Full Metal Bracket: sheet rock mounting?
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Joined: Feb 2004
Posts: 25
hobbyist
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OP
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Joined: Feb 2004
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I have the following problem: the spaces where each of my (soon to arrive) M22ti's go is between a built-in cabinet and a window. The space is about 16", and there is no stud in the wall.
I'd like to mount the M22's with the Full Metal Bracket. Ideally, I'd just put in hefty sheetrock mounts and be done. But the 16lb weight of the M22's out on a 2.5" lever arm (the full metal bracket) worries me. I'm afraid the torsional load might result in ripping a big chunk out of the sheetrock. Has anyone else encountered this problem?
One possible solution would be to put a 16x3" piece of maple (matches the builtin) on the wall vertically so that it would hide behind the speaker. I would mount the bracket to that. If I remember my freshman-year engineering statics correctly, that would do a much better job of reducing the torsional load on the sheetrock. And, from what I've read on the web, sheetrock can easily hold a 16lb load directly--especially with 3-4 screws.
Advice? Experiences?
thanks,
Robert
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: Dec 2003
Posts: 10,420
shareholder in the making
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shareholder in the making
Joined: Dec 2003
Posts: 10,420 |
I would mount the maple piece first. As you had noted sheetrock can with stand quite a bit of load. A couple of the newer self tapping drywall anchors would work, they come in large enough capacities, but the maple strip behind the speaker would also be a nice touch.
Jason M80 v2 VP160 v3 QS8 v2 PB13 Ultra Denon 3808 Samsung 85" Q70
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: Apr 2003
Posts: 5,236
axiomite
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axiomite
Joined: Apr 2003
Posts: 5,236 |
Drywall anchors will not work. I tried using them when mounting a pair of M2i's and they pulled right out.
They work fine when mounting the bracket for the QS8's, but that's because there are 5 mounting points and the QS8's hug the wall very, very closely.
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: Jun 2003
Posts: 8,488
axiomite
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axiomite
Joined: Jun 2003
Posts: 8,488 |
Sounds like you've got it engineered right to me. If you just use the FMB, I would think you'd end up with quite a dent in the drywall, at least. If it were me, I'd do as you suggested and mount the wood pieces first to spread the load over a wider area. Should look nice, too. Post pictures when you're done!
bibere usque ad hilaritatem
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: May 2003
Posts: 16
frequent flier
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frequent flier
Joined: May 2003
Posts: 16 |
For optimal support I would suggest a stilt, similar to the kind that hold up tilt up walls in new construction. To do this you'll need to angle a 2x4 45 degrees down and away from the bottom of your speaker and onto the floor. In order to keep the stilt in place you'll need 6" piece of 2x4 to use as a stop that will be nailed at the foot of the stilt using 2" concrete nails. (to avoid excess work, predrill some holes in the floor, don't worry about carpet, it won't hurt most drill bits). Now ideally, you'd want to break out the foundation where the stop will be and pour a 1'x1'x1' footing with anchor bolts comming out of the concrete, but that might be over kill, unless you decide to upgrade to bigger speakers in the future. Now, if your not married, then congradulations, you're done!! If you are married, you can extend your marrage by about a month or two if you paint the stilt a color that matches or accents your wall. That's it. I'm glad I could help!
Grass grows green when manuer is placed upon it.
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: Sep 2002
Posts: 186
veteran
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veteran
Joined: Sep 2002
Posts: 186 |
How are you at patching drywall, you could cut a square out of the dry wall insert a piece of wood in behind a section of 1x6 about 12-16" long would do fine. The 1x6 is also used as the backer to screw your cut out piece of dry wall back in, fill the holes some paint and you now have wood and a good load bearing surface to attach the FMB too.
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: Feb 2004
Posts: 25
hobbyist
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OP
hobbyist
Joined: Feb 2004
Posts: 25 |
Are the 18lb JBLs you describe out a bit from the wall on the brackets? My primary concern is that with the speaker's center of gravity out another 4-5", the torque on the FMB will be pretty significant.
I'm not experienced with drywall repair, and we just had the inside of the house painted this week! (After I drilled the holes for the surround speakers.) The only other option is the strip of maple mentioned above, but it seems rather permanent.
Robert
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: Dec 2003
Posts: 273
local
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local
Joined: Dec 2003
Posts: 273 |
I encountered a similar situation when mounting my VP150 with FMB to sheet rock with no stud. In theory some compression-spreader-type dry wall anchors (aka hollow wall anchors) will hold it. However this varies depending on dry wall thickness, distance from stud, and probably environmental factors like humidity. Also the heavier-duty anchors may not be compatible with FMB -- screw diameter may be too large for the FMB screw holes.
Make sure you don't use a simple plastic expansion anchor. Use some type of spreader anchor (toggle bolt, molly, etc) that expands behind the dry wall. For details see http://www.naturalhandyman.com/iip/infanchor/infanchor.shtm
My HDTV was beneath the VP150, so I decided not to risk it. My options were concealing a board behind the VP150 that spanned to the closest studs, then mount the VP150 to the board, or shifting the entire speaker, TV, etc. to the right 8" to hit the stud (which I ultimately did).
In your case you can't move L/R. While the right type of hollow wall anchor could probably hold an M22 via FMB, in general I'd suggest using a board behind the speaker to distribute the load, as you described. I'd still use spreader type hollow wall anchors to hold the board. It's better safe than sorry in situations like this.
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Re: Full Metal Bracket: sheet rock mounting?
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Joined: Feb 2004
Posts: 25
hobbyist
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OP
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Great link, thanks!
I already bought toggle bolts, I've just been debating on adding the board. It's certainly the safest thing to do. Since we have 16-month-old twins (boys, no less), I think that I'll go for safety over wall preservation. I imagine the FMB with toggles would likely hold, but not with the weight of a toddler attemping pull-ups on it...
Robert
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