or Connect
AVS › AVS Forum › Display Devices › LCD Flat Panel Displays › Mounting TV to wall, off center studs need help and advice please
New Posts  All Forums:Forum Nav:

Mounting TV to wall, off center studs need help and advice please

post #1 of 14
Thread Starter 
New to forum. I have read a lot and searched for my answer. Have not found anything very specific. So here goes...

I'm mounting my Samsung 55" (LN55B640) to a tilt swivel mount. I need to center it and the studs are not where I need them. So I'm going to mount a 3/4" plywood across three studs. Lag bolted top and bottom of course. Then I'll mount the mount to the plywood. So far how does this sound?

My questions are this. What size lag bolts to mount to studs? And how to mount to plywood? Thinking 6 1" long lag bolts? The biggest I can fit through the holes on the mount. Thanks so much for help.
post #2 of 14
Thread Starter 
http://www.monoprice.com/products/product.asp?c_id=108&cp_id=10828&cs_id=1082806&p_id=8587&seq=1&format=2

This is the mount.
post #3 of 14
Thread Starter 
Anything guys?
post #4 of 14
that should work just fine. if you're doing a piece of plywood between the two studs and then mounting it to those.... make sure you have some fairly well built plywood, not the cheapest crap at HD. second... I'd put 2-3 Four inch long lag bolts to lock down the plywood on each stud and using 6 of the 2-1/2 inch long lags for locking the mount into the plywood (a bit overkill but believe me it WON'T be coming down. )
post #5 of 14
I'd use a length of 2x12 instead of plywood. Notice that the mounting plate appears to be solid. That means you'll have to counter-bore the lags that attach the 2x12 to the wall so they don't protrude above the surface of the wood. Counter-boring 3/4" plywood for lags/washers leaves very little wood for the washer to bear on.

If you insist on using 3/4" plywood, forget lags and use very stout bugle head stainless steel screws, and counter-sink the heads. That would be amply strong. Nevertheless, you'd have to be careful about the screws attaching the mount to the plywood; 3/4" isn't much for them to get adequate "grip".

Anyway, to continue:

Materials:
- 2x12"
- 1" paddle (spade) bit
- 5/16" drill bit
- 1/4" drill bit
- (6) 5/16" x 4" lag screws with washers
- Socket set or enclosed wrenches of the proper sizes

Start with the 1" paddle bit to do the counter-boring. Mark the locations of the holes about 2 - 2 1/2 inches from top and bottom so as not to interfere with the mounting screws (which are supposedly included). Drill the counter-bores only deep enough so the heads of the lags w/washers do not protrude. Then drill through the center of the counter-bores with a 5/16" drill bit.

Now locate the 2x12 at the proper location and drill a 1/4" hole through the top center counter-bored hole, four inches deep. This hole must be undersized so the lag will have enough "grip". Hence the 1/4" bit. Note that lags are self-tapping, so you could actually dispense with pre-drilling this hole, although it will be a good deal harder to turn them. (Wall studs are commonly soft wood). Get out your socket set or the proper sized closed end wrench for turning the lag. Drive the lag until the 2x12 is starting to get tight to the wall. Level it up and tighten a little more until it's firmly in place. Then do another lag, checking for level. Do the rest of the lags.

Hold up the mounting plate to the 2x12 and mark your first hole. Remember, undersized hole for good grip. Level and tighten. Do the rest of the mounting screws. Dunno what are the sizes of the lags in your mounting hardware kit, but I'd guess 1/4" or 5/16" diameter.

I did the above for mounting my 65" LG. More because I needed the extra clearance to reach my connections, since my mount spanned enough studs. I painted the 2x12 the color of the wall before attaching the mounting plate. BTW, I'm a retired contractor.

Good luck.
Edited by fritzi93 - 11/20/12 at 7:36am
post #6 of 14
Thread Starter 
Thank you so much, exactly what I was looking for. Its a nightmare trying to find a 2x12 thats not warped, knotty etc. at home depot. Might need to try a lumber yard.
post #7 of 14
Use so-called "white wood", i.e. spruce or pine without pronounced knots if possible. Stay away from southern yellow pine; it warps like nobody's business.

Sight along the edge and find one relatively straight, i.e. not "rainbowed" or "crowned". A little bend or deflection right or left is no problem, as you can easily draw that to the wall. Stay away from anything with an obvious twist, although that too can be drawn down flat.

BTW, unless your wall was done with metal studs, it's not perfectly flat either. It's only approximately flat, as good frame carpenters always orient studs "crown up" on one side when framing a wall. If they didn't, you'd see it alright.

Here's the thing: "cupping". Of course you want the flattest possible board across the width, as cupping is hard to draw down. With your mount, I'd put the cup out, facing away from the wall, so the mount can span the cup without being warped, as it would be with cup down (humped out). Ever see what happens when a plywood scrap is thrown onto damp ground? It cups *up* as moisture is absorbed on the bottom and the grain expands.
So mount your 2x12 cup *up* or out and paint the outer face. Draw down your lags tighter within half an hour or so and you can perhaps flatten it out slightly. The closer your lags are to the edge, the better this will work, but you must not get so close to the edge that you weaken the attachment or split the board. And they must not interfere with the placement of the mounting plate lags.

The above assumes you can't get anything perfectly flat, but you should be able to pick one close enough so it doesn't matter.

Good luck.
post #8 of 14
Thread Starter 
It seems all I can find in 2x12 is douglas fir and yellow pine, oh and cyprus. What a pain. I still have a couple lumber yards around to call.
post #9 of 14
Douglas fir would be fine. It's very stable and not prone to warping or cupping.

If it would be easier for you, you could certainly go with *two* layers of 3/4" plywood. Pre-drill your mounting holes through both layers. Lag the first one to the wall. Now expand the drill holes in the other one with your spade bit. Use a backer of scrap so the holes don't tear out and get ragged. This will serve as your counter-bores. Apply construction adhesive or liquid nails to the first sheet, place the other one on top and spread out the adhesive by moving the top piece back and forth a little. Then drive some drywall screws to hold them together until the adhesive sets. You could leave these screws in if you drive them hard enough so the heads are counter-sunk. Then proceed with attaching your mount.
post #10 of 14
Thread Starter 
Fritzi thank you so much, you have really helped me out here. I have two last questions. Is it easy to paint fir? I would assume a couple layers of primer and a couple layers of good paint.

I do like the idea of using two pieces of ply. I can use a router on ply to clean up the edges (or if I use 2x12).

Ok if you had to do it in your house which way would you choose? Based on looked and functionality i.e TV not falling off wall. Lol


Again I REALLY appreciate the advice.
post #11 of 14
If you really want it to look good. cut out a hunk of your drywall and lay the 2x4's horizontal between the studs and bracket them in. then re-drywall over that and attach the mounts to those studs now.
Edited by wormraper - 11/20/12 at 6:33pm
post #12 of 14
Most wall mounts allow you to center the TV by sliding the TV brackets along the length of the wall bracket. How much off centered are your studs? If it's only by a few inches maybe sliding it along the wall bracket until it's centered on the wall will do the trick.

I found this thread researching the same issue. My TV is going above a gas fire place and the studs are about 6" off center. I'm using a Cheetah articulating wall mount and I think sliding the TV along the wall mount by six inches will yield the results I'm looking for.

I'm not looking for a construction project, I just want to mount a damn TV.
post #13 of 14
Thread Starter 
Quote:
Originally Posted by Arsynic View Post

Most wall mounts allow you to center the TV by sliding the TV brackets along the length of the wall bracket. How much off centered are your studs? If it's only by a few inches maybe sliding it along the wall bracket until it's centered on the wall will do the trick.
I found this thread researching the same issue. My TV is going above a gas fire place and the studs are about 6" off center. I'm using a Cheetah articulating wall mount and I think sliding the TV along the wall mount by six inches will yield the results I'm looking for.
I'm not looking for a construction project, I just want to mount a damn TV.

Haha, I agree with you on the project part. I'm going to try that move first since I'm only maybe 6 in off. Doesnt mean im going to hang mount then take down, im just having a hard time visualizing and figuring it out without having the mount in hand. Things just drive me crazy if they are off. Plus I think I will be on the very edge of the bracket. My TV needs 17" and the plate it mounts to is only 30ish.
post #14 of 14
Quote:
Originally Posted by Stickbo View Post

Haha, I agree with you on the project part. I'm going to try that move first since I'm only maybe 6 in off. Doesnt mean im going to hang mount then take down, im just having a hard time visualizing and figuring it out without having the mount in hand. Things just drive me crazy if they are off. Plus I think I will be on the very edge of the bracket. My TV needs 17" and the plate it mounts to is only 30ish.

I'm in the opposite situation. I have the mount in hand, but no TV! So until CEVA delivers my TV, the mount is sitting in the box. However, if the mounting holes on your TV are more towards the center of your TV, you may be in luck so just measure that distance against the length of your wall mount.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: LCD Flat Panel Displays
AVS › AVS Forum › Display Devices › LCD Flat Panel Displays › Mounting TV to wall, off center studs need help and advice please