D
Deleted member 32554
Guest
OK , I was going to suggest a possible solution bit your not going to like itYes.
Check crack for opening with a plump human stomping around upstairs , get your customer to witness crack opening so they know the score
Locate joists along the filler area and get more screws in ( every 4 " )
PVA all the recessed area , wet coat , leave to dry 1 hr
Mix filler with PVA and first coat
Stick tape in and cover to level off hole
When fully dried use filler as a surface coat to blend whole area
Ring the tech line and confess