Q: DIY Unistrut Mount - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 10 Old 04-16-2002, 08:59 AM - Thread Starter
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Hello All,
I am in the process of mounting my Barco Graphics 1200 in my basement with 8 ft ceilings.
I would greatly appreciate any input on the following questions:
1. What gauge of unistrut is recommended for mounting BG 1200, which weighs about 170 lbs? Home depot here in St. Louis, MO has 12 and 14 gauge unistrut.
2. Which of the following size should I use?
height: 5/8 or 1 5/8

Thanks in advance
Adarsh
LL
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post #2 of 10 Old 04-16-2002, 10:45 AM
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We use unistrut all the time to mount barcos. If the drop from the ceiling to the CRT is less than 12" we use 3/8" threaded rod, which means 3/8" captive nuts, which means the smaller unistrut. If you want to go with 1/2" threaded rod, then you have to go with the deeper unistrut as the 1/2" captive nuts won't fit in the shallow unistrut.
So here is what I do if I have ceiling joists I can lag into:
Lag unistrut into 3 ceiling joists to spread the load w. 3/8" x 3" lag bolts.
I use the mounting tabs on the barco for and aft and they alreaddy have holes drilled. So the line up from the unistrut down is 3/8" captive nut w/ 3/8" threaded rod in it, washer and nut to loc the threaded rod into the captive nut, and then a washer and nut on each side of the barco mounting tabs.

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post #3 of 10 Old 04-16-2002, 11:42 AM - Thread Starter
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Thanks Terry!
What ga unistrut do you guys use? I have seen 12 ga and 14 ga unistrut.
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post #4 of 10 Old 04-16-2002, 12:08 PM
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I am nor sure of the gauge. At our HD here, they have what I call thin channel and deep channel (like what you showed in your picture). We use the thin for the 3/8" threaded rod and the deep for the 1/2" rod.

Terry

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post #5 of 10 Old 04-17-2002, 11:26 AM - Thread Starter
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How long should the unistrut pieces going along the floor joist?
I am thinking of 4 ft long unistrut pieces going along the floor joist, bolted to the floor joist using the unistrut 'L' brackets. Two 2ft unistrut pieces bolted to the projector. And then using 3/8" thread rod to connect the projector to the ceiling unistrut pieces.
Any input will be highly appreciated.
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post #6 of 10 Old 04-17-2002, 12:57 PM
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Adarsh...just a word of caution (but you may not be able to do anything about it). If you secure the Unistrut to the above floor joists, when someone walks in the room above, it will "bounce" the projector...depending upon how sturdy the above floor, it can range from a minor blip to a very noticeable jiggle (sorry for all the technical terms :)). I think the only true way to get around this is to build a floating ceiling in your HT, which most people can't do. This holds true for any ceiling mount--Unistrut as well. I had this problem with my last theater and it really bugged me!

Alex doesn't live here anymore
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post #7 of 10 Old 04-17-2002, 01:12 PM
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If i may jump in here with an install question,

i would like to install my NEC 6PG using unistrut,however my installation is a bit different,(see picture)

http://www.imagestation.com/picture/...c/fdf7c5c7.jpg

using the basic NEC mounting plate and bracket...

my plan is to lay the Unistrut over 3 rafters 5`or so...(rafters 24"on center)

then with <4> rods from the mounting plate up and through the Unistrut..

will this work????iv never seen this mounting procedure before,so i want to make sure i understand the workings of Unistrut..

thanks-

Tommy

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post #8 of 10 Old 04-17-2002, 08:20 PM
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Tommy,

This is essentially what I have done. The only difference is that I have almost a foot between my drop ceiling and ceiling joists. Plus my Unistrut is bolted to the bottom of my joists and you will be bolting yours from the top. Here's a pic of my Unistrut installation...

http://personal.atl.bellsouth.net/at...orn/mount1.jpg
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post #9 of 10 Old 04-19-2002, 07:29 PM
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Do not use the small unistrut for the nearly 300 pound BG1200 over any distance of more than three feet, as you will get near the engineering spec limit of weight. I have the book and calculated the weight limits.

I don't recommend bolting such a heavy weight into the bottom of the joists, as it may come out at an inopportune time, esp if someday the joists are rain weakened etc.

I bolted my unistrut into the side of the joists. You can do better by putting your unistrut on top of the joists.

I then used the unistrut 90 degree angles to make a support beam.

Look at this thread: Here

Look Here: http://members.aol.com/jinnyjinny/picture1/

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post #10 of 10 Old 04-20-2002, 04:45 AM
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Mercury,
I don't like the idea of Unistrut tied to ceiling joists that are 24"OC. Would rather see 16" OC considering the ceiling joists are 2 x 4's. If I were you I'd consider beefing up the structure above the ceiling.

DMAN, that is exactly how we do it on Sonys and NEC's. Neat install, On Barcos since they have the mounting tabs, we don't need the Barco ceiling mount and just run the threaded rod into the mounting tabs on the bottom the the pj. You need to come over and help me figure out how I'm gonna get this BG1209 up without cutting into my tray ceiling.

Terry

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