Mounting TV in a new house?

[snowjim]

Hello,

I have a 65" TV that weighs 36 kg, and it needs to be mounted on the wall in the new house, and of course, I want to make sure it doesn't fall down.

The mount I have is called Deltaco ARM-421, and it comes with some screws for concrete and wood walls.

Now, the question is how do I ensure that it holds? The first step is to figure out what kind of wall I'm attaching it to, and when I knock on it, it sounds like wood, or possibly drywall. Then I'll probably also need to know the thickness.

Part of the wall I am mounting it on is a wall that was put up afterwards to partition a room, so it's likely that different materials were used.

Suggestions on how to proceed safely and effectively?

 

[Micro]

If it's a newly built house, you might be able to ask the builder what the wall consists of.
If the house is pre-owned (new to you), you might be able to ask the previous owner how the wall is constructed.
You can try to locate where the studs are in the wall, you might be able to see or feel where the joints are on the wall covering.

 

[snowjim]

This is a house built in '71, so it has some years on it. I have tapped on the wall and can hear that there are occasional studs, but there is a very large gap between them. I have tried to reach the previous owner but haven't received an answer yet. Otherwise, I'll mark where the holes should be, test drill with a smaller drill bit, and see what material is there.

If it's not drywall, might one still need molly bolts?

 

[mexitegel]

If it's built in '71, it's probably chipboard in the wall. Use molly bolts, and it'll hold well, even better if you can place some screws into a stud, of course.

 

[Micro]

My house built in 1971 has 12mm board (masonite) as wall covering and it seems to be framed cc1200. I have used molly to mount my 52" TV.

 

[snowjim]

I received a response from the previous owner, and he says that half the wall is drywall and the other half is some type of board, probably similar to the one Micro has.

So what I need here are 4 molly bolts. The question is what size might be required for 36 kg? The wood/concrete screws that are included look quite coarse, to say the least (7-8mm and 55mm long). Then there’s also the question of whether it's double or single drywall. What lengths should be purchased?

 

[SBH]

wouldn't trust chipboard with my TV.
after screwing a screw into chipboard and testing pull and hang, nope. no TV is going on a chipboard wall here.

 

[mexitegel]

First, drill to see if there are double boards, it's not likely but you can never be sure.

I would go with Molly with a 6mm screw. You might need washers between the screw head and the bracket as the heads of the Molly screws might be too weak and go through the screw hole in the bracket.

 

[snowjim]

would not trust chipboard with my TV.
after screwing a screw into chipboard and testing drag and hang, nope. no TV on a chipboard wall here

Pulling straight out is probably not the right way to test, it's the weight straight down that counts as I understand it, and there molly bolts can handle very heavy weights.

There are those small picture hangers with 3 pins, if you hammer them into a drywall, they can hold quite heavy paintings, but if you pull it straight out, it breaks immediately without any significant resistance.

Of course, you want it to be safe in that direction as well, but if you have 4 molly bolts, it should hold quite well even in that direction. The real pressure is downward, which is assessed at 35 kg.

From what I can read, an M6 molly bolt can withstand 40 kg in simple drywall, so 4 would then be around 160 kg. It also looks like I might be able to secure at least 2 screws into some form of stud, and then I can use the accompanying screws.

 

[snowjim]

Probably it's an M8 that I should get then, so if I buy it for double and single gypsum, I'll have it no matter what it is

 

[snowjim]

I now see that it is actually 6 screws it should be attached with, so 6 molly screws of the m8 model should do the trick

 

[mexitegel]

Then you might even be able to watch a horror movie without it falling down

 

[SBH]

Pulling straight out is probably not the right way to test it; it's the weight straight down that counts as far as I understand, and in this regard, molly screws can handle very large weights.

There are small picture hangers with 3 pins; if you drive those into a drywall, they can hold pretty heavy pictures, but if you pull it straight out, it will break immediately without much resistance.

Of course, you want it to be secure in that direction as well, but if you have 4 molly screws, it should hold quite well in that direction too. The main force is actually downward, which is 35 kg.

From what I can read, an M6 molly screw can handle 40 kg in single drywall, so 4 would be around 160 KG, and it looks like I could possibly secure at least 2 screws into some type of stud, and then I can use the included screws.

tested pull and hang

 

[raveper]

Put up a 65-inch with 3 m5 molly in a double drywall and it's still hanging. It was actually intended for a 55-inch but they thought it was too small.

 

[snowjim]

Was out looking for expanders today. Bygg Max didn't have much to choose from, they didn't even list the sizes. At Harald, I found 12 and 10 mm, i.e., the outer sleeve, the screw itself seems to be around 8mm. Bought both double and single, so we'll see which ones will be useful. My guess is that I'll use 2 wood screws from the stand in the beam, and then 3 molly screws of the coarsest size possible.