Why you clean rendered walls (like K-rend)
1. Stops damage
Dirt, algae, and moss hold moisture.
Moisture = staining, cracking, and eventually render failure. Cleaning helps the wall dry properly.
2. Prevents permanent staining
If algae or pollution sits too long, it can etch or discolor the render, especially light colours. Early cleaning = no lasting marks.
3. Keeps it breathable
Modern renders are designed to let moisture escape. Heavy grime can clog the surface and reduce breathability.
4. Maintains appearance
Render shows dirt fast. Cleaning restores the original colour and finish without repainting.
5. Extends lifespan
Clean render lasts years longer, meaning fewer repairs and less money spent long-term.
6. Helps spot problems early
Once it’s clean, cracks, impact damage, or water ingress become obvious—before they turn expensive.
When you actually
need
to clean it
Green or black staining appearing
Patchy discolouration
North-facing or shaded walls
After 2–5 years, depending on location
When
not
to rush it
Very new render (must fully cure first)
If there are cracks or hollow areas (fix first)
