I have done a complete gut and plan on building a hollow wall directly against an exterior wall. The reason I am doing this is that this wall is going to have my tv on it and have all my av gear against it. I want a hollow wall so that I can channel wires/cables and leave future options.
My exterior wall is now insulated and vapour barriered and I had planned on building the wall up against that. A friend of mine came over and suggested that I first drywall the exterior wall so as to further seal it prior to building my hollow interior wall (which will also be drywalled). I do not see the point of this but this is why I am asking here.
I am not looking to do a built in for the gear. I am just doing a 2 x 4 wall right against the exterior wall for channeling wires up and down from the tv...unseen. This also leaves me the option of installing inwalls if I ever decide to do that.