Final Verdict
For most UK campervan conversions, a combination of Roxul wool walls (£3-£5/m²) and XPS foam roof/floor (£8-£12/m²) provides the best balance of performance, cost, and ease of installation. For premium builds, add Aeroseal ceiling (£20-£30/m²) for maximum insulation in minimal thickness.
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UK Van Models Quick Comparison
| Van Model | Price New | Seats | Cargo Volume | Best For |
|---|---|---|---|---|
| Ford Transit Custom | £30K-£45K | 3 | 15m³ | Full conversions |
| VW Transporter T6.1 | £32K-£50K | 3 | 11m³ | Daily driver |
| Mercedes Sprinter | £35K-£60K | 3 | 19m³ | Luxury builds |
| Renault Master | £28K-£42K | 3 | 14m³ | Budget builds |
All prices UK new delivery. Used examples 2018+: typically £15-£30K.
UK Van Models Quick Comparison
All prices UK new delivery. Used examples 2018+: typically £15-£30K.
Good insulation is the foundation of comfortable UK van life. Without proper insulation, your campervan becomes an oven in summer and a freezer in winter. The UK's damp, maritime climate demands insulation that handles both heat retention and moisture resistance. This guide reviews the best insulation materials for UK van life in 2026.
Insulation Material Comparison
Wool Insulation (Roxul/Slater): At £3-£5 per m², wool insulation is the UK's most popular choice. It's fire-resistant, moisture-absorbent, and provides excellent acoustic insulation. R-value: 3.0 per 50mm. The main advantage: wool breathes, allowing moisture to escape and reducing condensation. Disadvantage: it's heavier than alternatives and absorbs moisture if not sealed properly.
XPS Foam ( Kingspan KoolDek): At £8-£12 per m², XPS foam is the most efficient insulant by thickness. R-value: 5.0 per 25mm, making it the thinnest option. It's waterproof, lightweight, and easy to install. The disadvantage: it's less breathable than wool, so adequate ventilation is essential to prevent condensation.
Spray Foam: At £15-£25 per m², spray foam provides the highest R-value (6.0 per 25mm) in a single application. It's waterproof, creates an airtight seal, and is easy to apply. The disadvantage: it's expensive, and professional installation is recommended. Once applied, it's permanent and difficult to remove.
Aeroseal: At £20-£30 per m², Aeroseal is the premium option. It's a 3mm closed-cell foam with a粘着 backing, providing R-value of 4.0 per 3mm. It's the thinnest option, perfect for vans with limited roof height. The trade-off: expensive and requires careful application.
Best Insulation for UK Van Life
For most UK vans, Roxul wool insulation at £3-£5 per m² offers the best balance of performance, cost, and breathability. For those who prioritise thinness over breathability, XPS foam at £8-£12 per m² is the better choice. For premium builds where every millimetre counts, Aeroseal at £20-£30 per m² delivers the highest performance in the thinnest profile.
Installation Tips
Wall insulation: Apply 50mm Roxul wool between van wall studs, covering with a moisture barrier if using non-breathable wall cladding.
Roof insulation: Apply 25-50mm XPS foam to the roof, sealing edges with Sikaflex to prevent air leaks.
Floor insulation: Apply 25mm XPS foam to the floor, covering with plywood or vinyl for a finished surface.
Ceiling: Apply 25mm Aeroseal or Roxul wool between ceiling bars.
