Water-repellent, waterproof or watertight... What are the differences ?
When choosing cushions, protective covers or tents, you will often come across these three terms. Although they seem similar, they do not offer the same level of protection against rain. Here's how to tell them apart.
1. Water-repellent (the "water drop" effect)
This is the standard treatment for most of our garden cushions.
- The principle : The fabric receives a surface treatment that allows water to slide off it without immediately penetrating it (like water on a duck's feather).
- Protection : It can withstand a light shower or morning dew.
- Limitation : If water remains on the fabric for too long or if the rain is heavy, the fabric will eventually become saturated. The fabric remains breathable.
2. Waterproof (barrier)
- Principle : The fabric is tightly woven or coated to prevent water from passing through.
- Protection : It does not absorb water. It provides effective protection against normal rainfall.
- The limitation : Although the fabric is waterproof, water can eventually seep through over a very long period of time or under high pressure (particularly through the seams if they are not heat-sealed). Some waterproof fabrics remain breathable to limit condensation.
3. Waterproof (total blockage)
- Principle : It is an absolute barrier. Nothing gets through: no water, no air, no dust.
- Protection : Completely blocks external elements, even in the event of immersion or storms.
- Point to note : As air cannot circulate, there is a risk of condensation inside if there is no ventilation system (which can cause mould to grow on stored wood or fabric).
Sweeek's advice :
* Are your cushions water-repellent? Bring them inside in heavy rain.
* Is your cover waterproof? Check that it has vents to allow the furniture to breathe and avoid the greenhouse effect.
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