Sandy
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I also used the "French cleat" technique for a floating unit in a kitchen and it worked well due to some good secure fixing into a solid brick wall.
Where my fault appeared was in the mistake in working out the weight. I knew the rough weight of the finished unit, but forgot to take into account how much other stuff would be added to it, thus dramatically increasing the total weight.
The fixings remained secure, but the joint between the cleat and unit split and ripped the top face of the unit out and wrecking the whole thing. I'd also suggest running a cleat on the underside of the unit and supporting it from the underside aswell. If you want to go for hidden fixings, how about keyhole slots into the frame of the unit? It'll take a little more planning out the holes for the screws in the wall, but if you do it right, it'll have a good aesthetic look.
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