I want to attach a wall, of 7-9.2cm thickness, on ceiling and floor. Drywall with wood frame done for living apartment in a block of flat: 42mm x 66mm woods form the wood frame where 13mm drywalls attached on both sides. Some wood frames are 70mm thick while others 92mm.
Recommedations conflict for fasteners: 120mm fine, 120mm too long, 100mm good -- not wanting fastener to go into neighbour side in a block of flat. The fasteners are needed to be attached to the floor and ceiling. The floor and ceiling are concrete.
How to determine the minimum length for a concrete fastener to build a wall?