Plaster splitting

[Nick Moore]

Hi assume you're using modern to modern plasterboard?

if not..

I heard an old plasterer on ABC radio handyman show.. recently

Was describing plaster cracks reappearing on amateur old house repairs..

His point was that modern plasters / patch material being stronger than old plaster cause the cracks. ..flex at difft rates to base sheeting.

For old house plaster have to mix base filler using old fashioned type formula (like brickies mortar style)

Also have to really vee out crack to give wide sface area to bond to..
(Think he said you also had to keep wet with spraypak water bottle.?)

The old style mix Is a more flexible base you can then overcover with modern spakfilla etc ok.

As I said above relates to old plaster patching..Renovation type repairs.

Definitely flexing points need wood backing blocks or light plasterers angle .
Modern houses are flimsy in build these days compared to old wooden houses. Like the all hwood frames here in Tassie old houses..

[Andrew in Tas]

Hi Tiger,

you said you used cornice cement for the joints. Cornice cement is an adhesive that is used for fixing cornice or for fixing plasterboard to masonary. You need to use basecoat and then the premixed topping coat. If the job is only small you could use the premixed total jointing compound.