a ridge vent for tile roofs . the vent includes first and second sub - flashing portions for spanning air gaps provided between the upper reaches of a roof deck and below a centrally located ridge beam . a plurality of ventilation apertures are provided in each of the sub - flashing portions . a top cap flashing is provided for attachment above the ridge beam . included in the top cap flashing are a plurality of ventilation apertures defined by edge wall portions . a tile roof is provided , of the flat , low profile undulating , or of the s - tile type . tiles are provided in rows up to the edge of the sub - flashing . the gap between the top of the tiles and the bottom of the top cap flashing is preferably provided with a weathertight seal . ridge cap tiles are provided in conventional stacked fashion running along above the top cap flashing . as a result , a generally triangular ventilation gap is provided along and below the lateral edges of the ridge cap tile , which allows air to enter and leave the attic space below the tile roof , while providing high resistance to wind blown water .