Tightness & water column – watertightness parameters for covers
The terms "waterproofing " and " water column " are often used to describe the water resistance of covers, tarpaulins, or outdoor textiles. This value often causes confusion, especially when it comes to garden furniture covers—because a high water column does not automatically mean better protection.
What does "water column" mean?
The water column indicates the water pressure a material can withstand before water penetrates it. This value is measured in millimeters (mm). The higher the value, the more impervious the material is to standing water pressure.
- 1,000 mm → splash-proof
- 3,000–5,000 mm → waterproof in light rain
- 10,000 mm and above → completely waterproof, virtually impermeable to air
Waterproof, durable, breathable and equipped with UV protection: Covers from Wettertuete.de
Tightness of covers – more is not always better
When it comes to garden furniture covers, it is not just waterproofing that is important. A completely sealed cover without air exchange can trap moisture—with negative consequences such as condensation, mildew stains, or mold.
This is exactly where high-quality solutions from wettertuete.de come in: instead of relying on extremely high water columns, breathable materials are used.
More on this in the encyclopedia:
Breathability of covers
Comparison: High water column vs. breathable cover
| criterion | Very high water column | Breathable cover |
|---|---|---|
| Wasserdichtigkeit | Extremely high | Sufficient for rain & continuous rain |
| air exchange | Hardly present | Very good |
| Kondenswasser | High risk | Deutlich reduziert |
| risk of mold | Increased | Low |
| Suitability for garden furniture | Conditionally suitable | Optimal |
Why the water column alone is not decisive
- Rain rarely weighs down on coverings as standing water pressure.
- More important is the interplay between material, cut, and ventilation.
- Distance from the floor promotes air circulation
- Dry furniture under the cover is crucial
For more information, visit:
Ventilation
Waterproofing at wettertuete.de
The covers from wettertuete.de are designed to reliably keep out rain while remaining breathable. This prevents harmful moisture build-up, even when the cover is left on for long periods of time.
Especially for custom-made covers, we also have the option of taping the seams with seam sealing tape. This ensures maximum stability and tightness of the seams.
Frequently asked questions about water columns and waterproofing
What exactly does the water column indicate?
The water column describes the maximum water pressure that a material can withstand before water penetrates. It is measured in millimeters.
Is a high water column useful for garden furniture?
Not necessarily. Materials that are too dense can trap moisture, promoting mold and condensation.
At what water column is a material considered waterproof?
From around 3,000 mm, it is considered waterproof, although the intended use is decisive.
Why are breathable covers better?
They allow trapped moisture to escape, thereby reducing the risk of mold growth.
Are breathable covers sufficient in continuous rain?
Yes, provided that the furniture is covered with a dry cloth and there is sufficient distance from the floor.
Can condensation occur despite a high water column?
Yes. Condensation is caused by trapped humidity, regardless of the water column. Water often rises from the ground when the cover protects furniture on a lawn, for example.
Does the fit play a role in the tightness?
Absolutely. A well-fitting cover prevents water pockets and promotes rainwater drainage.
Where can I find suitable covers with optimal tightness?
Available from wettertuete.de – both as a standard solution and as a custom-made product.
Conclusion
The water column is an important technical benchmark, but should not be considered in isolation. For garden furniture, breathable covers with sufficient impermeability offer the best protection—without any moisture problems.
