Originally Posted by steveosevo
Do you have any more progress pictures? I have a room very similar to yours and i'm curious to see what your going to work on next and the final project.
The lack of progress on the theater is really quite stunning. Summer time is outdoor project time in Michigan, so there has been landscaping to do, and deck rails to finish. Throw in some grad school and a vacation or two, and there goes any chance to work on the theater.
But some stuff has been accomplished.
When last I posted, I had been mudding / taping the drywall seams. The drywall is (thankfully) completed. I sanded the room a little bit, just to knock down outrageously high spots on the wall. The slanted side walls are going to be covered with a paintable, heavily textured wallpaper (looks like ceiling tiles) so I wanted those to be relatively smooth. The rest of the wall I just smoothed enough that fastening panels to it wouldn't result in crooked walls due to high spots in the mud. I primed the walls with two coats of new construction / bare drywall primer without cleaning the walls, so the drywall dust settled into the paint. I don't think I have a picture of just the empty room having been painted.
Then I set out to construct the HVAC return air duct at the back of the room. The supply registers are in the floor towards the front of the room. There are three 4x10 supply registers, for a total of 120 square inches of HVAC supply.
I constructed two return air plenums out of 1 rigid fiberglass panel. The plenums are 12 inches wide by 8 inches high, making the interior 10x6, or 60 square inches. With two of them, that gives me 120 square inches of return air to match the 120 square inches of supply.
The two fiberglass boxes are both L-shaped so that air will have to make a 90-degree turn to exit the room. I hope this will help baffle some of the noise both entering and leaving the room. I haven't cut the register slots in the fiberglass, but they will be on the underside of the box, so the air actually has to make two turns to leave the room.
The ducts are strapped to the ceiling with duct hanger. There is also a 1 spacer of fiberglass between the box and the ceiling because of the way I constructed the rear wall. There is a 2x6 along the original ceiling. Then there is 5/8 of drywall (second layer) on the ceiling inside of the theater, so the 2x6 protrudes 7/8 down the rear wall when viewed from inside the theater. I spaced the duct down an inch so I wouldn't have to cut the 2x6 just to get the fiberglass duct through the wall.
Then the penetration was sealed with acoustical caulk all the way around.