I have patches of insulation in the attic, spots with some and some with without. I went into the attic to insulate above the bathroom with ROXUL batt insulation. The guys at work today told me that I should have put a vapor barrier down before the batt insulation. I did this on the exterior walls but the inspector told me that I didnt have to put it in the ceiling so I didnt when i had the place gutted. I made sure to seal the holes in the attic but i didnt use a vapor barrier? Is it standard practice to put down a vapor barrier in the attic?