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It was the prospect of glueing up my walls that led me to abandoning all ideas of foam. I bought Gik panels, and I hang them just as I would a mirror or a picture frame. Some airspace behind them helps them absorb bass.
Do the following test if you have the chance. Turn on a fan or any other source of white noise on one side of the room. On the other, prop up or mount a GIK panel or other mineral wool panel, and on top of it, prop up your favorite foam thing. Wearing well-isolated headphones, take a directional mic and point it close to the untreated wall, so you can hear the white noise bouncing off the wall. Now wave it over the foam. A loss of high-end, right? But little on the low end, and not very even. Now wave it over the Gik panel.
Combine those two effects, then compare the actual price of treatment. You will come to realize that the only reason all those places carry the foam is that it's so light to ship. It's a complete, utter ripoff if you actually want broadband acoustical treatment. The Gik panels are so cheap and effective and easy to work with they make an absolute mockery of the foam crap. And if you have the dough and want the best construction, go with Real Traps.
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