Chris, your insulation contrator doesn't know what he's talking about.

If your house is heated, it must have a vapour barrier on the warm side of the insulation, period.

Now that's not to say it mnust be poly. If you have sprayed foam insulation it will acts as a vapour barrier. It will not do anything for the fiberglass between the heat and the foam though.

In Canada a vapour barrier is required by law. The same applies every where else I have seen.

I'm sorry to say you have few options, short of tearing out all the drywall and installing a vapour barrier.

Best of luck.

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