Safe Exterior Cleaning for Roughcast & Rendered Walls
Pebbledash, also known as roughcast render, is a common exterior finish on homes and commercial buildings across Cornwall and Devon. While durable, pebbledash is highly prone to algae, moss, lichen, and staining — especially in the South West’s damp, coastal climate.
Cleaning pebbledash incorrectly can cause permanent damage, making specialist professional cleaning essential.
In this guide, we explain why pebbledash becomes dirty so quickly, why high-pressure washing is a mistake, and how professional pebbledash cleaning safely restores exterior walls across Cornwall and Devon towns.
Why Pebbledash Gets Dirty So Quickly in the South West
Cornwall and Devon create near-perfect conditions for organic growth on exterior walls:
- Frequent rainfall and high humidity
- Mild temperatures year-round
- Coastal salt air
- Shaded elevations and limited airflow
- North-facing walls that stay damp
Pebbledash’s textured surface traps moisture and dirt, allowing algae and lichen to embed deeply if left untreated.
The Risks of Cleaning Pebbledash Incorrectly
Pebbledash is not suitable for aggressive pressure washing.
Incorrect cleaning can lead to:
- Dislodged stones
- Cracked or weakened render
- Patchy or uneven appearance
- Water penetration behind the render
- Costly repairs or full re-rendering
Once damaged, pebbledash is difficult to repair invisibly — prevention is far cheaper than cure.
How Professional Pebbledash Cleaning Works
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Professional pebbledash cleaning uses soft washing techniques, not force.
Step 1: Wall & Render Assessment
We assess:
- Condition of the render
- Level of algae, moss, and lichen
- Any existing cracks or weak areas
Step 2: Specialist Biocidal Treatment
Professional cleaning solutions are applied to:
- Kill algae, moss, and lichen at the root
- Lift staining safely
- Prevent rapid regrowth
Step 3: Low-Pressure Rinse (Where Required)
A gentle rinse removes dead organic growth without disturbing the render.
Step 4: Ongoing Protection
Results continue to improve over time as weather naturally washes away remaining residue.
Why DIY & Pressure Washing Are a False Economy
DIY attempts often result in:
- Surface damage
- Stones being blasted out
- Algae returning within months
- Higher long-term repair costs
Professional soft washing cleans deeper, safer, and for longer.
Pebbledash Cleaning Across Cornwall
We provide specialist pebbledash cleaning services throughout Cornwall, including:
- Truro
- Falmouth
- Newquay
- St Austell
- Penzance
- Camborne
- Redruth
- Bodmin
- Wadebridge
- Liskeard
- St Ives
From coastal homes to shaded inland properties, professional cleaning restores appearance and protects your walls.
Pebbledash & Roughcast Cleaning Across Devon
We also provide pebbledash cleaning services across Devon, including:
- Exeter
- Plymouth
- Torquay
- Paignton
- Newton Abbot
- Barnstaple
- Bideford
- Tiverton
- Exmouth
Devon’s coastal and rural locations face the same algae challenges, making specialist cleaning essential.
How Often Should Pebbledash Be Cleaned?
For most properties:
- Every 3–5 years professionally
- More frequently in shaded or coastal locations
- Before repainting or property sale
Soft washing delivers long-lasting results without damage.
Why Choose Jet Power Pressure Washing?
Jet Power Pressure Washing provides specialist exterior cleaning services across Cornwall and Devon.
✔ Experienced with pebbledash & roughcast render
✔ Soft washing specialists
✔ Fully insured
✔ Surface-safe cleaning methods
✔ Reliable local service
We focus on protecting your property, not risking damage.
Request a Free Pebbledash Cleaning Quote
If your pebbledash walls are stained, green, or looking tired, professional cleaning can restore them safely.
👉 Contact Jet Power Pressure Washing today for a free, no-obligation quote for pebbledash cleaning in Cornwall or Devon.
Specialist cleaning helps:
- Restore kerb appeal
- Protect exterior walls
- Avoid costly repairs
- Extend the life of your render
