AmeriDex is the only above-joist Dryspace system where the cellular PVC boards and the patented Dexerdry seal lock together at install, so 100% of rain runs off the deck instead of into your joists.
Visualize the perfect finish for your AmeriDex system.
Pick your colors, layout, and size, and see your AmeriDex deck come to life, complete with the Dexerdry seal, before you buy. Free. No signup to start.
Every rainstorm sends water through the gaps in a normal deck. It soaks the joists, rots the framing from above, and drips on whatever is below. Composite boards do not fix it. They hide it. Most homeowners do not see it until a contractor pulls a board in year 12.
AmeriDex is the only system that stops it on day one.
See how AmeriDex stops itThe AmeriDex water-diverting system stops every drop at the surface, before it ever touches your joists or beams.
Most under-deck drainage systems are retrofits. AmeriDex is engineered into the deck itself.
An above-joist deck drainage system stops water at the walking surface. The waterproofing happens between the boards, on top of the joists, before a single drop reaches the framing. AmeriDex is built this way. Cellular PVC deck boards lock onto the Dexerdry TPE seal as the deck is installed, so 100% of the rain is diverted off the deck and away from the structure.
Below-joist, retrofit drainage systems are different. They are tray, panel, or membrane assemblies hung underneath an existing deck after the boards are already in place. Water still falls through the gaps in the deck boards, soaks the joists and beams, and is caught in a tray below. Over time, those wet joists can rot, fasteners can corrode, and stains can bleed through onto the panels.
If you are building a new deck and you want a real dry space under the deck, integrated above-joist drainage is the only way to keep your framing dry for the life of the structure. See the full above-joist vs below-joist comparison, read the deeper above-joist deck drainage explainer, or learn about AmeriDex and the patented Dexerdry seal behind the system.
Outdoor kitchen. All-weather lounge. Year-round play zone. The same square footage you already paid for, finally usable in any weather.
Tell us where to send it and we will mail you a real cut of an AmeriDex board and a piece of the Dexerdry seal. Hold it. Bend it. Pour water on it. Show it to your builder.
No one will call. No follow-up unless you ask for it.
Ship my free samplesA new pressure-treated frame in 12 years runs into the thousands for an average NJ deck, plus tear-out of whatever sits on top of it, plus the lost use of the yard during the rebuild.
The AmeriDex Dryspace System is engineered so you only build that frame once. For most NJ-shore homeowners, the system pays for itself the first time the neighbor's deck has to come down.
Straight answers on materials, installation, and keeping the space under your deck dry.
Materials
A deck seal has one job for decades with no second chance. Why automotive-grade TPE is the right material class, and how Dexerdry reinforces it further for permanent outdoor exposure.
Materials
Composite still hides wood fiber under a cap. Cellular PVC has none. A full comparison on moisture, weight, lifespan, and a straight answer on cold-climate thermal movement.
Jersey Shore
Salt air, humidity, and Nor'easters punish shore decks and rot the framing where you cannot see it. Why coastal decks fail faster, and how an above-joist PVC system keeps one dry for life.
Most AmeriDex builders book their season early. Get on the calendar now and we will match you with an authorized AmeriDex installer near you.
