Dexerdry is the patented above floor joist flange gutter placed between deck board which prevents water and the elements from penetrating the surface of the deck. In other words, Dexerdry provides virtual dry space under any outside deck.

TimberTech's DrySpace is a revolutionary drainage system that channels water away from a house's foundation so that the area under a deck is transformed into dry, usable space. Perfect for second story decks, DrySpace easily secures to the joist of any new or existing deck creating more recreational space or additional storage areas.

Ideal for second-story decks, TimberTech® DrySpace is an under-deck drainage system that collects and channels moisture from the spaces between planks. It is easily attached to new or existing deck joists, and comes in an off-white color that lightens and brightens the area under your deck with a crisp aesthetic. DrySpace is made of solid extruded vinyl for maximum strength, durability, and weather resistance, and comes with a 25-year limited warranty.