15th Jan 2023, 02:07 PM
For back blocking, the CSR Red Book instructs that the back of the plaster back block should be covered in cement using a 6mm notched trowel - with the 6mm beads at 20mm centres.
QUERY: Is a notched trowel really necessary? If so, I’ll buy one.
(History: This is a follow up to a question I posted in 2021 about back blocking a celing crack that appears at the edge of an 80s extension where two plaster sheets were butt-joined - but not on a framing member....