#1647483 - 04/06/04 09:08 PM
Rigidity of OC 705
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MurMan
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Registered: 11/17/03
Posts: 370
Loc: San Diego
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This forum has given me some great ideas about improving the acoustics of a large multi-purpose room at my church.
I'm putting a plan together that uses several hundred panels of 3" OC 705 on the ceiling and walls. Because of the scope of the project, I need to simplify construction of the panels as much as possible. My current thinking (based on ideas discussed in other threads) is to cover the panels with muslin using spray adhesive.
The ceiling panels would be nailed to the exposed rafters (the ceiling is high and very industrial looking with exposed utilities) and the wall panels would mount on furring strips to get them several inches away from the surface.
Here are my questions:
1. Is 705 rigid enough to support itself and the muslin?
2. How many nails per sheet will I need?
3. Will I need some kind of washer on the ceiling panel nails?
4. Is there a better way?
thanks,
Murray
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#1647484 - 04/07/04 01:40 PM
Re: Rigidity of OC 705
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Tim Mayock
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Registered: 08/13/02
Posts: 195
Loc: Granby Ct.
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Murray,
Yes I think it is rigid enough, but I dont know how many nails for 3".
I just did a ceiling with 2" 705-frk and muslin fabric. Frk is a foil surface. I used 3m spray mount on the foil and it left a stain that could be seen through the fabric. I did some without the foil and it looked better. I think it might be possible to paint the foil and not use fabric at all.
I used a suspended ceiling frame to float the fiberglass. I dropped it 4 inches off the ceiling. This worked really well and the sound is really good. I did cut all the fiberglass so it was 23 3/4" x 47 3/4" this help to make it fit into the frame.
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#1647485 - 04/07/04 02:25 PM
Re: Rigidity of OC 705
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Bill@Welcome Home Studios
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Registered: 08/23/03
Posts: 7343
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"1. Is 705 rigid enough to support itself and the muslin?"
The muslin stiffens it even more.
"2. How many nails per sheet will I need?"
I would not use nails to hold anything to a ceiling. Screws, minimum. More on this below.
"4. Is there a better way?"
I think so. A couple of low cost options come to mind.
I would either be framing the 70n in place, mounting the 70n to some solid panels and mounting them, or perhaps hanging a 2x4 ceiling grid (standard drop ceiling stuff...)buying the 70n with a surface (there are options, one of which looks like regular ceilng tile), triming the 70n to fit and simply dropping them in place. This will probably make your liability insurance company happier than other mounting methods.
I wrapped my 703 with muslin (using Spray 77), and glued it into trays that I made from 1x and lauan. I prepainted the trays. I glued (using construction adhesive) the 703 to the 1/4" lauan, and screwed through the 1x framing to hold the panels to the ceiling. A little spackle, a little touch up paint, done deal. But labor intensive and not practical for hundreds of panels. For your purposes, the drop ceiling idea might be faster, easier, and more practical.
Bill
_________________________
"...it's easier than hitting the kids, and almost as much fun..."
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#1647486 - 04/07/04 05:33 PM
Re: Rigidity of OC 705
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Tim Mayock
Senior Member
Registered: 08/13/02
Posts: 195
Loc: Granby Ct.
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Murray,
I want to also advise you wear protective eyeware, gloves, a mask and a longsleeve shirt.
the itch of this stuff is similar to poision ivy.
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#1647487 - 04/07/04 06:18 PM
Re: Rigidity of OC 705
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MurMan
Senior Member
Registered: 11/17/03
Posts: 370
Loc: San Diego
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Tim, Bill:
Thanks for the good advice. Much appreciated.
I like the drop ceiling approach. The ceiling follows the roof line and is peaked. I could create and hang horizontal panels of 2X2 grids (4' X 8') and step them up as the ceiling goes up. In addition to the acoustical properties, it would create an interesting ceiling and hide all the ducts and sprinkler plumbing.
Originally posted by bpark@prorec.com:
...buying the 70n with a surface (there are options, one of which looks like regular ceilng tile), ...
Now that the ceiling plan is coming together, there are the walls. Any comments on the idea of mounting 705 to furring strips? The big question is do I need to frame them. This would add a lot of work. Any way to crate drop ceiling grids and mount them vertically?
thanks,
Murray
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#1647488 - 04/07/04 06:28 PM
Re: Rigidity of OC 705
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Bill@Welcome Home Studios
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Registered: 08/23/03
Posts: 7343
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Murray,
The ceiling tile grids can be run at an angle (within limits), so you could make longer runs that preserve the sense of angle going up, rather than stair-stepping the ceiling.
I don't know the OC line, so I don't know exactly what the OC faced would be called. Maybe OC doesn't make it, but Knauf does, so I imagine that OC does, too.
If you need to treat the walls, maybe panle traps would be the answer? Otherwise, you can mount the 70n to the walls using screws and fender washers, inside of frames. Then stretch cloth over the frame faces, staple in place, and add trim strips.
Bill
_________________________
"...it's easier than hitting the kids, and almost as much fun..."
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