QUESTION RE: Glass for TR and CR

Hi! Im currently building a small recording studio for dubbing. Im now in the process of purchasing glass for the Control room and Tracking room view. My sound engineer friend recommends that i use 15mm(CR) and 19mm(TR) laminated glass, but the only available thickness here is 12mm :roll: . My question is- would 12mm suffice? and should I use 12mm for both sides or 12mm(TR) then 10mm(CR) combo. The size of the glass is 3ft by 3.5ft only. The TR is only 12sq. meter and the CR is 18sq. meters. Thanks a lot in advance! :D Sol

First, read the forum rules and put your location. Second, 12 mm and 10 mm is what i Have, and I don't have any isolation issues or whatsoever, as long as you have a decent AIR GAP between them and it is a 2 leaf, decoupled building.