What size screw and plug when lowering the ceiling?

[toker78]

I will lower the ceiling with metal studs in the hallway.
The lower and the right wall are hard concrete, the rest is 13mm gypsum and 40mm wooden studs.
The ceiling is hard concrete.

What size screws and plugs do you recommend? Brand?

How many fastening points are needed on the wall and ceiling?

Thanks!

 

[huggan]

No plugs in the concrete ceiling. If it catches fire, the plugs melt, and the entire ceiling falls down. Therefore, no material that can burn as fastening.

 

[GT3]

No plugs in the concrete ceiling. If there's a fire, the plugs will melt and the entire ceiling will fall down. So no materials that can burn as fasteners.

What is recommended instead then?

 

[huggan]

Expansion nail or use a stud gun to bolt it up.

 

[SBH]

No plugs in concrete ceilings. If it burns, the plug melts and the entire ceiling falls down. So, no material that can burn as a fastening.

oh oh, I know a heck of a lot of ceilings that need to be redone then

 

[anders07]

No plugs in the concrete ceiling. If there's a fire, the plugs melt and the whole ceiling falls down. So no materials that can burn as fastenings.

I understand the reasoning behind it, but is it an actual rule or more of a general "best practice"?

I've hung mine with moldings around all the walls and then a few plugs (with plastic plugs) here and there. You have such narrow spaces so it should work well with wall moldings.
I placed about 1 meter between each 10mm plug and sturdy washers on the screws.

 

[huggan]

Materials in roofs, walls, floors, and fixed furnishings should have such properties or be incorporated into building components in a way that they

– are difficult to ignite,

– do not contribute to rapid fire spread,

– do not quickly develop large amounts of heat or fire gases,

– do not deform with slight fire impact, posing a danger,

– do not fall or otherwise change in a way that increases the risk of personal injury,

– do not melt and drip outside the immediate vicinity of the fire source.

The level of requirements for materials depends on the amount of heat and fire gases that can be allowed to develop in the building. (BFS 2011:26)

So, it depends on the type of property he lives in. However, I still recommend avoiding plastic plugs.