Room Treatment-Overhead joists

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RobertB
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2008/05/17 21:59:15 (permalink)

Room Treatment-Overhead joists

I was tempted to interupt Daves' room treatment thread with this, but thought better of it.
I am set up in a basement, with a concrete floor, and open TJI joists above. I know I have reflections from the bottom side of the floor above, but I have to wonder what effect those joists have.
Could they possibly have some beneficial trapping effect?

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Shimozu-Kushiari or Bob
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    DW_Mike
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    RE: Room Treatment-Overhead joists 2008/05/17 22:07:30 (permalink)
    From what I've read it seems that open joists is not a bad thing. Maybe not to good for keeping the sound from the rest of the house but better for the mixing enviroment.

    Mike
    post edited by chefmike8888 - 2008/05/17 22:28:52

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    droddey
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    RE: Room Treatment-Overhead joists 2008/05/17 22:35:31 (permalink)
    Stuff them full of 703 and that would make for a very nice 'cloud' for the top. Use a little chicken wire and staples to hold it up there.

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    Rbh
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    RE: Room Treatment-Overhead joists 2008/05/17 22:45:09 (permalink)
    If you do stuff the cavities or hang a ceiling... make sure your heat and AC are set up to accomodate the seperation. It's best if you zone it seperately from the upstairs.

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    Dave Modisette
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    RE: Room Treatment-Overhead joists 2008/05/17 23:01:20 (permalink)
    Might consider stuffing the gaps with 703 and/or 705 and then nailing a series of planks across it. Cover the glass with some polyester batting and then vary the width and gap between the planks and get a Helholtz resonator effect.

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    wst3
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    RE: Room Treatment-Overhead joists 2008/05/18 08:06:52 (permalink)
    You need to figure out where your problem lies (if, in fact a problem exists) - do you need to treat the boundary for isolation or the ceiling for acoustical behavior?

    You can even do both<G>, but of course it involves a compromise<G>!

    Bill

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    bitflipper
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    RE: Room Treatment-Overhead joists 2008/05/18 12:40:00 (permalink)
    The best thing to do about joists is fill them in with absorbent material, as suggested above. However, I would not use 703/705. Use regular pink fluffy insulation. It's cheaper but actually more effective than compressed fiberglass - if you have the depth to use it, such as between floor joists.


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    RobertB
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    RE: Room Treatment-Overhead joists 2008/05/18 13:19:33 (permalink)
    Thanks guys,
    I've been following Dean's project, and others, with interest. I am in the process of finishing my room, and from what I've seen, a lot of problems come from hard, flat surfaces, and room size.
    (if, in fact a problem exists)

    Bill (wst3), I think that is a very good question. it seems that, as Mike has suggested, the open chambers may actually be beneficial, and I could create a problem by finishing the ceiling in a conventional manner. Isolation isn't so much an issue, as I have plenty of time when no one else is home. It would mostly be for acoustical behavior.
    Everybody seems to be fundamentally in agreement.
    Dave (bitflipper), you answered my next question. These are 11-7/8" joists, so plenty of room.
    Dave (Mod Bod), I'm not familiar with the Helmholz resonator. I looked it up, and it seems that the idea would be to keep the room from becoming too dead?


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    droddey
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    RE: Room Treatment-Overhead joists 2008/05/18 13:30:31 (permalink)
    Oh, yeh, I didn't realize they were that deep. It would be beaucoup expensive to fill all that space with 703.

    Dean Roddey
    Chairman/CTO, Charmed Quark Systems
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