New Ceiling Cracking Along Joints

[Gazry]

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

 

[000]

@ posi joists are renowned for floor bounce /movement …

 

[Monkey Boy]

No gaps

 

[clone of lurpak]

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?

 

[essexandy]

No gaps

Eh?

 

[Gazry]

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?

Boards were stored inside the house and fitted back in July, so should have been okay.

 

[Gazry]

@ posi joists are renowned for floor bounce /movement …

I have noticed this. Definitely a few drawbacks to using them

 

[Gazry]

No gaps

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

 

[essexandy]

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

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.

 

[The Apprentice]

Plaster and plasterboards are inert, they do not move once they are set. The cracks will be caused be movement in the background or the boards were fixed incorrectly. It certainly sounds like the movement is coming from the joists.

 

[algeeman]

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?

no they don't

it's when the heating is on
when a plot moves

New build lads

 

[Monkey Boy]

Don't listen to Monkeynuts, he's still living in the 70's.

80’s

 

[Gazry]

no they don't

it's when the heating is on
when a plot moves

New build lads

House has had plenty of time to dry and settle as I keep running out of cash ‍

 

[Gazry]

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?

 

[paulf]

1880’s

 

[The Apprentice]

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?

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

 

[Cockney]

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

Go to bed.

 

[000]

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?

You might have a miss by rushing .
You usually pick up that miss @ skim stage .

 

[The Apprentice]

Go to bed.

Good morning

 

[clone of lurpak]

no they don't

it's when the heating is on
when a plot moves

New build lads

yes they do.....boards can swell a bit if they get cold/damp........you site slags know fk all

 

[Donzo]

Oh plasterers love talking about cracks.

 

[Cockney]

Oh plasterers live talking about cracks.

 

[MIXERMAN]

Lady up the road has a nasty 4" crack up her back passage. Not sure what to fill it with.

 

[Cockney]

Lady up the road has a nasty 4" crack up her back passage. Not sure what to fill it with.

 

[Stewie03]

Lady up the road has a nasty 4" crack up her back passage. Not sure what to fill it with.

f**k**g spunk mate BOSH