Lets hope you guys read building plans better than posts on here, it was 300 Deep 500 H shoulda gone to specsavers lads ! hah, hah, and yes it seems excessive but up to CURRENT Building Reg Requirements, I'm sorry if this has been confusing for you and I have no doubt you have been building for years and have a wealth of experience BUT BC regs are there for a reason and correct building practice must be adhered to otherwise we'll all end up on Rogue Builders !! The main thing we must agree on is this is a sloppy job and he should seek professional advice before continuing.- Jackie