[Ed B. 1979]

Hi, I'm constructing a room that will use RSIC clips on the ceilings and walls. I'm leaning towards a used BARCO 1208 CRT Projector, this thing is pretty heavy and I was told that I'll need to secure a 3' x 3' 3/4" thick piece of plywood to the ceiling as a mounting plate. The plan would be to drywll over this, however RSIC would seem to pose a problem for this plan.


How did you guys who used RSIC and ceiling based CRTs construct your mounts?

 

[Ed B. 1979]

No responses yet....


All I can think of is to put a whole bunch of RSIC clips underneath the 3 x 3 piece of plywood and hope that hold the projector up!!!

 

[bpape]

I have no idea what kind of load rating is associated with the clips or the hat channel. Sorry.

 

[Ed B. 1979]

It's 36 lbs per clip in a regular 2 row config I think it goes a bit higher when you add a couple of more rows. I'm sure somebody has done a successfull RSIC setup with a CRT!


Just need to figure this out because I wouldn't want something like the projector mount to ruin a couple thousand dollars of sound isolation.

 

[Art Sonneborn]

Better to ask on the CRT forum I think.


Art

 

[ChrisWiggles]

What art said. I am construction incompetent. But I feel I overkilled my mount by bolting 3 pieces of unistrut to 2x4s, which are then bolted 4 times each through 2x10 floor joists. We hung people off each one and nothing moved at all, so my 808 is definitely not gonna come down, the house would collapse around it before it ever fell...

 

[Ed B. 1979]

lol yup that sounds like overkill but theres nothing worse than a 150lbs projector falling on your head!!


I think I've come up with a plan that will work and add a ton of strength more than just RSIC while maintaining sound isolation. Will post plans if I can draw them up on the computer.

 

[E. Martin]

This is what I was told to do when I was considering the RSIC clips and my XG852.


Make sure you have at least three rows of the RSIC / hat channel closely spaced (so that all three would be in the "foot print" of your PJ. They do not all have to be the width of the room, just so they span several joists.


You can then sheet rock as you would. Now, using your PJ as a template, cut a piece of 3/4 to 1" board, the shape of your PJ. Pre mount the PJ mount on the board and then secure the board to the ceiling (ensure you have the screen to mount distance correct as well as having it centered and not off skew.


Once that is attached to ALL THREE or FOUR rows of the channel (with multiple screws) you may mount your PJ to the pre-hung PJ mount.


They will carry the load just fine.



All that said, I am now moving away from he RSIC and using the new Green Glue as an alternative. More cost effective and I can mount the PJ to wood. I just feel more comfortable that way. Paranoid!

 

[Ed B. 1979]

I was thinking of something similar, 4 rows of RSIC but also above the rsic layer I'm thinking of putting a wooden plate (with and acoustik mat backing) that is secured directly to additional joists. This plate would be equipped with a few long bolts that would go through the air cavity and into my 3 x 3 chunk of plywood that is mounted on the furrows. Nuts on the bolts would then be tightened up but the air cavity between walls would remain in tact.


Of course sound could vibrate through this bolts however that loss of souond proofing should be fairly insignificant. I'm only talking about maybe 5 bolts.