window in my vocal booth... glass?

Hello again... I need to put a window in my vocal booth (and also in my control room looking into the live/drumroom) - should I go with normal double glass ? I was thinking of getting "sound-dampening" glass like they use in houses near freeways, I can get that for a reasonable price from a local factory. Would that work ok, or should I go with plexiglass instead? Any advise and suggestions greatly appreciated!! :wink: Thanks!

i belive laminate gass is what you need. the thicker the better if isiolation is the concern.