New Ceiling Cracking Along Joints

G

Gazry

New Member
Recently had a kitchen/living room ceiling skimmed over new boards. Hairline cracks have started appearing along the board joints, one nearly the full length of the room and one along the end of a board. The 12.5mm boards were staggered, well fixed and noggins around the perimeter of every board. Have only been painting upstairs since plastered, so no heavy loads. Cracks have only appeared since painting started. Joists are good sized posi joists at 400 centres. No heating on yet and plaster dried by natural ventilation over a good amount of time. Any ideas on why this might be happening and will filling last as traffic upstairs increases?

Thanks

G
 
boards can expand and contract especially this time of year when they can get cold and damp
where were the boards stored before installation and finishing?
 
Gazry said:
Is a gap still essential if noggins are used? Boards should be locked in unless the ceiling is flexing downwards and breaking the joint? I’m just guessing here
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No there shouldn't be a gap, boards should be lightly butted.
Don't listen to Monkeynuts, he's still living in the 70's.
 
What’s the chances the joint wasn’t taped? Was the last room to be skimmed at the end of a long week. Has anyone every cone across cases where scrim was missed by accident?
 
Gazry said:
What’s the chances the joint wasn’t taped? Was the last room to be skimmed at the end of a long week. Has anyone every cone across cases where scrim was missed by accident?
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Scrim only reinforces the joins but won’t stop it cracking. Paper tape allows the boards to move behind it so the cracks rarely show on the face
 
Gazry said:
What’s the chances the joint wasn’t taped? Was the last room to be skimmed at the end of a long week. Has anyone every cone across cases where scrim was missed by accident?
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You might have a miss by rushing .
You usually pick up that miss @ skim stage .
 
Donzo said:
Oh plasterers live talking about cracks.
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crack GIF
 
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