Hanging Things on the Wall

[sossage]

OK, here's an interesting one....

Does anyone know if there's a (semi) scientific way of working out fixings vs weight of items that are suspended on walls.

I would guess that this depends on the wall, the weight of the item and the surface area that it can be secured over.

Reason i'm asking is i've got a 45kg (approx) plasma screen to fix to a block wall (43" diagonal size). The manufacturers instructions specified at least 4 "screws", so i've put in 7 as i don't want to drop it ! It's pretty well secured so i think i'm safe, but was interested to see if there was a "rule of thumb" etc. for these type of things ?

I'm sure one of you boffins can give me the answer

Cheers
Soss.

 

[breezer]

it would also depend upon the breaking strain of its fixing material I.e piece of string tied at both ends

 

[DAZB]

Usually you can look on the packaging of certain fixings and it will give a load rating relative to the wall construction being fixed into but that usually relates to a cavity wall or lightweight block construction. In general with either a concrete block, or brick wall then any suitably sized screw should be ok. If you want to be extra cautious you could use a Rawlbolt type fixing which, if fixed into sound brick or block, will not budge.As you tighten them they expand inside the wall and give a very strong grip. I would recommend using a Rawlbolt fixing of 60-75 mm with a diameter of 5mm + depending on the size of the holes in your fixing brackets.Hope this helps.