Just wondering how to do this. It’s an older Samsung 40″ thing so reasonably heavy compared to what can be achieved today. It’s going on a wall that, although brick/stone behind, is plasterboard on a wooden frame. Gap from plasterboard to brick is about 45mm.

Can I get a normal mount and just use really long bolts, or do I need something else?

Normal screws and plugs make sure screws are long enough and you tap plugs into the stone by knocking it in with the screw

Rigifix:-

http://www.amazon.co.uk/Rigifix-Lined-Wall-Anchor-Mounting/dp/B004WDG2TO

Marvellous work folks. STW is on fire tonight.

http://www.ebay.co.uk/itm/Picture-Photo-40kg-Plasterboard-Wall-Fixings-x-6-/251450586850?_trksid=p2141725.m3641.l6368

I would cut a square of plasterboard out covering at least 2 uprights, screw a square of 20mm (min) ply in its place, and screw TV bracket to it……fitted loads like this…..problem with through-fixings with gap behind is you’ll be pulling the outer plasterboard in towards the brick/block…..

if you only want it flat try this, i have it on 3 tvs, works brrilliantly

http://www.amazon.co.uk/OMNIMOUNT-OMF-OmniMount-13inch%C2%A8C46inch-Universal/dp/B002DEMAWM/ref=lh_ni_t?ie=UTF8&psc=1&smid=A2UM0KGAOISHDW

You’ve still got the issue of mounting on plasterboard with gap behind

the omnimount just goes into the plasterboard, up to 40lbs on drywall, the gap behind doesnt matter.
my 3 tvs are all on plasterboard

It’s not exactly on plaster board its drylined which means there is stone or brick just behind it , as long as you drill into the stone /brick you will be fine ,over the years I have fitted hundreds of radiators this way ,a lot heavier than your tv , your just going to end up spending pointless money so as I said drill into stone/brick and use plugs and screws

excuse mybad, i thought dry lined was plasterboard 🙁
still the kit is only £14

What I meant was its not just a plasterboard wall there is a stubstantial fixing behind it , plasterboard fixings are only as good as the plasterboard it’s self if it’s old or slightly damp the fixings can pull through, I’m only giving my experience being a tradesman not a diy fella

Do you know where the wooden joists run? My house has these uprights at 24″ intervals. If there is a pair of conveniently-placed joists then mount it to them, or use fixings into the masonry either side of a joist so the fixings don’t compress the 45mm gap between the drywall / plasterboard and the wall.

Ultimately, whilst the TV is moderately-heavy, you’re not going to be swinging off the mount and it sits close to the wall so there’s not too much of a moment.

Have you thought about snap toggles?

Amazon Link

the three tvs i have fixed havent come loose in the 3 years they have been fitted, as the weight is mostly in shear force, most of the weight is diverted down rather than out and away from the board