When Watertight Isn’t Watertight
What container owners should know about roof leaks, dents, and protective coatings.
Last month, we explored how condensation can develop inside an otherwise watertight shipping container.
But sometimes water really is coming through the roof.
We recently dealt with this problem on one of our own containers, and the experience taught us a few things worth sharing.
What We Discovered
- Container roofs aren’t completely flat. Their corrugated design and slight upward curve help direct rainwater toward the edges.
- Dents can change drainage. Our container has a roof dent more than a foot across. Water, dirt, and debris collect in that depression instead of draining away.
- Seams and edges deserve attention. The roof seams and areas where the roof meets the walls were among our problem areas.
- Surface preparation matters. Before applying an elastomeric roof coating, we had to thoroughly clean the roof, paying particular attention to the dirt-filled depression.
- Not all coatings are alike. Products have specific requirements for surface preparation, weather, drying time, and drainage. Some aren’t suitable for prolonged standing water.
What Happened Next?
After applying an elastomeric roof coating over the existing roofing caulk, we saw a significant improvement.
A roof that previously leaked badly has shown no further signs of water entering since the application.
That’s encouraging, but it doesn’t mean every roof can be repaired the same way—or that a coating will permanently solve a drainage problem.
One Important Safety Consideration
Shipping container roof panels can flex under concentrated weight. They aren’t conventional walking surfaces, and working on top of a container presents serious fall and injury risks.
Professional evaluation and appropriate access equipment are important when roof work is needed.
The Takeaway
A watertight container depends on more than its steel walls.
Roof condition, drainage, seams, and existing damage all affect how well a container protects its contents.
Understanding these factors can help owners recognize potential problems and make informed decisions.
Want to learn more about what we discovered, how elastomeric coatings work, and why the manufacturer’s instructions matter?
Read the Complete Article on Regenercrate
At Regenercrate, we believe informed customers make better decisions.
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