How to Prep Your Home for Atmospheric River Events and Extreme Rain
Atmospheric rivers are massive corridors of moisture that stretch thousands of miles across the sky. When they make landfall, they can dump several weeks' worth of rain in just a few days—overwhelming drainage systems, saturating soil, and pushing water into homes that have never flooded before [1].
These events are becoming more frequent and intense across the United States, and they don't care whether your neighborhood has flooded in the past. FEMA flood maps are based on historical data, which means your "safe" zone might experience its first flood event during the next atmospheric river [3].
The practical reality: if you live anywhere that receives significant rainfall, atmospheric river preparation belongs on your radar. The difference between a stressful but manageable storm and a costly disaster often comes down to a few hours of targeted preparation.
This guide covers exactly what to do—from identifying vulnerable entry points to sealing them effectively with tools like FloodTape®, and knowing when you need additional measures beyond what any tape can provide.
Why Atmospheric Rivers Create Unique Flooding Challenges
Standard rainstorms come and go. Atmospheric rivers can stall over a region for days, creating conditions that even well-maintained homes struggle to handle.
Volume That Overwhelms Infrastructure
Your gutters, downspouts, and local storm drains were designed for normal rainfall patterns. Atmospheric rivers often deliver rainfall rates that exceed what these systems can manage. The result: localized flooding in areas where water typically drains without issue.
Prolonged Ground Saturation
Unlike hurricanes that pass through quickly, atmospheric rivers can deposit moisture continuously for 48 to 72 hours or longer. This prolonged saturation means the ground can't absorb more water. With nowhere else to go, it pools against foundations and seeks entry through any available gap [2].
Flash Flood Warnings and Rapid Water Rise
Atmospheric rivers frequently trigger flash flood warnings, meaning water levels can rise faster than most homeowners anticipate. A door that stayed dry during previous storms may suddenly have several inches of standing water pressing against it.
Important to understand: Even excellent preparation at entry points won't stop water that rises through porous basement floors or enters through foundational cracks caused by hydrostatic pressure from saturated soil. Sealing doors and windows addresses surface water intrusion—a critical first layer of defense—but severe, prolonged flooding may require additional measures like sump pumps with battery backups or professional-grade flood barriers.
Entry Points You Need to Identify and Protect
Water exploits every gap, crack, and unsealed edge. Before an atmospheric river arrives, walk your property and assess these common vulnerabilities.
Exterior Doors
The gap between your door and threshold is the most frequent entry point for floodwater. Even a quarter-inch gap allows gallons of water to pour inside when standing water builds against the door [4].
Check for:
Visible daylight under closed doors
Worn, cracked, or missing weatherstripping
Gaps around door frames where caulk has deteriorated
Doors that don't close tightly against the frame
Garage Doors
Garage doors present particular challenges due to their width and the rubber seal at the bottom that degrades over time. During extreme rain, water pools in driveways and flows directly toward these seals.
Common issues:
Cracked or hardened bottom seals
Corner gaps where the seal doesn't meet the floor
Side seals that have separated from the frame
Windows at or Below Ground Level
Basement windows and any windows close to ground level face elevated risk during atmospheric river events. Window wells can fill with water faster than they drain, creating pressure against window seals.
Assess:
Caulking condition around window frames
Window well drainage (gravel drains better than compacted soil)
Seal integrity on older windows
Vents, Pipes, and Utility Penetrations
Every location where something enters your home—dryer vents, HVAC penetrations, cable lines, pipe entries—represents a potential leak point that's easy to overlook until water finds it.
Your Pre-Storm Preparation Checklist
Time becomes your most valuable resource once an atmospheric river is forecast. This systematic approach covers both general flood preparation and specific entry-point protection.
72 Hours Before Expected Rainfall
General Preparation:
[ ] Monitor weather forecasts and atmospheric river tracking
[ ] Review your flood insurance policy and understand coverage gaps
[ ] Test sump pump if you have one (pour water in to trigger activation)
[ ] Ensure sump pump battery backup is charged and functional (power outages are common during these events)
[ ] Clear gutters and downspouts of debris
[ ] Verify downspouts direct water at least 6 feet from foundation
[ ] Clear nearby street storm drains of leaves and debris (blocked municipal grates cause neighborhood flooding)
Entry Point Assessment:
[ ] Inspect all exterior doors for visible gaps
[ ] Test garage door seal by spraying water at the base and watching for penetration
[ ] Check basement window seals and window well drainage
[ ] Inventory your flood protection supplies
48 Hours Before
Supplies and Setup:
[ ] Purchase or verify you have FloodTape® on hand (one 20-foot roll covers most standard doors)
[ ] Clean door frames and thresholds with a dry cloth (adhesive bonds best to clean, dry surfaces)
[ ] Photograph your property's current condition for insurance documentation
Interior Preparation:
[ ] Move valuable items away from basement and ground-floor exterior walls
[ ] Elevate electronics and irreplaceable items
[ ] Gather important documents in waterproof containers
24 Hours Before
Final Steps:
[ ] Apply FloodTape® to all vulnerable entry points (detailed instructions below)
[ ] Clear any remaining debris from drainage paths
[ ] Move vehicles to higher ground if applicable
[ ] Charge phones and backup batteries
[ ] Know where your water shut-off valve is located
[ ] Fill bathtub with water for emergency use if you're on well water or concerned about supply
How to Seal Entry Points with FloodTape®
FloodTape® is an 8-inch wide, 20-foot long waterproof adhesive tape designed specifically for temporary flood protection. Unlike duct tape or other improvised solutions, it creates a genuine watertight seal and—critically—removes cleanly without damaging paint, wood, or other surfaces [5].
The tape works on multiple surface types including wood, metal, glass, vinyl, stucco, and stone, provided surfaces are clean and dry before application [6].
Sealing an Exterior Door
Step 1: Prepare the surface.
Wipe down the door frame, threshold, and the bottom 10 inches of the door itself with a clean, dry cloth. Remove any dust, dirt, or moisture. The adhesive requires clean, dry surfaces for proper bonding.
Step 2: Measure and cut your tape.
For a standard 36-inch door, you'll need approximately 5 to 6 feet of tape to seal the bottom and sides effectively. Cut your sections before you begin applying.
Step 3: Start at the bottom threshold.
With the door closed, apply the tape horizontally across the bottom of the door and threshold, pressing firmly to create a tight seal. The 8-inch width allows you to cover both the gap and overlap onto the door and floor surfaces for maximum protection.
Step 4: Seal the sides.
Run tape vertically up both sides of the door frame, overlapping with the bottom piece at the corners. Press firmly along all edges to ensure complete adhesion.
Step 5: Inspect your work.
Look for any gaps or areas where the tape isn't fully adhered. Press down any loose spots. A complete seal requires attention to corners and overlapping sections.
Sealing a Garage Door
Garage doors require more tape due to their width, but the process follows the same principles:
Clean the floor and bottom edge of the garage door thoroughly
With the door closed, apply tape across the entire bottom edge
Seal the corners where the door meets the side frames
For additional protection, run tape along both side edges where the door meets the frame
Sealing Basement Windows
For windows at or below ground level:
Clean the window frame and surrounding wall surface
Apply tape around the entire perimeter of the window, overlapping at corners
If the window has a well, consider applying tape to the top edge of the window well wall where it meets the house foundation
Removal Instructions
When the storm has passed and water has receded, proper removal technique matters.
Pull the tape back slowly toward you at a 45° angle or lower. This angle allows the adhesive to release cleanly from the surface without pulling up paint or leaving residue. Take your time—rushing or pulling straight outward increases the likelihood of surface damage.
For best results:
Start at one corner of the taped area
Pull slowly and steadily, maintaining that low angle
If you feel resistance, slow down further rather than pulling harder
Work methodically until all tape is removed
Real-World Scenarios: Before and After
Scenario 1: The Garage That Stayed Dry
A homeowner in the Pacific Northwest had experienced minor garage flooding during previous heavy rain events. Water would seep under the garage door, soaking stored items and damaging drywall at the base of interior walls.
Before: Each heavy rain meant wet floors, damaged belongings, and several days of drying with fans.
After applying FloodTape®: During an atmospheric river event that dropped 4 inches of rain in 36 hours, the garage floor remained completely dry. The tape held against several inches of standing water in the driveway for over 24 hours. Upon removal, no residue remained on the concrete floor or the painted garage door.
Scenario 2: The Rental Property Challenge
A property manager in Arizona faced recurring flood damage at a rental unit during unexpected monsoon storms. Previous attempts with sandbags were partially effective but created muddy messes and didn't fully prevent water intrusion.
Before: Flood damage required weeks of repairs, carpet replacement, and tenant displacement.
After applying FloodTape® to doors and low windows before a subsequent storm: The tape held back approximately 2 feet of water for 24 hours without penetration. Upon removal, there was no damage to door frames or paint—important for a rental property where appearance affects tenant satisfaction and property value [7].
Scenario 3: Historic Home Protection
A homeowner with a 1920s home featuring original wood doors and trim faced a difficult choice: protect against flooding or preserve irreplaceable architectural details. Previous use of duct tape during storms had pulled off varnish and required expensive restoration.
After using FloodTape®: The product sealed effectively around the antique wood door, keeping water out during heavy rains. More significantly, removal caused no damage to the original wood or finish—a result that addressed the homeowner's primary concern [8].
Understanding What FloodTape® Can and Cannot Do
Honest assessment of any flood protection tool helps you prepare appropriately.
FloodTape® works well for:
Sealing doors, windows, and vents against rising surface water
Protection against standing water up to several feet when properly applied
Situations requiring quick deployment and clean removal
Entry points on various surface materials (wood, metal, glass, vinyl, stucco, stone)
You'll need additional measures when:
Water levels are expected to exceed 3 feet (consider professional flood barriers)
You're in a flash flood zone with rapidly moving water (tape cannot resist strong currents)
Your foundation has structural cracks (those require professional repair)
You're dealing with sewer backup (that requires backflow prevention devices)
Prolonged ground saturation creates hydrostatic pressure that can push water up through basement floors
The smart approach is layered protection. FloodTape® seals your entry points, while proper drainage, functioning gutters, grading that directs water away from your foundation, and sump pumps with battery backups all work together. No single product handles every flood scenario.
Preparing Your Small Business
If you operate a street-level shop, ground-floor office, or warehouse in a flood-prone area, atmospheric river preparation carries additional stakes. Beyond property damage, you're facing potential inventory loss, business interruption, and customer impact.
Priority areas for businesses:
Front entry doors and display windows: Storefronts sit at street level where water collects first
Loading dock doors: Large openings often overlooked until water has already entered
Utility rooms: Electrical panels and HVAC equipment at ground level need protection
Storage areas: Anywhere you keep inventory or important business documents
The same FloodTape® application techniques work for commercial properties. For businesses with multiple entry points or larger openings, the 6-pack bundle provides coverage for several doors and windows [9].
Long-Term Atmospheric River Preparedness
Immediate preparation matters, but building resilience over time protects you across multiple seasons.
Seasonal Maintenance Checklist:
Before rainy season:
Inspect all seals and weatherstripping on doors and windows
Clean and test drainage systems
Stock FloodTape® (maintains effectiveness for up to 24 months when stored in a cool, dry location) [10]
Review and update flood insurance coverage
Test sump pump and replace battery backup if needed
Monthly during active season:
Monitor weather forecasts and atmospheric river tracking
Verify supplies remain accessible
Test sump pump operation
After major events:
Assess any new vulnerabilities that appeared
Replace used materials
Document what worked and what needs improvement
Photograph any damage for insurance records
Take Action Before the Next Alert
Atmospheric rivers aren't going away. Climate research indicates these events are becoming more frequent and more intense in many regions [11]. The question isn't whether you'll face extreme rain—it's whether you'll be prepared when it arrives.
A roll of FloodTape®, clean surfaces, and 30 minutes of your time can be the difference between a dry home and a costly cleanup. Combined with proper drainage, functioning sump pumps, and awareness of your property's vulnerabilities, you're building genuine resilience against whatever the weather brings.
Ready to protect your home? Buy FloodTape® now and have it on hand before the next atmospheric river makes landfall.
Frequently Asked Questions
How much FloodTape® do I need for a typical home?
For most single-family homes, one to two rolls of FloodTape® (each roll is 8 inches wide by 20 feet long) will cover primary entry points including front and back doors. If you have a garage door, basement windows, or multiple vulnerable entry points, consider the 6-pack bundle to ensure complete coverage without running short during an emergency. Measure your entry points in advance and add 20% for overlapping at corners.
Can I apply FloodTape® to wet surfaces?
No. FloodTape® requires clean, dry surfaces for proper adhesion. This is why preparation timing matters—apply the tape at least several hours before heavy rain begins while surfaces are still dry. If you're applying during a storm and surfaces are already wet, dry them thoroughly with towels before application. Attempting to apply on wet surfaces significantly reduces effectiveness.
How long can FloodTape® stay in place during an event?
FloodTape® is designed for temporary protection during flood events. While it can effectively hold against water pressure for extended periods—some users have reported success over 24 hours or more—it's meant to be removed after the immediate threat passes. For protection extending beyond a single storm event, consult with flood mitigation professionals about more permanent solutions.
Will FloodTape® work on my textured stucco exterior walls?
Yes. FloodTape® adheres to stucco along with wood, glass, metal, vinyl, and stone surfaces. For heavily textured stucco, press firmly along the entire tape surface to ensure it conforms to the texture and creates a complete seal. The key is ensuring the surface is clean and dry before application—textured surfaces may require extra attention during the cleaning step.
What's the difference between FloodTape® and regular waterproof tape?
Standard waterproof tapes like duct tape weren't designed for flood protection. They often fail under sustained water pressure and almost always leave sticky residue or damage surfaces when removed. FloodTape® features patent-pending adhesive technology specifically engineered to resist water intrusion while releasing cleanly from surfaces—a combination that standard tapes cannot match. The 8-inch width also provides significantly more coverage than typical utility tapes.
About This Guide
This guide was created by the team at FloodTape®, a company founded by Matthias Herzog after 15 years of personal experience with flooding in hurricane-prone St. Augustine, Florida. After trying sandbags, duct tape, silicone caulk, and numerous other methods—each with significant drawbacks—Herzog developed FloodTape® as the simple, effective, damage-free solution that homeowners actually need. Every recommendation in this guide is grounded in real-world testing and feedback from customers who have successfully protected their homes during actual flood events.
Works Cited
NOAA — "What Are Atmospheric Rivers?" https://www.noaa.gov/stories/what-are-atmospheric-rivers
Scripps Institution of Oceanography — "Atmospheric Rivers." https://cw3e.ucsd.edu/atmospheric-rivers/
FEMA — "Flood Map Changes and Flood Risk." https://www.fema.gov/flood-maps
U.S. Department of Energy — "Air Sealing Your Home." https://www.energy.gov/energysaver/air-sealing-your-home
FloodTape® — "FAQ: What surfaces does FloodTape® adhere to?" https://www.myfloodtape.com/faq
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