Bulk heads vs Flat ceiling - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 15 Old 10-24-2017, 12:19 PM - Thread Starter
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Question Bulk heads vs Flat ceiling

I have two drywalled bulk heads running through my soon-to-be theater room. Which option would be best acoustically, if it matters at all.

1) Leave drywalled bulks. Drop ceiling the remainder of the ceiling. Bulk heads will be 8" lower than the drop.

2) Leave drywalled bulks. Add drop ceiling level with the bulk heads.

3) Remove the drywall from the bulk heads and do a level drop ceiling the entire way.

Thanks
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post #2 of 15 Old 10-24-2017, 02:01 PM
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If you are looking for sound isolation, a drop ceiling will do little or nothing to block sound. It really won't matter what you do with the bulkheads.

If you are concerned about sound reflection reverberations within the room, the bulkheads are probably only a small portion of the room surfaces and likely won't have a significant impact on the overall sound within the room.

What is in the bulkheads? If there are HVAC vents or any kind of exhaust vents, there may be code requirements for fire blocking between what is in the bulkheads and the rest of the room.
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post #3 of 15 Old 10-24-2017, 02:18 PM
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I also would wager you can construct the bulkhead smaller. Typical builder grade runs framing under the obstructions . Instead you can often span the bottom with just drywall. A picture would help.
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post #4 of 15 Old 10-25-2017, 06:50 AM - Thread Starter
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Quote:
Originally Posted by DaveClement View Post
If you are looking for sound isolation, a drop ceiling will do little or nothing to block sound. It really won't matter what you do with the bulkheads.

If you are concerned about sound reflection reverberations within the room, the bulkheads are probably only a small portion of the room surfaces and likely won't have a significant impact on the overall sound within the room.

What is in the bulkheads? If there are HVAC vents or any kind of exhaust vents, there may be code requirements for fire blocking between what is in the bulkheads and the rest of the room.
HVAC. I'm not concerned about sound isolation; more about sound quality... but I should preface that with 'I'm no audiophile'. If its only a slight detriment to sound quality, it probably isn't worth the effort to tear them out.

Thanks.
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post #5 of 15 Old 10-25-2017, 07:04 AM
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I doubt it really matters all that much audio-wise.

You could keep the volume and drop the ceiling, at the same time. I am thinking of this DE design room, that was posted years ago.

A bulkhead, a sloped section of ceiling, and a low ceiling overall, turned into a nice lighting plan, a rather detailed ceiling plus an interesting use of
track lighting hidden by the bulkhead, for the screen washes. The spot lights don't penetrate the room's shell, and that boxed ceiling also has
potential for a wiring chase.
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post #6 of 15 Old 10-25-2017, 07:16 AM
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I also forgot to mention HVAC also in the soffiting solution there.
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post #7 of 15 Old 10-29-2017, 10:12 AM - Thread Starter
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Quote:
Originally Posted by BIGmouthinDC View Post
I also would wager you can construct the bulkhead smaller. Typical builder grade runs framing under the obstructions . Instead you can often span the bottom with just drywall. A picture would help.

Pictures attached. I'm not sure I gain much other than more work. Maybe an inch of height? They only drop 8" as is.

Screen will be going where the big yellow sun is. Haven't decided if I'm going to mount the screen to the wall or go flush with the front of the bulk head and have an AT screen. Just concerned that it shortens the viewing distance from 15' to 13' for the back row.
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post #8 of 15 Old 10-29-2017, 12:59 PM
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You don't know until you peak at what's inside those soffits, and see how they were framed up.

They might very well be framed out in 2x3 or 2x4, and that means more inches could be gained.

Just how close are you putting the front row off of an AT screen?
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post #9 of 15 Old 10-30-2017, 06:31 AM - Thread Starter
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Quote:
Originally Posted by Tedd View Post
You don't know until you peak at what's inside those soffits, and see how they were framed up.

They might very well be framed out in 2x3 or 2x4, and that means more inches could be gained.

Just how close are you putting the front row off of an AT screen?
The ceiling is high enough that I don't need those extras inches in height. The question is whether I go with the two different types of ceiling (drywall & drop) at either the same height (bottom of the bulks) or at different heights (drop ceiling tight to the joists). Or rip the bulk heads out and put a drop ceiling around the duct work.

Rough dimensions pictured below. At best I could stretch the rear row to 14'5"; not sure where that would place the front row.
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post #10 of 15 Old 10-30-2017, 04:57 PM
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The other option is a cloud type ceiling. You could rip, out the bulkheads but I bet there's inches to be had.
You can basically reframe and then drywall. Just leave 1/4" clearance between drywall and whatever is in that bulkhead.

How much height is under those bulkheads? How wide is the space?

The front one is likely an issue at all, but that second might be, because of a riser and where the projector lands.

Another option might be a single row of seats, with an acoustically transparent screen.
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post #11 of 15 Old 10-31-2017, 05:38 AM - Thread Starter
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Quote:
Originally Posted by Tedd View Post
The other option is a cloud type ceiling. You could rip, out the bulkheads but I bet there's inches to be had.
You can basically reframe and then drywall. Just leave 1/4" clearance between drywall and whatever is in that bulkhead.

How much height is under those bulkheads? How wide is the space?

The front one is likely an issue at all, but that second might be, because of a riser and where the projector lands.

Another option might be a single row of seats, with an acoustically transparent screen.
Pretty much null for room. The front one, where screen will sit, is tight to the ducting. Could gain an inch going from 2x4 to 1x3 or something but not worth the effort. The rear one is a support beam which the drywall is flush to. It only comes down 4" or so I'm really not concerned with the height of it; more the aesthetics of having the different ceilings.

Single row of seats only gives me 3 seats as I have about 85" of seating space to work with. A little tight for a family of 4.

What is a cloud ceiling?

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post #12 of 15 Old 10-31-2017, 05:52 PM
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You could fit 4 theater style seats in 85".

A cloud ceiling is basically a hanging frame work that is usually an acoustical treatment, and often it is a style element.

I was asking about height, because of the possibility of a riser, and how that would impact on those doors, and traffic flow, and viewing angles.
To envision a room, you need to think 3D, to consider other design possibilities.
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post #13 of 15 Old 11-01-2017, 12:18 PM - Thread Starter
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Quote:
Originally Posted by Tedd View Post
A cloud ceiling is basically a hanging frame work that is usually an acoustical treatment, and often it is a style element.
Any examples of this and how to build it? Would love to have a look.
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post #14 of 15 Old 11-01-2017, 05:26 PM
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Off the top of my head....

and I expect these two Art Install rooms are, or they easily could be:

http://www.artinstall.ru/en/projects/loft

http://www.artinstall.ru/en/projects/bauhaus
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post #15 of 15 Old 11-02-2017, 07:37 AM - Thread Starter
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Originally Posted by Tedd View Post
Off the top of my head....

and I expect these two Art Install rooms are, or they easily could be:

http://www.artinstall.ru/en/projects/loft

http://www.artinstall.ru/en/projects/bauhaus
Thats a pretty damn good idea. Please check my work...

Build grid (2"x2" wood) with 2'x4' inserts. Attach to floor joists. Add Owen Corning 705, cover with AT fabric. Leave a little gap on the edges for some recessed LEDs.
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