Absolute safest way to wall mount TV on plasterboard

[burg]

Sorry for yet another TV wall mounting post, I've just bought the LG G4 65" OLED which weighs about 23kg according to the specs, it's also sadly quite expensive so I want to make sure I get this wall mounting right!

I'm planning on mounting it on a plasterboard stud wall as this specific TV has a built in mount that when pushed back makes the TV flush with the wall. I was originally going to open the wall up, fit some extra noggins and mount it on those but after searching on here it seems most professionals recommend going with plywood across studs instead so I'll go that route, even easier! Just checking my thoughts here....

- Find the mid point on my wall where I want the TV mounted, cut out a rectangle thats smaller than the TV which should reveal at least 2 studs (given the TV size)
- Mount a 12mm(?) piece of hardwood plywood within this gap to the studs, pilot holes to avoid the studs splitting.
- I'm guessing 12mm is plenty thick enough? It would be good at 12mm as it should hopefully mostly match the plasterboard thickness then.
- How many wood screws and what screw size would you recommend per stud?
- Is it worth "padding out" the back of the plywood where the mount is going so the mount screws have more to grip or is this a non issue?
- Cut out a hole for cable access as I'm going to be running cables to the console table below the TV.
- I'm not sure if there's a recommended conduit size/type for this?
- Secure the mount to the wood. Given this TV pushes flat against the wall there's no need to tidy anything up here.

Thanks!

 

[Wayners]

Use a magnet to find the screws or nails in studs. Old magnetic phone mount I use or buy a cheap rare earth magnet.
Then screw MDF over studs.
Emulsion in to match wall.
Fix TV to MDF
Watch

 

[burg]

Use a magnet to find the screws or nails in studs. Old magnetic phone mount I use or buy a cheap rare earth magnet.
Then screw MDF over studs.
Emulsion in to match wall.
Fix TV to MDF
Watch

Sadly not that easy on this one. The TV fits fully flush with the wall, so the board needs to be also flush with the plasterboard. I don't want to see a wedge of MDF between the TV and the wall!

Any reason MDF over hardwood plywood?

 

[freddiemercurystwin]

You would only see it if you were stood right next to the wall. Are you saying the TV instructions instruct you to chop out a bit of plasterboard?

 

[burg]

You would only see it if you were stood right next to the wall. Are you saying the TV instructions instruct you to chop out a bit of plasterboard?

You don't buy an expensive flush mount TV to then have it "not quite" perfect!

The instructions would say fix to the wall and push the TV back to the wall, likely saying aim for a stud if a plasterboard wall. They're not going to give instructions on bracing the wall to support the TV but I'm not going to take that risk. It's intended to be 100% flush with the wall.

Picture added for reference, imagine that with a visible wedge of MDF behind it.

 

[burg]

Turns out I might be getting a bit ahead of myself, the mount looks quite small (I'm still awaiting delivery) but hopefully should be wide enough to at least hit one stud where I hope to place it. Perhaps 1 stud with the rest of the holes toggle bolted/plugged will suffice. I guess I won't know until I attempt to pinpoint the studs to the exact TV location.

 

[freddiemercurystwin]

Yea, OK but you'll only perceive it to be flat against the wall when you're stood right by the wall.

 

[burg]

Yea, OK but you'll only perceive it to be flat against the wall when you're stood right by the wall.

The layout of our living room means the side of the TV is quite visible when walking around the room, it's not on a distant wall where you'd only look at it straight on so it's important to get fully flat.

 

[mattylad]

Personally I think your first suggestion works best, it's a big TV and you certainly do not want that coming down.

Yes I'd pad out the back of the plywood, the more meat for screws to grip into the better, use plenty of screws into the joists.
Make it bomb proof.
Paint it once done so it matches the wall colour.

 

[burg]

Personally I think your first suggestion works best, it's a big TV and you certainly do not want that coming down.

Yes I'd pad out the back of the plywood, the more meat for screws to grip into the better, use plenty of screws into the joists.
Make it bomb proof.
Paint it once done so it matches the wall colour.

Thanks, the more I've read online the more I think it's probably fine to line up one stud and toggle bolt the rest. It's not an articulating arm and the consensus seems to be 1 stud will be plenty sufficient at a "light" 23kg. I think I'd have to be very lucky to hit 2 studs with the mount where I need it but I'm sure I could find one to line up.

I'll see what the general consensus here is but perhaps I'll stick to my initial idea when it arrives and I see how big it is!

 

[slawit]

If your happy to remove plasterboard behind the TV and let in a piece of ply, then there is nothing stopping you from putting in extra noggings between the studs, this will give you more than 12mm of thickness to screw into which I think you need. Like you say once painted it wont be seen.

 

[foxhole]

Only needs a 150mm high ply spanning two or more studs for a secure fit .

 

[opps]

I understand your concern, but 23Kg really isn't that much.

Fittings such as Timco Zip fittings are rated at 30kg in 9.5mm. On the balance of probability, you will find two studs to drill into- granted, you may need to drill through the metal frame to ensure that you hit a joist.

 

[bernardgreen]

This might be over kill for your project but it does provide a secure fixing for a batten or a bracket. It prevents cracking of the plaster board if the insulation squeezes under the pressure of the batten onto the plasterboard.

Drill a hole the diameter of the spacer as far as the brick.
Drill a hole for the wall plug ( blue )
Push the spacer into the hole
Put the batten or bracket in place and screw into the wall plug

The spacer can be any shape provided it will be hidden behind the batte

 

[burg]

If your happy to remove plasterboard behind the TV and let in a piece of ply, then there is nothing stopping you from putting in extra noggings between the studs, this will give you more than 12mm of thickness to screw into which I think you need. Like you say once painted it wont be seen.

This was my original plan until I started reading on here and generally the consensus was to use the plywood board across two studs instead of noggins between the studs (and screwing into the noggins). I can do either so I'm not fussed but I guess the plywood approach is a touch easier.

This might be over kill for your project but it does provide a secure fixing for a batten or a bracket. It prevents cracking of the plaster board if the insulation squeezes under the pressure of the batten onto the plasterboard.

Drill a hole the diameter of the spacer as far as the brick.
Drill a hole for the wall plug ( blue )
Push the spacer into the hole
Put the batten or bracket in place and screw into the wall plug

The spacer can be any shape provided it will be hidden behind the batte

I'm not too sure I'm following this but in the UK the internal walls are often hollow stud walls, in my case this wall is between two rooms so there's no brick/block sadly, no insulation either!

Your image looks like a DIY version of Corefix fittings which I've used in the past on a dot and dab external wall with success, not on this one though!