cinder blocks and wall mount

psd99 · 12 Jan 2011 at 20:24

damn it

I got a my wall mount today but on the front it says

not designed for steel studs or to cinder block walls.

the wall I'm going to put this on is blocks - but not sure if they are cinder blocks
definitely blocks with sand/cement then plaster

the tv weighs 19kg according to website and it'll be 6 screws

will it be safe to mount my tv on these walls?

anyone ever installed on a cinder block wall before?

jellybeard999 · 12 Jan 2011 at 20:30

It should be more down to the correct choice of fixing to the wall; the bracket is just a lump of metal and will be fine. Worst case, pop down your local builder's merchant and check the fixing type is suitable.

psd99 · 12 Jan 2011 at 20:32

thanks the screws are massive

they are more like concrete anchors! (after a google)
there's 6 of em the drill bit I need is 3/16" - pretty thick that

fornowagain · 12 Jan 2011 at 20:36

Look for some fixings called Rigifix. I've just used 6 to mount a TV on a dot and dab wall. I swear you could literally hang a house off them.

psd99 · 12 Jan 2011 at 20:37

thanks what is dot and dab?

fornowagain · 12 Jan 2011 at 20:47

Dot and dab, very common. They just use blobs of adhesive to stick the plasterboard to the block wall. Main problem with a heavy mount or cantilever is the plasterboard has a gap from the block wall and it gets crushed. Those rigifix actually take the load straight to the blocks and protect the plasterboard gap.

psd99 · 12 Jan 2011 at 20:48

fornowagain said:
Dot and dab, very common. They just use blobs of adhesive to stick the plasterboard to the block wall. Main problem with a heavy mount or cantilever is the plasterboard has a gap from the block wall and it gets crushed. Those rigifix actually take the load straight to the blocks and protect the plasterboard gap.

Hi just to reiterate that there is no plasterboard gap in this wall
plasterboard only on the ceiling

it is plaster on top
then sand cement mix
then breeze blocks... breeze blocks yep

(googles breeze blocks vs cinder blocks)

psd99 · 12 Jan 2011 at 20:49

breeze block and cinder blocks are the same thing then

these 6 massive screws that are to go in the wall are really huge

TheCrow · 12 Jan 2011 at 21:23

I would think they type of rawlplug you use is more specific to your wall type? the screws should bite into the plug. But I think I know the ones you use I used them for my kitchen wall units, 1 of them could support my full weight so think you should be fine

fornowagain · 12 Jan 2011 at 21:32

psd99 said:
Hi just to reiterate that there is no plasterboard gap in this wall

Simplifies things a little. The lack of a gap gives a little more load bearing for a wall plate. The rigifx are still a good option for their strength and convenience. But at a minimum all you need is 12mm wall plugs and M8 coach screws. Or even 10mm frame fixings, although I always prefer something with a hex/allen over a screw head.

TripleT · 12 Jan 2011 at 21:38

Aren't breezeblocks like, hollow?

fornowagain · 12 Jan 2011 at 23:25

They can be solid, hollow or cellular. If it's a soft block that won't take a plug then Fischer do some nice chemical/resin anchors.

psd99 · 13 Jan 2011 at 07:48

fornowagain said:
Simplifies things a little. The lack of a gap gives a little more load bearing for a wall plate. The rigifx are still a good option for their strength and convenience. But at a minimum all you need is 12mm wall plugs and M8 coach screws. Or even 10mm frame fixings, although I always prefer something with a hex/allen over a screw head.

hi I got 6 x lag bolts

they are really big

I also have 4 X m40 screws but the 6Xlag bolts are almost double the size and width

also got 6 x concrete anchors (like wall plugs but mahussive)

what do you reckon?

ShadowMan · 13 Jan 2011 at 08:37

Personally I didnt use any of the fixings which came with my wall mount. Do yourself a favour and pop down to a DIY Store and pick up a pack of 100mm M8 Coach bolts with suitable rawlplugs and use those.

I used 8 in a breeze block wall with a dot and dab top to it and it holding up a 30kg TV.

Cost me about £7 extra but worth it for piece of mind. I tend to find the including fixing options are not always suitable for your wall type.

psd99 · 13 Jan 2011 at 08:52

ShadowMan said:
Personally I didnt use any of the fixings which came with my wall mount. Do yourself a favour and pop down to a DIY Store and pick up a pack of 100mm M8 Coach bolts with suitable rawlplugs and use those.

I used 8 in a breeze block wall with a dot and dab top to it and it holding up a 30kg TV.

Cost me about £7 extra but worth it for piece of mind. I tend to find the including fixing options are not always suitable for your wall type.

hiya

so this is the type of screw I got (lag bolt)

the 6 I got look more like the one on the top
they are pretty thicker than normal screws

are these the m8's u are on about?:

surely lag bolts are much more stable? - or is it that they are just too big and too heavy for the breeze blocks?

ShadowMan · 13 Jan 2011 at 09:06

M8 refers to the diameter of the bolt/screw.

The top ones are pretty much what I used by I had thread all the way to the top and no smooth section.

If the bolts are >75mm long then they should be ok but I would still buy new rawlplugs for the wall to ensure they are suitable for your wall type. Any builders merchants or decent DIY store should be able to help.

At the end of the day it is your TV you are hanging on the wall and do you want to take any risk with it?

I have 2 spare of the ones I used at home so if you arent doing it today I can post a pic up tonight.

psd99 · 13 Jan 2011 at 09:17

ShadowMan said:
M8 refers to the diameter of the bolt/screw.

The top ones are pretty much what I used by I had thread all the way to the top and no smooth section.

If the bolts are >75mm long then they should be ok but I would still buy new rawlplugs for the wall to ensure they are suitable for your wall type. Any builders merchants or decent DIY store should be able to help.

At the end of the day it is your TV you are hanging on the wall and do you want to take any risk with it?

I have 2 spare of the ones I used at home so if you arent doing it today I can post a pic up tonight.

thanks that would help yes you are right

I've got to say the actual bolts are really long and I was a bit surprised how thick they are.

the actual rawplugs are more concrete anchors.

just been looking around to see what other people have done.

I believe that my lags are all threaded to the very top - will have to check it out again though.

psd99 · 13 Jan 2011 at 17:50

hi the lag bolts I have are 7cm in length

they have 8.8 written on the end of the screw
they are 90% threaded

I also have concrete anchors with them

please show me picture if you can thanks

psd99 · 13 Jan 2011 at 17:55

btw can someone tell me

1. what is the difference between a masonary bit and a drill bit
it says I need 3/16" drill bit
1/2" masonry bit

can some1 explain the numbers please?

j.col · 13 Jan 2011 at 20:30

a masonry drill bit is just for drilling into masonry eg. bricks, concrete, blocks etc...
then you have a HSS drill bit, this is for steel,
then there is wood drill bits.

there are different types of blocks as mentioned above.
a breeze block is quite light and very grey with a powdery texture. this is mainly used as insulation.
a concete block is often used, this is heavy and quite stoney in texture.
cinder blocks, are kind of a mixture of both textures but black or charcoal in colour.

5 years ago i hung a 42" plasma, it was around 30kgs, and i just used a wall mount off bayofE and the 6 screws and anchors that came with it.
my wall was concrete block, as its a load bearing wall.
there is a technique for it, but cannot remember, i think its something like no 2 drill holes can be within 200mm of eachother (iirc)

edit. a quick google search, 3/16" is the same as 4.76mm, so try a 4.5mm masonry drill bit first, and if the hole id too tight, then get a 5mm bit, or order a 3/16" bit from USA. lol
and a 1/2" drill bit is 12.7 mm