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Concrete topping specification for lightweight floor joists with plywood sheathing?

Concrete topping specification for lightweight floor joists with plywood sheathing?

Concrete topping specification for lightweight floor joists with plywood sheathing?

(OP)
I am working on a multi-family building where we have cold formed joists at floors typical. We have 19mm plywood sheathed over to provide diaphragm action. We are going to pour a concrete topping over the plywood to achieve better STC and IIC values. Just one problem... NOBODY IN NEW ZEALAND HAS EVER DONE THIS (apparently). I have scoured the internet high and low (and these forums) and I cannot find a specific specification for this. Now, I know this is common practice in other countries like USA but surely there is a "drag and drop" specification for this type of topping?

In other words, surely there isn't large aggregate in it, so there is a max aggregate size. Also, to prevent the topping from curling up wouldn't there need to be some sort of fibre reinforcing to it, and if so, to what proportions?

Am I crazy here? I don't want to reinvent the wheel!

RE: Concrete topping specification for lightweight floor joists with plywood sheathing?

Most often here in the US, a gypsum concrete topping is used.

Gyp-Crete

Here is a link to one of the commonly used toppings

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