havin a bit of trouble

[S a plastering]

dabbed a couple of jobs recently the stud work is ok but on the walls when dried out gettin very faint cracks down some of the board joints ther has been no heatingon the houses all dried out naturally its rather annoying cant do much more really all we can do is scrim the joints

 

[dustydave]

Have you tried using wider scrim? I always use 4 inch and dont have any problems with cracks.

 

[pwi]

are you dabbing over old studd partitions ?? couldnt this be movement within the stud . i also think tape is crap now of days not like the old sturdy stuff, 4 inch wont really make a difference as long as your centering ur tape

 

[hollybank]

Had the same problem myself as pwi says the tape today is crap,maybe get the jute scrim out.

 

[rockhardsolidplastering]

put fibres in your 1st coat of skim end of problem

 

[rockhardsolidplastering]

Link Removed

here you go now im the copy and paste king

 

[hollybank]

Nice one Rock.

 

[S a plastering]

yes its just seems to be on the dabbed walls on masonary the scrim the companys providing is shite aswell

 

[bubbles65]

What's the walls built with?, are they old walls, brand-new blockwork or what?

 

[rockhardsolidplastering]

to be honeat i only use fibres on re skims it stops them crazy cracking the problem in this thread altho probably would be eliminated with fibres it does seem as tho its a scrim problem.

 

[potatoe]

cracks on plaster board mean movement. prob not enough dabs or no scrim. or just heavy dabs.

 

[potatoe]

oh and scrim is great stuff!!!!! im rough as **** at boarding!!!!

 

[henry]

what is heavy dabs ??

 

[potatoe]

thick

 

[skimmin2day]

If the cracks are on the board joints then it can only be movemet from the boards.Agreed the scrim nowdays isnt the best but must be something you doe whilst putting the boards on
Like suggested you probably
A) Not put enough adhesive on so the boards have moved slightly
B) Put to much adhesive on,so when drying out the boards have slipped very slightly
C) You did not allow enough time for boards set before removing packers under boards and skimming
D) Maybe the boarding wasnt great to start with i.e gaps to big between them ?
E) Are you sure you scrimmed all the joints ?Also bed the scrim in with a tight coat of plaster i beleive this helps to stop the cracks also it gives a visual mark of the joints and makes a missed joint more noticable.I always run a tight coat over scrim on my ceilings,walls also i i have enough to go at.

D)

 

[spunky]

Doubt it's any of the above the Walls even if they moved would have settled by the time it's skimmed

 

[skimmin2day]

Most probably he skimmed em before they had set properly then removed packers

 

[S a plastering]

no mate they were skimmed 2 days after an all the packers are left down for the joiners to move i dont move em these are only very faint lines running down the joints im not really that arsed ive done all i can an thats it

 

[bubbles65]

What's the walls built with?, are they old walls, brand-new blockwork or what?

^^^^

 

[pwi]

were they old plaster walls which you dabbed over i have doubts about just dabbing over plaster walls i always wba (etc) but thats just me

 

[S a plastering]

just brick walls not block they had allready been dabbed over before but we ripped it back to the brickwork an yes all the walls had agood wet down before dabbing

 

[broonster]

Dabs to far from the edge of the boards and while skimming movement (just a thought)

 

[bubbles65]

But everybody dabs up to the edges dont they? I mark a line up at 4ft with a broken board and derby so I know where the board edge will be, but I'm assuming everybody does:RpS_confused:

 

[beddy]

yeah solid band down the edges, makes it solid and easier to tap back

 

[ash]

I think your wright about the movement. But i suspect its not movement in the brick or building etc. He mentioned he wet the walls down first. In my experience water never seals and primes the surface well enough. Too little water and the dust reappears in minutes. Too much and the dabs resist bonding to the wall. Pva walls everytime. I made the mistake once of not sealing wall. Plumber chopped out a few days later for pipes etc, and i noticed a whole area of dab coming away from the wall. To check, hit the walls with the base of your hand to see if the dabs have come away etc.