What is the difference between 2.5 and 3.4 lath?

If you have painted stucco in addition to this new gable you should definitely use a bonding agent. What he and you are probably calling a sealant. Weld-Crete by Larsens Products is probably the best known. Anytime you stucco over paint the bond is only as good as the bond of the paint to the existing stucco. It is never recommended, we all do it. At least give the painted stucco a good pressure washing before the bonding agent you want to get off all loose paint, dirt, algae and anything else that will interfere with the bond of the bonding agent to the existing stucco. The new stucco will bond to the bonding agent just fine you want to make sure that the bonding agent bonds to the wall.

Now about the plywood. I tend to agree that it expands and can cause the stucco to crack. It is imperative that the required spacing of the plywood be observed. So does open framing without the additional stiffening. I would use 3.4 galvanized lath no matter what. If it were me and I was using two layers of #15 building paper I would cut the first piece down to 18" wide and put it at the bottom of the wall against whatever weep screed or flashing is used. Then I would take a full width piece and take it to the bottom as well. Then each successive layer overlaps the previous sheet by 18". This gives you two layers and good moisture resistance.

How large are the gables?

In these parts houses are sheathed with OSB in the living sections in order to give the walls shear strength. Gables are usually open framing and it works just fine. Over the OSB a layer of MR paper is installed then paper backed stucco mesh that is the equivalent of two layers of paper. Over open framing only one layer, the paper backed wire, is required. That seems counter intuitive but I'm sure there is a good reason for only one layer. Stucco is even more popular here than in Florida but our climate is different.

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