Get a bag of 'bonding' to stick to board to brick. Mix it fairly stiff, but not too stiff. It should stick to the brick when flicked onto it, but should have enough 'give' to press your boards home.
The plasterboard will have written on it which side to face which way.
I prefer to use scrim, once you've got the hang of it it's really quick to do.
for example if you are doing ceilings get a paint brush dab the adhesive onto the brush and make one stroke onto the scrim whilst holding it on the ceiling.
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