Thanks for the info, the ceiling im trying to insulate is a porch that was turned into a sunroom. There are no soffits or attic, its more of a slanted roof off the back of my house.
@andyGump, I though the foam insulation acted like a vapor barrier and it should be under the insulation between the warm and cold zone?
Although its not the best picture, this is what I am in the process of insulating. My plans were to add insulation and then the foam. Do you recommend that I put the foam first and then the insulation? I live in Boston and its 20 degrees and snowing today, im trying to seal this up quick, thanks!