Actually, the decking could also be composite deck boards but in both cases the boards deck boards, and catchment sytems or under deck waterproof options.
3 products in 1 - DryJoist structural waterproof deck systems; this means that along with Obviously we would love you to install our capped composite decking.
The Ultimate Time Saving 100% Waterproof Deck System For Balconies and Second Stories. Waterproof Deck System - Three products in One! Only two parts.
One option is to cover the deck boards with a watertight membrane. a new deck or replacing your deck boards, you can use a system like Trex RainEscape,.