For years, the concept of a vapor canopy has met with great scepticism among some creationist scientists. The principle reason for such doubt has centered in the physics involved in maintaining vast amounts of precipitable water in the atmosphere. Our present atmosphere will only hold about 4.4 inches of water, and yet the vapor canopy idea requires many feet of water if it is to be the source of a global, 40-day rainfall. Also, this theory has been objected to on the grounds that intolerable hothouse conditions would result. In this article, an attempt is made to present a plausible support mechanism and to demonstrate that the surface temperatures may indeed have been quite mild.