By the team at Water Gate Systems
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If you live in Southwest Florida and have a beautiful travertine lanai or pool deck, you’ve made a great choice. Travertine looks gorgeous, stays cooler underfoot than most other stones in our brutal summer sun, and weathers the salt air better than a lot of alternatives. We love seeing it on our customers’ homes.
But when we install an Aqua-Cade flood barrier on a travertine surface, there’s something worth talking about — and we’d rather talk about it openly than have anyone be surprised later. So grab a coffee (or a sweet tea, we won’t judge) and let’s dig in.
The short version
Travertine is more absorbent than concrete. During a serious flood event, a small amount of moisture can travel through the stone itself and show up on the dry side of a properly installed barrier. It’s usually manageable, it’s usually minor, and there are good ways to reduce it dramatically. Here’s the why and the how.
A quick lesson in stone
Travertine started its life as a hot spring deposit, formed over thousands of years as mineral-rich water bubbled up through the ground. As the water cooled and CO₂ gas escaped, it left behind tiny channels and pockets in the stone. That’s where travertine gets its beautiful texture and its signature pits.
Those same little channels are also why travertine is thirstier than other stones. Here’s a rough comparison of how much water different surfaces will absorb if you soak them for a couple of days:
- Granite: less than half a percent. Basically waterproof.
- Marble: one to two percent. Pretty resistant.
- Concrete: four to eight percent. Decent.
- Travertine: anywhere from two percent to over twelve percent, depending on the variety and how it was finished.
That’s a wide range, and it matters. Premium-grade travertine that’s been factory-filled and properly sealed sits at the low end. Tumbled, unfilled, commercial-grade travertine sits at the high end. Most lanai travertine in Southwest Florida — because we like that slightly textured, slip-resistant finish around the pool — is closer to the high end than people realize.
What this means for a flood barrier
Our Aqua-Cade system creates a tight seal at the spot where the bottom of the barrier meets your floor. That seal is engineered to stop water cold at the line where the barrier sits. It does that job extremely well.
What it can’t do — what no flood barrier can do — is change the nature of the floor underneath it. If your travertine wants to absorb water (and to some degree, all travertine does), water sitting against the flood side of the barrier can soak into the stone and slowly travel through it, sometimes emerging on the dry side as a damp area or a slight weep.
Think of it this way: if you set a wet sponge on one side of a thick book and waited a few hours, eventually the pages on the other side would get a little damp. The book itself didn’t fail. The sponge just kept feeding water into the system. Travertine isn’t a sponge, exactly, but the principle is similar.
For a quick rain event, this isn’t an issue at all. The stone barely gets a chance to absorb. Where it can show up is during a sustained event — say, a hurricane surge that holds water against your barrier for many hours.
How much are we talking about?
In real-world terms? Usually a damp ring or some minor weeping that a towel and a wet/dry vacuum can handle. We’re not talking about water pouring through your floor. We’re talking about the kind of moisture you’d see on the inside of a single-pane window on a humid morning.
For most homeowners, the practical impact is minimal. But it’s something we want you to know about going in, because it’s much easier to plan for than to be surprised by.
The good news: there’s a lot you can do
Here’s where it gets practical. The single biggest factor in how much (or how little) moisture you’ll see is whether your travertine is sealed, and how recently.
A penetrating sealer — the kind that soaks into the stone rather than sitting on top of it — can drop your travertine’s absorption rate from over ten percent down to under one percent. That’s not a small change. That’s the difference between a sponge and a stone that performs almost like ceramic tile.
The catch is that sealers wear off over time, and most folks don’t reseal their travertine on the manufacturer’s recommended schedule (usually every one to three years). If your stone hasn’t been sealed since it was installed, it’s probably time.
The kitchen-counter test
Want to know if your travertine is sealed? Try this:
Find a spot somewhere along the edge of your lanai. Put a tablespoon of water on it. Start a timer.
If the water beads up like it would on a freshly waxed car and stays beaded for ten minutes or more, you’re in great shape — your sealer is working. If it disappears into the stone in under five minutes, your sealer has worn off and it’s time for a refresh.
That’s it. That’s the whole test. You don’t need a kit, you don’t need a contractor, and it tells you almost everything you need to know.
What about grout?
The grout between your travertine tiles deserves a mention too. Travertine itself isn’t even the easiest path for water to travel — it’s often the grout joints. If your grout is cracked, missing in spots, or hasn’t been sealed, water can move through there even faster than through the stone.
If you’re going to invest in resealing, do the grout at the same time. Most penetrating sealers will handle both.
What we do on our end
When we install an Aqua-Cade on a travertine surface, we adapt our approach. We use additional sealant beads along the bottom to bridge any grout joints the barrier crosses. We tool everything carefully so there are no skips. And on jobs where the travertine is particularly thirsty — older stone, unsealed, or unfilled commercial grade — we’ll often recommend a pre-installation sealer treatment along the seal path.
That treatment is fast, inexpensive compared to the value it adds, and gives you a much better hydraulic break right where it matters most.
The bigger picture
Here’s the honest take from someone who’s been installing flood barriers in Florida for a while: no flood protection system is a magic force field. The Aqua-Cade is excellent at what it does — keeping floodwater on the side of the barrier where it belongs. But your home is a system, and a good flood plan thinks about all of it: the barrier, the substrate it sits on, the drainage around your property, your insurance coverage, and what you’ll do during a storm.
Travertine isn’t a problem. It’s just a piece of the puzzle that’s worth understanding. And the good news is that the things you’d do anyway to take care of beautiful natural stone — keep it sealed, keep the grout in good shape, give it some love every couple of years — are the same things that make it work better with a flood barrier.
Got questions?
If you’ve got travertine and you’re thinking about a flood barrier, or if you already have an Aqua-Cade and you’re wondering whether it’s time to reseal your stone, we’d love to talk. Give us a call. We’ll come take a look, do the bead test for you, and tell you straight what we’d do if it were our own house.
That’s the only way we know how to do business.
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Water Gate Systems is a veteran-owned manufacturer and installer of the Aqua-Cade flood barrier system, serving Lee, Collier, and Charlotte Counties. Find us at watergatesys.com or give us a call at 239-243-9571.
