oceanis]

The joint that otherwise lacks support, I'm afraid, will crack in the plastering after a while, if not immediately.

All joints should have "support." Insert a loose piece of timber before you add the next sheet if there is a lack of timber in the joint or alternatively a metal plate to screw into. I assume you are talking about the end joints.

 

[martinradbo]

Long or short edge mostly depends on which direction I screw up the boards. But since there are four recessed edges, that question might not be decisive.

But let's say I mount the long edges across the sparse paneling (according to the gyproc instructions). Then I get support for the short edges on the sparse paneling but only support every 450 mm for the long sides. I can nog these places (time-consuming), place loose nogs as you write (a bit faster), or install double layers of gypsum.

 

[Stefan N]

http://www.gyproc.se/produkter/stålprofiler/övriga+profiler+plåt+och+tillbehör/plåtband

 

[oceanis]

Depending on the drywall, I would place them with the long side along the studs and put a metal strip along the short sides. But you need to use a metal strip if you don't want to insert a loose stud piece to screw both into.

I don't understand why you would need to put up double boards. Cutting some stud pieces and placing them seems to be cheaper, easier, and less time-consuming. They don't need to be attached to the existing stud but should preferably be the width of the section.

 

[martinradbo]

That sounds sensible. I requested "praxis" for this and throwing up a piece of wood in every short joint seems reasonable. So it will be.
I would prefer to avoid double plasterboard except in a few rooms where soundproofing is prioritized.