In this YouTube tutorial about sound proofing the host Refers to 34 mill by 34 mill timbers.
you'll see this framework that runs all the way around up, that's just a soft wood frame attached on to the inside wall. it's 34 mill by 34 mill Timbers which is a fairly standard size, and that just goes all the way round.
Is he talking about a 34 mill by 34 mill timbers?
Given he said that is a standard size, What does “34 mill by 34 mill timbers” refer to ?