The waterproof decking that Im most familiar with is Admirals SpaceMaker Outdoor Flooring Between boards is what the company calls a Super Seal, a type of gasketing system that has proven to be effective in preventing water from leaking through the deck surface.
Waterproof Decking - Watertight Deck Stays Dry On Top and Below The Versadry Waterproof Decking Solution is Watertight and Versatile. Create dry usable storage space under your deck WITHOUT THE PUDDLES ABOVE and live on an aluminum deck that doesn't sound, feel or look like an aluminum deck thanks to our 60-80 mil thick coating.
The best defense is to minimize gapping between the decking and the framing and to keep the decking well fastened. Fastening the boards down near the edges helps the boards lay flat; otherwise they tend to curl up when the hot sun hits the top surface but the underside remains damp.
Site-built deck drainage. 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.
3 Tips for Building an Enduring Deck . Since most decks are made of wood, we can of course expect them to rot eventually. The average deck, composed of treated lumber joists, beams and posts, will last somewhere between 15-25 years depending on the climate zone it is in and how much water it is tormented by, not to mention how it is built.
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