We are looking to get our 4x4.5m kitchen re-boarded and skimmed. We have had a local chap in to look at it, with a laser theodolite thing and he has advised that - as the joists are not all exactly level - there is around 1-1.5cm variance between shortest and tallest - installing sister joists running along side the ordinals need to be installed; so providing that flat and level surface before be would plasterboard and skim.
The previous ceiling was 9mm plasterboard and to the eye had no undulation due to the uneven joists.
What is the normal tolerance for boarding out with 12mm before it gets into impractical levels of skim etc ?
Is he being over zealous in his accuracy ?
Thanks in advance
The previous ceiling was 9mm plasterboard and to the eye had no undulation due to the uneven joists.
What is the normal tolerance for boarding out with 12mm before it gets into impractical levels of skim etc ?
Is he being over zealous in his accuracy ?
Thanks in advance