Abstract: A roof ventilation apparatus for a sloped roof having a cap and base plate is provided. The cap has a top surface and a bottom surface. The bottom surface has a flange that defines an opening to a cavity formed between the top and bottom cap surface. The cavity provides a path for air exchange from a roof opening through an air passage formed between the flange and cap top. The base plate has a flange surrounding a rim that fits inside the cap bottom cavity. The base plate preferably is shaped such that when installed on the sloped roof the cap entirely covers the base plate. Alternatively, a roof vent base plate with a flange having an angled edge configured to channel moisture is described. In addition, a method of installing a roof ventilation apparatus having a base plate and roof cap on a sloped roof is described.