Plaza and Deck provides a thin, lightweight, weather and frost resistant installation for ceramic tile, pavers, brick or stone. This system is designed for use over roof waterproofing membranes. An integral subsurface drainage component provides for elimination of infiltrated water. Plaza and Deck System eliminates the dead load problems (50 lbs/ft2 /245 kg/m2) and high haulage/placement costs associated with conventional gravel drain beds.