A watertight shipping container is essential for anyone using containers to store goods, tools, or equipment. Whether you’re using a container on a construction site, for home storage, or as part of your business operations, water intrusion can lead to costly damage, mould, and structural decay. Fortunately, with a few simple checks and the right maintenance practices, you can ensure your container stays sealed and reliable, rain or shine.
Why Waterproofing Matters
Shipping containers are built to be tough. However, exposure to the elements over time, especially in harsh climates, can compromise their ability to keep out water. Leaks may start small but quickly lead to rust, damaged flooring, or even ruined inventory. Taking steps to maintain a waterproof shipping container will protect both the structure and everything stored inside.
What Makes a Container Wind and Water Tight?
A wind and water-tight steel shipping container has been inspected and certified to have no holes, cracks, or seal failures that allow light, air, or water to penetrate. While these containers may show signs of cosmetic wear, their structural integrity and seals remain intact. They’re ideal for safe storage and often more affordable than brand-new units.
To ensure your container is wind and water tight, pay close attention to the areas most prone to leakage: the roof, doors, and floor.
Step 1: Inspect the Roof for Weak Points
The roof is a container’s first line of defence against rain and snow. Start by visually inspecting the entire roof for rust patches, dents, and pooling water. These issues can compromise the steel and eventually lead to leaks. Use a ladder for a closer view, and check that water runs off easily rather than collecting in dips or low spots.
If rust is visible, remove it with a wire brush and apply a rust-inhibiting primer or protective coating. Don’t ignore minor blemishes, they often become major problems if left untreated.
Step 2: Examine Door Seals and Hinges
Next, test the doors by opening and closing them fully. A watertight seal depends on properly functioning doors. Look closely at the rubber gaskets or seals that run along the door edges. If they are cracked, brittle, or missing, they’ll need to be replaced immediately.
Also, ensure the hinges and locking mechanisms move freely. Rusted or stiff hinges can prevent doors from sealing tightly, which allows water and wind to slip through during storms or high winds.
Step 3: Inspect the Floor from the Inside
From the interior, check for water stains or signs of mold on the container floor, especially along the corners and door threshold. These signs indicate past leaks. If your container is placed directly on the ground, make sure it’s slightly elevated or positioned on a foundation to prevent ground moisture from seeping in.
You can use pressure-treated timber, concrete blocks, or metal supports to elevate the container and promote drainage.
Step 4: Seal All Openings and Gaps
If you detect gaps, pinholes, or minor cracks, seal them using a waterproof silicone or polyurethane sealant. For large repairs, use metal patches and container-grade sealants to reinforce the surface. Ensure all seals are applied cleanly and allowed to cure fully before exposure to rain.
Applying an anti-condensation coating on the ceiling can also help prevent interior moisture build-up, which leads to mold even if the container is technically sealed from outside water.
Step 5: Test for Light and Water
After sealing, perform a simple daylight test. Close the container doors during daylight and stand inside. If you see beams of light, you’ve likely missed a hole or gap. At night, you can also have someone shine a flashlight from the outside while you look from within.
To test for leaks after rainfall, step inside the container and check for any wet patches, drips, or streaks along walls and doors.
Step 6: Keep the Roof Clear of Debris
Leaves, branches, and standing snow can trap moisture and accelerate corrosion on the roof. Make it a habit to clear the roof regularly, especially after storms or seasonal changes. This simple task significantly extends the lifespan of a watertight shipping container.
Trust Valley Containers for Watertight Storage Solutions
A properly maintained container gives you peace of mind, knowing your belongings are secure from moisture, pests, and temperature swings. Whether you’re buying new or used, Valley Containers ensures every unit meets or exceeds standards for a wind and water-tight shipping container.
Contact us today to learn more about our container rentals and the for sale containers. You can walk away with the storage solution you need today!