Condensation is one of the most common problems in campervans, especially in the UK climate. If left untreated, it can lead to damp, mould, rust, and unpleasant smells.

In this guide, we’ll explain why condensation happens, how to prevent it, and the best materials to keep your campervan dry all year round.

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What Causes Condensation in a Campervan?

Condensation happens when warm, moist air meets cold metal surfaces inside your van.

Common sources of moisture include:

• Breathing (especially overnight)
• Cooking inside the van
• Wet clothes or gear
• Dogs or pets
• Rain and damp weather

Because vans are made of metal, they cool down quickly, making condensation more likely.

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Why Condensation Is a Problem

If not controlled, condensation can cause:

• Mould and mildew
• Rust and corrosion
• Damage to insulation and panels
• Unpleasant smells

That’s why preventing it properly is essential.

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How to Stop Condensation in a Campervan

1. Use GlassMAT XR or SOShield Vapour Barrier (Most Important)

The best way to stop condensation is to prevent moisture reaching cold metal surfaces.

SOShield insulation includes a foil vapour barrier, which:

• Blocks moisture
• Reflects heat
• Prevents condensation forming behind panels

👉 This is one of the most effective solutions available.

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2. Use UK Liner Closed-Cell Insulation (Not Absorbent)

Avoid materials that absorb water (like wool or felt).

Instead, use closed-cell foam insulation, which:

• Does not absorb moisture
• Dries quickly
• Prevents damp build-up

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3. Improve Ventilation

Ventilation helps remove moisture before it turns into condensation.

Simple steps:

• Open windows slightly
• Install a roof vent or fan
• Allow airflow when cooking or sleeping

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4. Insulate Key Areas Properly

Focus on areas where condensation forms most:

• Roof (largest cold surface)
• Walls and panels
• Doors
• Floor

Using insulation like SOShield across these areas helps maintain a stable internal temperature.

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5. Reduce Moisture Inside the Van

Small habits make a big difference:

• Avoid drying wet clothes inside
• Use lids when cooking
• Wipe down surfaces if condensation appears
• Keep bedding dry

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Best Setup to Prevent Condensation

For best results, use a layered approach:

1. PeaceMAT XR (optional sound deadening on metal)
2. GlassMAT or SOShield insulation (main layer with vapour barrier)
3. Proper ventilation

This combination:

• Stops moisture reaching metal
• Keeps heat inside
• Reduces condensation significantly

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Common Mistakes to Avoid

❌ Using absorbent insulation
❌ Skipping vapour barrier
❌ Poor ventilation
❌ Leaving gaps in insulation

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Final Thoughts

Condensation in a campervan is unavoidable - but it can be controlled.

By using the right materials like SOShield, improving airflow, and insulating properly, you can keep your van:

• Dry
• Warm
• Comfortable

All year round.