Originally Posted by BIGmouthinDC /t/1527088/stage-question-final-construction-sand#post_24600921
Frankly I'd rip it out and start over, it is that bad. I doubt it is glued so tight a crowbar couldn't get the job done before the first coffee break. For one thing lets assume at some point you want to convert the room to another use, the wall is sitting on the stage? no way.
Originally Posted by BIGmouthinDC /t/1527088/stage-question-final-construction-sand#post_24603296
I would, that may not be tall enough anyway. Risers should have at least two layers of 3/4 decking (keep it quiet) and be filled with insulation. Built on roofing felt of course. unless those were Pressure treated sleepers.
Originally Posted by smiddleton5401 /t/1527088/stage-question-final-construction-sand/0_40#post_24603321
I'm limited to the height of the platform coming off the steps leading into the theater from the other hallway.
Originally Posted by BIGmouthinDC /t/1527088/stage-question-final-construction-sand#post_24603350
Make it a two level riser, the entrance level and the seating area, use step lights if you plan on having guests.
I'd have to see the entrance maybe you could step up to the final level outside the theater first
3. 4 or 6 mil plastic in cavity and fill the the top with dry play sand.
Q. is the weight of the sand what actually keeps the floor in place in lieu of attaching it to the concrete?
More importantly it makes stage accoustically dead - no/little resonance from stage. But yes, my 12' x 4' x 6" stage has nearly half a ton of sand in it and it inst going anywhere. My stage is not that large.
Be sure your subwoofer(s) is (are) very firmly anchored to the platform.