In an earlier contribution to this discussion,
Antix wrote:

Hi,
I'm about to mount a 30Kg Arm on a brick wall with a 34Kg Plasma
screen hanging off the end of it. The arm can extend to 26" so
clearly there's going to be enough torque to open up a new door
between my neighbour and I (it is a cavity wall so no danger of me
drilling through next doors family portrait)

I'm bit unsure about which fixing to use. Shield anchors or Sleeve
anchors look like they'll do the job but one concern I have is putting
too many of those in might cause the brick to disintegrate. It's an
1860 build with stone outer wall...I'm pretty damm sure it'll be brick
behind the plaster on the inner wall as other walls have been - will
be checking that this week..)

Anyone have any thoughts on the best type and size for this sort of
job ? Theoretically I can get 7 bolts on the top edge and 7 on the
bottom but after drilling those out, I doubt there'll be much Brick
left to anchor into ! (the mount hols are about 4.25" apart).

http://www.premiermounts.co.uk/PartD...AM3_Rev03_.pdf

I'd go for masonry screws - something like this
http://www.screwfix.com/app/sfd/cat/...33706&id=16525 - which screw
straight into the bricks without using any plugs. You have to drill the
right size hole - which varies a bit depending on the material.
--
Cheers,
Roger
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