It depends of the use of the building, the climate and the materials of construction. In normal occupancies and moderate climates, SPF insulation typically does require a vapor retarder. Extremes of climate and building use may require vapor retarders/barriers. Check with your design professional for specific recommendations and refer to SPFA technical document, AY 118, Moisture Vapor Transmission for further information.
Do you need a vapor retarder or a vapor barrier with SPF insulation?