YOUR SLIDER IS THE WIDEST DOOR IN THE HOUSE. PROTECT IT LIKE IT.
Custom flood barriers for sliding glass doors, patio sliders, corner lanais and L shaped openings. Measured to your exact span, fabricated in St. Petersburg, rated to 10 feet of water.
A sliding door flood barrier has to span twice the width of a front door and seal against a track built to drain, not hold. That is a fabrication problem, not a shopping problem. We build flood barriers for sliding doors to the millimeter, including L shaped flood barrier configurations that turn a corner.
The widest opening, the lowest threshold, the worst seal.
Ask any Florida homeowner who took water where it came in, and the answer is usually the same. The slider.
A sliding glass door is the largest single opening in most homes. Eight, ten, sometimes sixteen feet across. It sits low to the patio because that is what makes the indoor outdoor look work. And its track is engineered to shed rainwater out, which means it is engineered to let water move through it, not stop it.
Put those three things together and you have the most vulnerable point in the house wearing the nicest trim. A barrier that spans that width has to resist far more pressure across the span than a front door barrier ever will, which is why fit and rigidity matter more here than anywhere else on the property.
Straight runs, corners, lanais, pocket doors.
Florida homes do not have one kind of slider. Here are the configurations we build for, and what each one needs.
Two and three panel sliders
The common six to twelve foot patio slider. Channels mount around the opening, panels drop in and compress against the gaskets. The most straightforward build we do, and still measured to your exact span rather than a size range.
Four panel and wall-width sliders
Once you get past twelve feet, water pressure across the span becomes the engineering question. Reinforced channel depth and center supports are designed into the system so the panel does not flex in the middle where it matters most.
Corner sliders and wrap-around lanais
When sliders meet at a corner, a flat barrier leaves the joint open. An L shaped flood barrier turns the corner as one continuous sealed system, so there is no seam at the exact point water wants to push through.
Pocket and disappearing sliders
Doors that slide into the wall leave a wide open span with no center post to anchor against. These get a purpose-built channel layout so the barrier has structure where the door frame does not provide any.
French doors and double swing patios
Two active leaves, a center astragal, and thresholds that rarely sit flush. We measure the actual opening, not the door spec, because in older Florida homes those two numbers are almost never the same.
Lanai and screen enclosure openings
A screened lanai does nothing against water, so the real line of defense is the slider behind it. We assess whether to protect at the enclosure or at the door itself based on how your patio drains.
The slider is one opening. Water tries all of them.
Sealing the biggest opening and leaving the garage, the front door and the flood vents open is a partial answer. The assessment maps every point water can use so you can protect them in the right order.
One assessment, one coordinated system, one team. Your home gets protected as a whole, in whatever order makes sense for your budget.
Built for the span, not for the shelf.
2.5X stronger. Better sealed.
Aerospace-grade aluminum that is 2.5X the thickness of most competing products, rated to 40,000+ PSI. On a wide slider that thickness is not a spec sheet brag, it is what keeps the panel from flexing at the center of the span. Dual-phase EPDM gaskets strengthen as water rises against them. Rated to hold back up to 10 feet of water.
Measured, not ordered.
Every slider in Florida is a slightly different opening, especially in homes that have settled or been renovated. We measure the actual span, fabricate for it in St. Petersburg, and install it ourselves. No subcontractors, no shipped kits, no guessing at fit.
View System Specifications
Aerospace-grade aluminum, reinforced channel depth, solid cast stainless steel hardware, and dual-phase EPDM gaskets. The parts that matter most on a wide opening.
Nobody plans around the slider until after.
The nice view is the weak wall
The feature that sold you the house is a twelve foot opening at patio level. In a surge event it is the largest unprotected surface on the property, and it is the one people forget to plan for.
Tracks drain, they do not seal
A slider track is designed to move rainwater out of the house. That is the opposite of what you need when water is trying to come in, which is why weatherstripping and tape do nothing here.
Surge is the threat
The National Hurricane Center identifies storm surge as the greatest threat to life and property from a hurricane. Helene proved it across Tampa Bay without hurricane winds ever arriving here.
Corners need a plan of their own
Wrap-around lanais and corner sliders leave a joint that flat barriers cannot close. An L shaped system built as one piece removes the seam entirely.
Five steps, no size charts.
Free assessment
We measure every slider, door and opening on the property and tell you which ones carry the most risk. No cost, no obligation.
Exact quote
Each opening priced out so you can decide what to protect now and what can wait. Real numbers for your actual home.
Fabricated in St. Pete
Panels cut, welded and gasketed to your exact span at our facility. Lead times are shortest early in the season.
Installed and practiced
Channels mounted around the opening, panels fitted, one practice run so you know exactly what storm day looks like.
Ready every season
Panels store flat and redeploy year after year. Minutes to go up when a watch is issued.
Sliding door flood barriers: common questions.
Can you make a flood barrier for a sliding glass door?
Yes. Sliders are one of the most common openings we protect. Every barrier is measured to the exact width and height of your door and fabricated in St. Petersburg, so fit never depends on a standard size range.
What is an L shaped flood barrier?
One that wraps a corner instead of sealing a single flat opening. Corner lanais and sliders that meet at a corner post need a barrier that turns the corner and stays sealed at the joint. We build these as one continuous system.
How wide a slider can you cover?
Wide spans get reinforced channels and center supports engineered for the opening. Because everything is measured and fabricated for your home, width is a design question rather than a hard limit.
Will it damage my slider or patio?
Channels mount permanently around the opening and are designed to sit discreetly when panels are not up. Panels store flat and deploy in minutes.
Do I need to protect the lanai or the slider?
Usually the slider, since a screen enclosure does nothing against water. We assess how your patio drains and recommend the line that actually holds. See flood barriers for home.
What does a sliding door barrier cost?
It depends on the span and configuration. See flood barrier cost or book a free flood assessment for an exact number on your openings.
Don’t just take our word for it.
Our founders’ own homes flooded in Hurricane Helene. They built the company local news has covered ever since.
“The St. Pete friends’ homes were both flooded by Hurricane Helene, and they built a flood prevention system with sturdy aluminum and modular height options.”Read the FOX 13 story
“A pair of St. Petersburg flood victims opened Dam It Defense to provide residential flood barriers after Hurricane Helene impacted their homes.”Read the Bay News 9 story
“The company opened its first factory in St. Petersburg’s Warehouse Arts District a year after Helene, and the cofounders said family and community sit atop their list of priorities.”Read the St. Pete Catalyst story
“Dam It Defense launched in 2025, sold several hundred systems, and grew into a local team of nearly 20 employees.”Read the Power Broker feature
Trusted across St. Petersburg & Tampa Bay.
Lee was very informative about the system. The panels are light enough that anyone can install them, and they provided extra pieces and even offered to move the sliding system once my patio is finished. The company has been easy to work with. I have peace of mind if another hurricane comes. Would recommend this company!
After our home flooded from Hurricane Helene’s storm surge, we decided to install flood barriers. Dam It Defense installed them at all our garage and door entryways, and they store and deploy them for us when hurricanes threaten. They answered all of our needs. The product is well constructed and heavy duty.
We feel very fortunate to have found Dam It Defense. The pricing was lower than any other company and the product far superior. The install team led by Andrea was thorough, professional, and did an amazing job. Everyone from the owners to the installers was knowledgeable and incredibly service oriented. It was a no brainer to go with them.
I reached out to Dam It Defense and Lee came out the very next day, on time as scheduled. He went over the process, showed us samples of the panels, and measured all the entry points. He was extremely personable and patiently addressed every concern and question we had. It really put us at ease.
Real homes. Real installs. No generic kits.
On-site install
Our team setting channel anchors on-site. Every opening is assessed and measured before a single component is fabricated.
Built in St. Pete
Cut-to-measure components on our St. Petersburg floor. No generic kits. Every piece is built for your specific opening.
The seal that holds
Dual-phase EPDM gasket and seal components. Larger and more compression-resistant than standard barrier gaskets.
Torqued to spec
Compression hardware torqued to spec during installation. This is what creates the seal that holds across a wide span.
Serving St. Petersburg, Tampa Bay, and the Gulf Coast
St. Petersburg
Venetian Isles
Riviera Bay
Pinellas Beaches
Indian Shores
Indian Rocks Beach
North Tampa Bay & Nature Coast
Dunedin
Safety Harbor
Spring Hill
Crystal River
Tampa
Davis Islands
Harbour Island
Ballast Point
Hyde Park
Palma Ceia
Port Tampa
Ruskin
Apollo Beach
MEASURE THE SLIDER. THEN SLEEP THROUGH THE SEASON.
Book a free flood assessment. We measure every slider, door and opening on your property, tell you which ones carry the most risk, and build a system for the exact spans you have. No size charts, no guessing, no obligation.
Dam It Defense · 695 28th Street South, Saint Petersburg, FL · Serving St. Petersburg, Tampa Bay, and the greater Gulf Coast