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here is an article in fine-homebuilding on site-built deck drainage. in this article they use epdm rubber roofing material. i wouldn't hesitate to use this or creative alternatives but i wouldn't consider this as a "waterproof/roof" system. i would consider it rain-proof where it diverts rain and rain-runoff from underneath the deck.
rather than have a mound of exposed earth under the deck that would take in and disperse through evaporation a lot of moisture. have a plastic liner on the ground to shed any water that got under there. perhaps add a fan to increase air flow. basically just keep the air space under the deck drier than it normally would be.
if your deck was built with pressure-treated lumber rated for ground contact the wood will be very resistant to rot. if it was built of untreated redwood cedar or other wood there is a greater risk of rot particularly if the wood is light-colored sapwood rather than dark-brown heartwood.
georgia-pacific gypsum has improved densdeck® prime roof boards with eonic™ technology a patent protected enhancement. incorporating eonic™ technology has doubled densdeck prime’s resistance to moisture making it the only roof board with manufacturing specifications that include 5% total water absorption resistance by weight and 1 gram surface water absorption performance on both sides.
damp-proof membrane is used to protect buildings from moisture by creating a damp resistant barrier. commonly used to protect a buildings concrete slab from moisture rising from the foundations damp-proof membrane is a versatile product and can be used for a wide range of applications such as creating a protective surface before laying laminate or wood floors.