How to Choose the Best Insulation for Campervan

Feeling lost with van insulation? Don’t worry, we break down the top methods so you can confidently choose the best insulation for your campervan & lifestyle

9/20/20238 min read

The Life-Threatening Choice When "Experts" Speak Freely

Part 3: Entering the world of campervan insulation is like walking straight into a jungle, opinions flying at you from all directions. Everyone claims to know the "best" method, leaving you scratching your head, wondering who to trust. Even my engineer friends and I still debate this stuff over coffee. Let’s be real: we’re insulating a metal box on wheels, not building a log cabin in the Alps.

But here’s the empowering part, you get to choose what works best for your van and lifestyle. Our job? To help you cut through the noise and make informed decisions.

Rather than letting conflicting advice stall your progress, think of it as a buffet of options. Below, we’ll walk through the three most common insulation methods out there. Learn the strengths, weaknesses, and best practices for each and you’ll be well on your way to a warm, dry and peaceful van.

Let’s Talk About the Real Threat – Condensation

Condensation is a big issue in van conversions and something you need to understand before choosing insulation.

What Is Condensation?

Condensation happens when water vapour in the air meets a cold surface and turns into liquid. Picture a cold beer glass on a hot day – that same moisture buildup happens inside your van when warm air hits cold metal.

Why Does Condensation Form in Vans?
  • Temperature shifts – e.g. from driving with heating on to parking overnight

  • Breathing, cooking and wet clothes – they all add moisture

  • Poor ventilation – traps humid air

Hur Åtgärdar Man Kondensproblemet?

Här är några effektiva sätt att hantera och förebygga kondens i din campervan:

  1. Ventilation:

    • Installera takluckor eller ventilationssystem för att säkerställa att fuktig luft kan komma ut och att frisk luft kan komma in.

    • Öppna fönster eller dörrar under dagen, speciellt efter att du har lagat mat eller om du har haft mycket aktivitet inuti bilen.

  2. Avfuktare:

    • Använd en avfuktare för att dra ut överflödig fukt från luften. Det finns bärbara avfuktare som är effektiva och lättanvända.

  3. Isolering:

    • Se till att din isolering är korrekt installerad och skyddad. Använd ångspärrar för att förhindra att varm, fuktig luft tränger in i isoleringen, vilket minskar risken för kondens.

  4. Torr Förvaring:

    • Undvik att förvara fuktiga kläder eller utrustning inuti bilen. Låt dem torka innan du tar in dem.

  5. Använd Fuktabsorberande Material:

    • Placera fuktabsorberande produkter, som silica gel-påsar eller speciella fuktabsorberare, inuti bilen för att minska fuktnivåerna.

  6. Regelbunden Inspektion:

    • Kontrollera regelbundet för tecken på fukt eller mögel, och åtgärda eventuella problem omgående.

How To Combat Condensation:

  1. Ventilation: Roof fans, cracked windows, and passive airflow

  2. Dehumidifiers: Small 12V models or moisture-absorbing crystals

  3. Proper insulation: Always with a vapour barrier

  4. Dry storage: Keep wet gear out or sealed

  5. Moisture absorbers: Silica gel, salt bags, etc.

  6. Routine checks: Look for damp patches, mould, or mildew

Why It Matters:

  • Mould and mildew: Bad for your health and difficult to remove

  • Material degradation: Can weaken insulation and wood

  • Bad air quality: A stuffy van is not a fun van

Take condensation seriously – it's silent, sneaky, and seriously annoying if ignored.

Sammanfattning

Kondens kan vara en tyst men farlig fiende i din konverterade skåpbil. Genom att förstå hur och varför kondens bildas kan du vidta åtgärder för att förebygga det och skydda din investering.

Med rätt ventilationslösningar, isolering och avfuktning kan du njuta av en bekväm och hälsosam miljö i din campervan, oavsett väder! Så se till att du har en plan för att hålla fukten i schack – din campervan kommer att tacka dig för det!

water droplets on clear glass
water droplets on clear glass
green leafed plant at the edge of cliff
green leafed plant at the edge of cliff

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The Search for the Perfect Insulation

Time to Make the Big Choice

The Search for the Perfect Insulation

Choosing insulation is about more than just keeping warm. It’s about finding a solution that fits your van layout, your budget, and your skill level. There’s no one-size-fits-all answer, only the setup that’s right for you.

oacen
oacen
Camper van winter
Camper van winter
Hitta Din Egen Isoleringsstil

Att välja rätt metod för isolering handlar om att förstå dina behov och vad som passar din livsstil och budget bäst. Oavsett om du är en hängiven DIY-entusiast eller bara vill ha en enkel och effektiv lösning, finns det en metod som är rätt för dig.

Kom ihåg att isolering handlar om mer än bara att hålla värmen – det handlar om att skapa en komfortabel och inspirerande plats att kalla hem, oavsett var vägen tar dig. Så sätt på dig verktygsbältet, använd sunt förnuft och börja isolera din campervan till perfektion! Din framtida själ är värd det, och kanske kan du till och med bjuda in några vänner att följa med på dina äventyr!

Obs, tänkt på att bilen är konstruerad för att hantera en viss mängd av både luftflöde och kondens genom vissa kanaler och ihågligeter. Så var försiktig och tänkt till innan du börjar isolera!

Campervan near sea
Campervan near sea

1. The Loose-Fill Method – Flexible & Affordable

Materials:

  • Wool: Natural, breathable, moisture-resistant, and effective at temperature regulation. A great eco-friendly option that can still perform even when damp.

  • Fibreglass wool: Widely available and budget-friendly, but handle with care – it's itchy and irritating without gloves and a mask.

  • Rock wool: Heavier than fibreglass, but highly effective at both thermal and acoustic insulation. Also fire-resistant, making it a safe choice.
    __ __ ____ ___ ___ ___ __


Installation:

Start by sealing off window frames and doors to prevent airborne fibres and dust from settling in. Then fill every cavity in your walls, ceiling, and floor structure with your chosen material. Be sure to include a vapour barrier to avoid moisture penetration and mould. For floors, some builders also add grooved mats to direct moisture to existing drainage points.

Pros:
  • Ideal for tight and irregular spaces

  • Excellent thermal and soundproofing properties

  • Affordable and widely accessible

Cons:
  • Can absorb moisture if not sealed properly

  • Requires full PPE to avoid skin and lung irritation

  • Settles over time if loosely packed

2. The Board Method – Rigid & Reliable

Materials:
  • XPS boards: Lightweight, moisture-resistant, and easy to cut – commonly used for floors and flat wall sections.

  • Polyurethane foam boards: Offers superior insulation per thickness but can be harder to cut cleanly and usually costs more.

    __ __ ____ ___ ___ ___ __

Installation:

Measure each panel area, cut the boards accordingly, and use adhesive or screws to fix them in place. Seal all joints with aluminium foil tape or expanding foam. For best results, combine with soft insulation in awkward corners.

Pros:
  • Very efficient in terms of thermal insulation (high R-value)

  • Creates flat, solid surfaces for furniture mounting

  • Relatively easy for confident DIYers

Cons:
  • Not flexible – challenging to install in curved sections

  • May off-gas – ensure proper ventilation

  • Can rattle loose if not tightly fixed

3. The Spray Method – Seamless but Pricey

Materials:
  • Spray polyurethane foam: Typically comes in dual-can kits or is applied professionally using large tanks
    __ __ ____ ___ ___ ___ __

Installation:

Apply directly to clean surfaces using a spray gun. The foam expands rapidly to fill cavities and sets hard. Be sure to work in a ventilated space with full protective gear. Avoid spraying areas where future wiring or fixtures will go unless pre-planned.

Pros:
  • Fills every nook and cranny

  • Acts as both insulation and vapour barrier

  • Excellent sound dampening

Cons:
  • High initial cost, especially for pro installs

  • Once it’s cured, it’s nearly impossible to remove or adjust

  • Overexpansion can deform panels if not applied correctly

two people holding hans and readning a book
two people holding hans and readning a book
campervan stearing in winter
campervan stearing in winter

Time for Action

Let’s Get Practical with Your Van Insulation

city walk night
city walk night
Girl enyoing the sea at the back of campervan
Girl enyoing the sea at the back of campervan

1. Planning and Preparation

  • Sketch your intended van layout, noting where each utility (electricity, water, etc.) will go

  • Strip out factory trim, panels, old flooring, and clean all metal surfaces

  • Rust-treat bare metal, especially inside window frames or behind structural ribs

  • Wipe everything down with degreaser for maximum adhesion

  • Install vibration-reducing mats for noise reduction

sleeping in campervan winter
sleeping in campervan winter
lightning in campervan
lightning in campervan

Insulating Your Campervan Step by Step

Converting your van is more than just materials – it’s about order, logic, and knowing which part to tackle first. Here’s how to approach your insulation like a pro:

2. Roof First

  • Start at the top while the van is still easy to move around in

  • Use spray foam for full coverage, or boards + foil insulation taped in place

  • Always finish with a vapour barrier if your insulation material doesn’t already act as one

3. Walls
  • Fit insulation between metal ribs, using foam or flexible wool for hard-to-reach areas

  • Seal all gaps, and leave channels open where needed for airflow

  • Consider using battens on top of the insulation to create a mounting base for wall panels

4. Floor
  • Use 1–2 cm XPS sheets between structural ridges

  • Add a vapour barrier and overlay with 9–12 mm plywood

  • Finish with a hard-wearing top layer like vinyl, rubber, or laminate

5. Windows and Doors
  • Use tailored reflective thermal covers or DIY window pads made from insulation foil and fabric

  • Seal draughty edges with rubber trim or weather stripping

6. Ventilation

  • Crucial for long-term comfort and mould prevention

  • Install a roof vent (manual or powered) and/or window deflectors

  • Plan intake and exhaust placement to ensure airflow throughout the van
    __ __ __ ___ ___ ___ __ _ __

7. Interior Finish
  • Choose your finish material (wood slats, carpet lining, etc.) and cut to fit

  • Install with screws into battens or adhesive depending on insulation method

  • Add cabinets and fittings afterwards, ensuring they don’t compress the insulation

8. Test and Adjust

  • Run your hand along walls and ceiling on a cold day to spot temperature differences

  • Use a thermal camera to find gaps

  • Patch, tape or fill weak spots before final cladding goes on

Our Campervan Insulation Strategy

When we built our own campervan, we wanted a method that balanced insulation performance with ease of installation and low risk of moisture buildup. Here’s what we chose:

Floor:
  • 1 cm of XPS between floor ribs

  • Topped with 2 cm full layer XPS

  • Vapour barrier, plywood sheets, and heavy-duty vinyl flooring on top

Walls and Roof:
  • Thermo-foil layered with closed-cell foam

  • Sprayed adhesive held everything in place before cladding

  • Focused on minimising ceiling thickness to keep headroom

Windows:
  • DIY window covers made from insulation foil and fabric

  • Velcro attached, rollable, and surprisingly effective in winter

girls drinking coffe in campervan enyoing van life
girls drinking coffe in campervan enyoing van life

Final Thoughts – Insulation Is the Foundation of Comfort

Whether you're chasing winter sun or parking up in a snowy forest, proper insulation makes vanlife 10x more comfortable.

There’s no single "perfect" method – just the one that best suits your build, your tools, and your budget. Make it safe, make it practical, and most importantly – make it yours.

Now grab your tools, throw on a playlist, and start insulating your dream van. The road (and warmth) awaits!