I did a residential rough in and had my home runs running down an exterior wall(will be insulated with cellulose insulation). I secured the NM cables using the plastic NM cable stackers that hold a total of 8 flat cables in 4 seperate slots. I am being told that this is a violation of 334.80.The way the stackers are constructed is that there is a thin strip of plastic between each slot that the wires fit into. I don't see anywhere where it says how much space has to be maintained, any thoughts on if this would be a code violation. thanks.