A method of constructing shower enclosures which decreases the probability of mold growth by utilizing interior and/or exterior corner directional flow flashings between the joints of the sheets of synthetic marble or other non-porous material which cover the interior of the shower enclosure and the material comprising the vertical walls of the shower enclosure, a shower pan floor sloped downwardly toward the shower drain, a shower floor supported above the shower pan floor by spacers or mortar piers creating a void for air circulation between the shower floor and the shower pan floor, spacing between the shower floor periphery and the vertical walls of the shower pan to provide additional air circulation between the shower floor and the shower pan floor, shower enclosure horizontal framing members that are sloped toward the shower drain, shower enclosure horizontal framing members that are covered by the shower pan, a void, to increase air circulation, between the top of the shower pan vertical walls and air space between the framing members of the sheetrock used to enclose the shower stall, and a weep line positioned between the shower pan floor and the shower floor to permit insertion of mold inhibiting chemicals. Also disclosed is the shower enclosure so constructed.

A flashing providing directional vanes, ribbing, scoring or etchings on its working surface which is suitable for joining, or providing backing for, sections of roofing materials, sections of exterior wall material, particularly at corners, and sections of the walls of a bathtub or shower stall and causes accumulated moisture flow to be directed inwardly toward a moisture drainage point for the flashing rather than outwardly toward the surrounding building structure.