Reply by noise_expert

The limiting factor to this will be the number and size of fixings used to fix the mating cleat to the wall. The larger or more the better. Both halves of the cleat will be in compression, as will the studs, so their size should be more than adequate – the fixings will be in shear, so if their is any failure, this is where it will happen!

Also, if you use a second cleat ensure that both are supporting the load of the unit. Just the smallest amount of gap will mean that all of the load is only being taken by one support, so the second may as well not be there.

Andy, UK