Sliding glass doors

Hello, First post here and just wanted to say this is an amazing site! I've learned SO much more than I could have from just the books on studio building. Thanks to all who've participated here. I did read the 'before you post' section, so if I leave anything out, please let me know. The studio I'm building is located in Houston, Texas and we're wrapping up the design phase. My question is in regards to sliding glass doors for isolation rooms. There will be two isolation rooms towards the far end of the live tracking room. Both of these will have isolated slabs and double stud/double dry wall construction based on Rod Gervais' book. I was considering using two sets of sliding glass doors for the entry to each room, one on the outer wall and one on the inner wall. I did a lot of research and it seems this is one of those ambiguous areas of discussion. On the one hand, dual sliding glass doors creates a 4 leaf system. On the other hand, I remember reading that the small airspace in between the panes of glass on each door is negligible and so the two sets of doors will in fact act like a 2 leaf system. So, to avoid the former I found a company that can custom make sliding glass doors with a single piece of either 3/4" or 9/16" laminated glass. My idea was to use both different thicknesses, one on the outside wall and one on the inside, to create a true two leaf system. This would also be similar to a control room window construction. The cost however is about 2X as much as using regular sliding glass doors, although the budget does allow for it. If I went this route, will it be a significant improvement over regular dual pane sliding glass doors, or is it just a waste of money? Thanks in advance.

surely a sliding glass door is a two pane door only when it's open. The way the door seals is the important factor IMO Here's a plan of the doors I used in Recording Oasis Studio. You may wish to consider opening doors instead of sliders - I often use them for larger drum rooms as it allows you to wheel in a piano if you require good isolation for the piano. could you please fill in your location in your profile as per forum rules.

John, Thanks for the input, the opening doors idea sounds like a good one. Any words of advice on how to get it to seal properly? I'm not very good with technical diagrams, but I'll show your drawing to the contractor. Regarding the sliders, the doors here in the U.S. all come standard with two thin double panes of glass in each door... is it different in Australia?

well it depends - I'd search for a door company that supplies high rise apartment doors. I know on the coast here the doors that face the ocean from the 20th floor are very sturdy and seal very well - as they should :) It's possible to order doors with different glass.