Design, Layout & Living Space
Corkon and spray cork: the honest guide to cork van insulation

Written by
Martha
Martha writes about interiors, ownership stories, and the everyday realities of campervan life, with a focus on comfort, cost, and how vans are used over time.

There's a particular kind of misery that comes with a cold, damp van. You wake up on a clear winter morning, reach to open the blind, and find the inside of the window streaming with water. There's a dark patch on the cushion where it touched the wall overnight, the metal around the door is beaded with condensation, and somewhere behind your lovely cladding, you suspect, the same thing is happening where you can't see it, quietly. Anyone who has lived in a van through a British winter knows that the enemy isn't really the cold. It's the damp the cold brings with it.
Which is why, over the last couple of years, you'll have seen more and more van builds reaching for cork. Specifically, sprayed cork: a liquid coating, mixed with water and sprayed straight onto the bare metal, that dries to a soft, natural, biscuit-brown skin over every rib and corner of the van. Brands like Corkon have made it look almost magical in the build videos, a single product that insulates, soundproofs, stops condensation and looks beautiful, all sprayed on in an afternoon. It's natural, it's renewable, it's low-VOC, and it photographs wonderfully. It has become, fairly suddenly, the fashionable answer to van insulation.
So this is an honest look at it. Cork genuinely is a lovely material, and sprayed cork has a real and valuable place in a good van build. But it is not the thing a lot of people think it is, and if you buy it expecting it to be your insulation, you'll be disappointed and a few hundred pounds poorer. The truth is more useful than the marketing: cork is a brilliant supporting act and a poor leading one. Here's what it actually does, what it doesn't, what it costs, and how to use it well, written for someone who has to live in the van afterwards, not just film it.
What Corkon actually is
Let's start with the brand, because it's the one most people have seen and it's a good way into the wider subject.
Corkon is a real company, and if you guessed it was Australian, you'd be right. It was launched in 2023 by a founder named Stéphane, who adapted an existing French cork product (sold there as Soliege) for the Australian market. The product itself is a sprayed-on liquid cork: you get a bag of cork granules and binder, mix it roughly one-to-one with water, add a pigment if you want a colour, and spray it on with a gun fed by an air compressor. It is not cork sheets, not cork rolls, not the cork underlay you might put under a floor. It's a coating, applied wet and built up in thin layers.
Corkon's own headline figures are the ones you'll see quoted everywhere in this category: a thermal conductivity of around 0.039 W/mK, noise reduction of up to 19 decibels, impact-sound reduction of up to 40 per cent, a lab-tested lifespan of roughly ten years, and a strong environmental story, VOC-free, biodegradable, vegan, no biocides, with European test certificates cited for thermal performance, vapour permeability and fire reaction. It's marketed as something a competent DIYer can apply, though you do need the spray kit and a compressor to do it.
Two honest notes before we go further. First, for a UK reader, Corkon is a slightly awkward recommendation, because there's no evidence it's actually sold here. Its website talks about Australia, with a US arm, and the UK isn't mentioned. The good news is that it barely matters, because sprayed cork is a whole category, not a single product, and the figures Corkon quotes are essentially identical to the generic spray cork sold across Europe and, crucially, by several UK suppliers. So when we talk about "cork van insulation," treat Corkon as the well-known face of a product class you can buy here under other names. We'll come to exactly who to buy from.
Second, a small but useful warning: don't confuse Corkon with an unrelated American company called Cork Industries, which makes printing and packaging coatings and sometimes surfaces under similar search terms. Different business entirely, nothing to do with vans. It's the sort of mix-up that's easy to make when you're researching at midnight, and worth heading off.
The honest truth: cork is not your insulation
Here is the single most important thing in this whole article, and the thing the marketing is quietest about: at the thickness you actually spray it in a van, cork is not your insulation. It's a coating that does several valuable jobs, but bulk thermal insulation isn't really one of them.
The numbers tell the story plainly. Cork as a material is a decent insulator: solid cork board has a thermal resistance of roughly R3.6 to R4.0 per inch, genuinely comparable to sheep's wool and better than old-fashioned fibreglass. The trouble is the thickness. Sprayed cork goes on at around three millimetres, built up over two coats, with vendors suggesting three or four coats for really thorough coverage. Three millimetres is about an eighth of an inch. Even using cork's flattering board figure, an eighth of an inch works out at roughly R0.5, which is, to put it gently, almost nothing. To get a level of bulk insulation that would actually keep a van warm, you'd have to spray the cork an inch thick, which nobody does and which would cost a fortune.
You don't have to take a sceptic's word for it, either, because the cork suppliers themselves quietly concede the point once you read past the headlines. Corkon's own van page describes the product as something that "enhances the performance of other insulating materials," which is a careful way of saying it isn't the main one. A German spray-cork supplier states outright that the product "can be ideally combined with a natural main insulating material" like hemp or sheep's wool, again, not the main insulation, by the seller's own description. And VIPEQ, one of the established sprayed-cork systems available in the UK, openly calls its product a "thermal corrector" that reduces thermal bridges, rather than a bulk insulant. When the people selling it tell you it's a supporting layer, it's worth believing them.
It's worth being wise to the spec games, too, because this is an area where numbers get used to impress rather than inform. The thermal conductivity you'll be quoted for sprayed cork swings wildly depending on who's selling: 0.039 W/mK from one vendor, 0.058 from VIPEQ, and independent measurements reported on a building-science forum running anywhere from 0.068 to over 0.2, far worse. One building expert pointed out that vendors like to quote "K-value" precisely because it sounds technical and sidesteps a direct R-value comparison with normal insulation, which cork would lose on a per-millimetre basis. There was even a DIY thermal-imaging test in which the cork-coated side of a panel appeared to pass slightly more heat than the bare side, an awkward result for anyone selling it as insulation. None of this means cork is a con. It means cork is being mis-sold when it's pitched as the thing that keeps your van warm, and the honest figure to carry in your head is this: cork the material is around 0.035 to 0.040 W/mK, but a thin sprayed coat gives you only a fraction of a single R-unit, so it cannot be your insulation.
If that were the end of the story, this would be a short and rather negative article. But it isn't, because once you stop asking cork to be something it's not, you find it's genuinely excellent at a cluster of other things, and several of them are exactly what makes a van nice to live in.
So what is cork actually brilliant at?
Drop the idea of cork as insulation, and what you're left with is one of the best base layers you can put in a van. Here's what it does well, and why each one matters when you're the one sleeping in there.
The first and biggest is that it kills thermal bridges. This is the dull-sounding thing that quietly ruins most van builds. A van's body is a cage of steel ribs and folds, and rigid insulation board, however good its R-value, can never follow all those shapes. You cut boards to fit the flat bays, and around every rib, every curve, every awkward corner, there's a gap where bare metal still touches the inside of the van. Each of those gaps is a thermal bridge: a cold line where the outside temperature comes straight through, and, crucially, where warm interior air hits cold steel and dumps its moisture as condensation. Sprayed cork solves this beautifully, because it's a liquid. It goes everywhere, coating every rib and seam and tight corner that a board can't reach, putting a continuous skin of low-conductivity material between the warm inside and the cold metal. It doesn't add much R-value, but it breaks the bridges, and breaking the bridges is most of the battle against condensation.
Which brings us to the second thing, and the one that matters most for comfort: condensation control. By coating the bare steel, cork raises the temperature of that inner surface just enough, and continuously enough, to keep it above the dew point in most conditions, so warm air no longer hits an ice-cold panel and weeps all over it. And cork has a lovely additional trick here: it's vapour-permeable, or breathable. It resists liquid water but lets water vapour pass through slowly, which means it doesn't trap moisture against the metal the way a sealed plastic layer can. The steel can breathe, the moisture isn't held against it, and cork is naturally resistant to mould and mildew on top. For a van that has to survive British winters without quietly rotting from the inside, that combination, a continuous, breathable, mould-resistant skin over every bit of bare metal, is genuinely valuable.
The third is sound. This is the one you notice on the very first drive. Bare van panels are huge, thin, resonant sheets of steel that boom and drum over every surface and rattle at speed. Cork is a natural sound-deadener, and a sprayed coat noticeably calms that drumming, both the airborne road noise and the vibration of the panels themselves. The "up to 19 decibels" and "up to 40 per cent" figures are vendor numbers and the conditions aren't stated, so treat them as optimistic rather than gospel, but the underlying effect is real and well attested: a cork-coated van is a quieter, less tinny, more restful place to be, and quietness is a bigger part of feeling at home than people expect. If you've ever tried to sleep in a tin-walled van as rain hammers the roof, or winced at the boom of the back doors slamming on a rough track, you'll understand why this matters more than a spec sheet suggests. A van that doesn't drum and rattle simply feels more like a room and less like a vehicle, and that quiet psychological shift, from "I'm camping in a van" to "I'm at home, which happens to have wheels," is worth a surprising amount. Cork won't make a van silent, nothing will, but it takes the harsh edge off the noise, and on a wet night that's no small comfort.
The fourth is that it goes where nothing else will. Beyond the ribs, there are the cavities, the inside of the door skins, the box sections, the tight returns around wheel arches, places you simply cannot pack with board or batts. A spray reaches into all of them. The fifth is that it can be a finish in its own right: sprayed cork can be sanded smooth and left exposed as a warm, natural, slightly textured wall, or it can be clad and lined over later in the normal way. And the sixth, which we'll give its own section because it's a real selling point and an honest one, is the environmental story.
Notice what all six have in common. None of them is "it keeps the van warm." Every one of them is about making the van dry, quiet, healthy and pleasant to be in, the living-space stuff, the comfort stuff. That's the right way to think about cork: not as the duvet, but as the thing that makes the duvet work and the room nice.
The condensation problem, and why this matters so much
It's worth slowing down on condensation, because it's the reason most people end up looking at cork in the first place, and because getting it wrong is what turns a dream build into a damp, smelly disappointment.
A van is a sealed metal box, and you, as a living, breathing human who cooks and sleeps in it, are a small fountain of water vapour. A person gives off the better part of a litre of moisture overnight just by breathing; add a hot meal, a kettle, wet coats and a dog, and there's a remarkable amount of water in the air inside a small van. That warm, wet air goes looking for the coldest surface it can find, and in an uninsulated or poorly insulated van, that surface is the bare steel of the bodywork. The moment the warm air touches cold metal, it can't hold its water any more and the water condenses out, on the windows where you can see it and, far more worryingly, on the hidden metal behind your panelling where you can't. Left alone, that hidden condensation soaks into timber, breeds mould, rots fixings and rusts the van from the inside out. It's one of the most common and most expensive hidden faults in older vans, and it's exactly the sort of thing our guide to what to check when buying a used van or campervan warns you to hunt for, because by the time it shows on the surface, the damage behind the panels is usually well advanced. Prevention, in other words, is enormously cheaper than cure, and that's a large part of why thoughtful builders take cork and condensation so seriously: a few hundred pounds and a careful base layer now is a great deal less painful, and less expensive, than cutting out rusted metal in a few years' time.
Insulation alone doesn't solve this; in fact, badly done insulation makes it worse, by creating cold spots and trapping moisture against the metal. What actually beats condensation is a combination of three things: keeping the inner surfaces warm enough to stay above the dew point, not trapping moisture against the steel, and ventilating to get the water-laden air out. Cork helps with the first two directly. By skinning the metal in a continuous, low-conductivity, breathable layer, it raises the surface temperature and lets the structure breathe, which is exactly the right behaviour. It won't do the third for you, you still need proper ventilation and ideally a source of dry heat, but as a base layer in the war against damp, cork is doing genuinely useful work. This, more than any thermal number, is the honest case for it, and it's why so many thoughtful builders use it even though they know it isn't really "insulation."
The eco story, told honestly
Cork's environmental credentials are the part of the marketing that mostly survives honest scrutiny, and it's worth understanding why, because it's a genuinely good story.
Cork is the bark of the cork oak. The remarkable thing is that harvesting it doesn't kill, or even really harm, the tree: the bark is carefully stripped by hand and then grows back, ready to be harvested again on a cycle of roughly nine to twelve years. A cork oak isn't felled to produce cork; it's a renewable crop from a living tree that can keep going for two centuries or more, yielding perhaps sixteen to twenty harvests over its life. The forests themselves, mostly in Portugal and the wider western Mediterranean, are valuable carbon sinks and havens for wildlife, and they're economically valuable precisely because the trees are left standing, which is a rare and welcome alignment of money and nature. Processing cork is low-impact too, using comparatively little energy, water or chemistry, and the off-cuts are reused rather than wasted. The water-based spray-cork coatings are low or zero VOC, so you're not filling your small living space with off-gassing chemicals, and at end of life cork is biodegradable and recyclable.
A couple of the bigger numbers you'll see, like a tidy "thirty kilos of carbon dioxide absorbed per tree per year," are advocacy figures and worth treating as directional rather than precise. But the core of the story is solidly true: cork is a renewable, harvested-without-felling, low-impact, low-VOC, recyclable natural material, and if living lightly matters to you, it's one of the most honestly defensible things you can put in a van. Just don't let the warm glow of the eco story trick you into believing it's also keeping you warm. The two things are separate.
What it costs
Cork isn't cheap, and being clear-eyed about the cost is part of using it sensibly. Here are the real-world UK and European figures, with the honest caveat that you should treat any single number as a starting point and get a current quote.
| Option | Rough cost | Notes |
|---|---|---|
| DIY spray kit | ~£130 (around €154) | Spray gun, hopper, nozzles, some cork. Compressor NOT included. |
| Cork material | ~£70 to £80 per m² | The cork itself, sprayed at normal van thickness. |
| Full van (DIY material) | ~£400 to £600 | Cork material for a long-wheelbase van; you supply the labour and compressor. |
| Professional application | ~£40 to £100 per m² | Mostly based on house-render pricing; expect a premium for a van job. |
So for a typical long-wheelbase van done yourself, you're looking at something like four to six hundred pounds in cork, plus the kit, plus, and this is the catch people forget, a compressor capable of running the gun, usually something around a ninety-litre tank at three to four bar. If you don't already own one, you're renting or borrowing, and on a small van the equipment can genuinely cost more than the cork itself. Having a professional do it removes the hassle and the kit problem but adds a labour premium, and van work tends to sit at the upper end of the per-square-metre range because of all the masking and the fiddly shapes.
The value question follows directly from everything above. If you're paying four to six hundred pounds expecting it to be your insulation, that's poor value, because you're getting roughly half an R-unit for the money. If you're paying it for what cork actually delivers, a continuous, breathable, condensation-busting, sound-deadening, eco-friendly base layer over every awkward bit of metal in the van, then it can be money well spent. Same product, same price, completely different verdict depending on what you think you're buying. Get that framing right and the cost makes sense; get it wrong and you'll feel cheated.
Doing it yourself: what's actually involved
Sprayed cork is within reach of a competent DIYer, but it's messy, slow and a little more skilled than the videos make it look. Here's an honest walk-through so you know what you're signing up for.
You'll need the spray gun and hopper, the right nozzle (the kits come with a few sizes), and a compressor with enough puff to keep the gun fed. Then comes the part nobody enjoys: masking. Cork overspray goes everywhere, so every window, every bit of trim, every surface you don't want coated has to be covered thoroughly. The metal itself needs to be properly clean and degreased so the cork keys to it, because adhesion to a greasy panel is asking for trouble. Then you mix the cork with water (and pigment if you're colouring it), and spray, usually a thin first coat to grab the metal, followed by filler coats to build up the thickness.
Patience is the main ingredient. You're applying at least two coats, and three or four if you want really thorough thermal-bridge coverage, and you typically need to leave around twenty-four hours between coats, with full curing taking anywhere from a day to a week depending on conditions. Getting an even, consistent coat without runs, thin patches or a lumpy texture takes a bit of practice, and the first square metre will look worse than the last. When it's done and cured, you can sand it smooth with a fine grit if you want a tidy exposed finish, or simply leave it and clad over it.
The honest downsides of the DIY route, beyond the time: the compressor requirement is a real barrier, the overspray makes a mess that's tedious to contain, and the skill curve, while not steep, is real. None of it is beyond a determined amateur, but it's a weekend job done carefully, not an afternoon's magic, and if the idea of all that masking and curing fills you with dread, the professional route exists for a reason.
The best way to use it: cork and wool together
If you take one practical recommendation from this article, take this one, because it's where the theory turns into a van that actually stays dry and warm.
The smartest builds don't choose between cork and proper insulation. They layer them. Cork goes on first, sprayed directly onto the bare steel as a continuous, breathable, waterproofing base layer that breaks the thermal bridges and keeps the metal from sweating. Then a proper bulk insulant, most naturally sheep's wool, but PIR board, Thinsulate or closed-cell foam all work, goes on top to do the actual warmth-keeping. Cork handles the condensation and the bridges and the sound; the bulk layer handles the temperature. Each does the job it's good at, and neither is asked to do the job it's bad at.
There's a particularly clever reason this pairing works so well with wool, and it comes from real builders rather than a brochure. Sheep's wool is a wonderful natural insulator, but it has one weakness: if it gets damp and sits against bare steel, it can hold moisture against the metal and actually encourage it to rust. Spraying cork onto the steel first solves exactly that, putting a water-resistant, breathable barrier between the wool and the metal so the wool can do its job without quietly rusting your van. One well-documented overlanding build did precisely this, three coats of sprayed cork straight onto the steel as a waterproof base, then five to ten centimetres of sheep's wool on top, and reported the interior staying bone dry, with the only condensation appearing on the bare aluminium roof hatches the cork hadn't reached, after roughly five years of use including a trip to minus thirty-two in Norway. That's the honest proof of the concept: not cork alone working miracles, but cork in its proper supporting role making a wool build genuinely robust. It's the pattern to copy.
How cork compares
To put cork in context, here's how it stacks up against the other materials a UK converter usually weighs. The key is to read this as "what's each one for," not "which one wins," because the right answer is usually a combination.
| Material | Thermal value | Best at | Watch out for |
|---|---|---|---|
| Sprayed cork | Poor per mm (~R0.5 at 3mm) | Thermal bridges, condensation, sound, eco, awkward shapes | Not bulk insulation; needs compressor; cost |
| PIR / Celotex board | Excellent per mm | High R-value in flat bays | Leaves gaps and bridges around ribs |
| Sheep's wool | Good (~R3.6/inch) | Breathable, eco, moisture-buffering bulk | If damp against bare steel, can encourage rust |
| Thinsulate | Good (~R3.8 to 5.2/inch) | Easy, doesn't hold water, good sound | Cost; still leaves bridges if used alone |
| Armaflex / closed-cell | Real R, moisture-resistant | Self-adhesive, beats condensation, pro favourite | Less eco; cost |
| Carpet / felt lining | Negligible | Cosmetic finish, slight sound | Not insulation at all |
A few honest verdicts fall out of that. PIR board gives you far more warmth per millimetre than cork ever could, but it leaves thermal bridges around every rib, which is exactly cork's strength, so the two are complementary rather than rivals. Sheep's wool is cork's natural partner for the reasons above. Thinsulate is a strong, fuss-free all-rounder that cork can't match on thermal value per millimetre but can complement on bridges and sound. Armaflex is the choice of many professional converters because it's a genuine moisture-resistant insulator you stick straight on, and some builders use it almost exclusively; one converter's honest assessment rated cork as only "moderate, similar to wool, less effective in extreme climates and pricier than foil," and explicitly didn't recommend it as the primary insulation, which squares with everything here.
And then there's lining. It's worth being clear that cork sits underneath the decorative lining, not instead of it; the carpet, felt or wood you finish the walls with is cosmetic and does almost nothing thermally. If you're weighing up how to finish the inside once the cork and bulk insulation are in, our honest guide to carpet versus felt versus wood for campervan interior linings walks through the finish layer in detail. Cork can even be that finish itself if you sand it and leave it exposed, which is one of its quietly appealing tricks, but most builds still clad over it for the look they want.
UK options: who to actually buy from
Since Corkon itself isn't established in the UK, here's where a British builder can actually get sprayed cork, because the category is well served here under other names. The products are near-identical in spec, so the choice is really about DIY versus professional and about who's near you.
For the DIY route, the most concrete option is a UK-available spray-cork kit, such as the one sold by Combeing, which bundles the gun, hopper and nozzles with cork, leaving you to supply the compressor. For professional application, the UK has a healthy network: CorkRend offers "SprayCork" through approved applicators and specifically markets campervan work; Spray Cork UK is the sole UK distributor of the Spanish ReveCork system, applied by trained installers rather than sold for DIY; TIWI Cork Spray is the UK distributor and installer for VIPEQ; ECOPROCORK covers the UK and Ireland with the Decoproyec system; and Corksol is an established UK name in cork coatings. Regional applicators like Cork Spray South West will do camper vans too. The honest advice is to get two or three quotes, ask each applicator directly about van work specifically (it's different from rendering a house wall), and, if budgets are tight, weigh the cost of a professional job against simply doing cork-under-wool yourself.
Wherever you buy, the questions to ask are the same: how many coats and what total thickness; what they recommend you put over the top as bulk insulation; and what the realistic curing time is before you can start lining. A good supplier will happily tell you cork is a base layer, not the whole answer. If one tries to sell it to you as complete insulation on its own, that tells you something useful about the supplier.
Who it's for, and who it isn't
Cork suits a particular kind of builder very well. If you care about a dry, healthy, quiet van and about using natural, low-VOC materials, if your van has lots of awkward ribbed and curved metal that boards can't follow, if you're worried about condensation and rust behind the panels, and if you understand that you're buying a base layer to use alongside proper insulation rather than instead of it, then sprayed cork is a genuinely excellent choice and you'll be glad you used it. It's especially good for anyone planning a wool build, where the cork-on-the-steel-first trick is close to a no-brainer.
It's the wrong choice if you're expecting it to keep the van warm on its own, if you're on a tight budget and don't already have a compressor (the kit cost can swamp a small build), or if you'd rather a simpler, faster, stick-it-on solution like Armaflex or Thinsulate that does more of the thermal job in one step. There's no shame in any of those; they're just different priorities. As with most things in a van, it's not about which material is best in the abstract, but about which trade-offs suit the way you want to live and build. The people who love cork are the ones who used it for what it's good at. The people who regret it are the ones who asked it to be the insulation.
The verdict
Sprayed cork, whether it's Corkon or one of the UK equivalents, is a lovely, genuinely useful material that has been slightly oversold. As a base layer, it's close to brilliant: it skins every rib and cavity that boards miss, breaks the thermal bridges that cause most hidden condensation, lets the steel breathe so moisture isn't trapped against it, quietens the drumming of the panels, comes from one of the most honestly sustainable material stories going, and can even be left on show as a warm natural finish. For making a van dry, healthy and quiet to live in, it earns its place.
The honest caveats are simple and important. At the few millimetres you actually spray it, cork is not your insulation; it gives you a fraction of an R-unit, and even its makers describe it as a partner to a "main insulating material." The quoted thermal numbers vary suspiciously between sellers, so don't buy on the lambda figure. It costs real money, four to six hundred pounds in cork for a big van plus the kit and a compressor, and that's good value only if you understand what you're paying for. Use it the right way, sprayed onto the bare metal first as a breathable, bridge-busting base, with proper bulk insulation like sheep's wool over the top, and it's one of the best decisions in a thoughtful build. Use it the wrong way, as a magic one-coat insulator, and it'll let you down. As ever, the trick isn't finding a miracle material. It's understanding exactly what each thing does, and building the warm, dry van you'll actually want to wake up in. A sensible spare-payload check and a clear head about the options worth prioritising will serve you better than any single wonder-product.
Frequently asked questions
Is Corkon available in the UK?
There's no evidence Corkon sells directly in the UK; its site points to Australia, with a US arm. The good news is that sprayed cork is a whole category, and the UK is well served by near-identical products: DIY kits (such as Combeing's) and professional systems through CorkRend, Spray Cork UK (ReveCork), TIWI (VIPEQ), ECOPROCORK and Corksol, among others. So you can get the same thing here, just under different names.
Does spray cork actually insulate a van?
Not on its own, no, not at the thickness you spray it. At around three millimetres it gives you roughly half an R-unit, which is negligible as bulk insulation. Its real value is as a thermal-bridge breaker, condensation barrier and sound-deadener. Even the manufacturers describe it as something to combine with a main insulating material. Treat it as a base layer, not the insulation.
Can I use cork instead of insulation to save space?
This is the most expensive mistake people make with cork. It won't keep the van warm by itself, so using it instead of proper insulation will leave you cold and disappointed. If space is genuinely tight, you'd be better with a thin, high-performance bulk insulant; cork's job is to go underneath, not to replace.
How does cork stop condensation?
By coating the bare steel in a continuous, low-conductivity, breathable skin. That raises the surface temperature enough to keep it above the dew point in most conditions, so warm interior air doesn't hit ice-cold metal and weep. And because cork is vapour-permeable, it doesn't trap moisture against the steel, it lets the structure breathe, while resisting mould. You still need good ventilation, but cork is doing real work here.
What's the best way to use spray cork in a van?
Spray it directly onto the clean bare metal first as a breathable waterproofing base layer, then add a proper bulk insulant, sheep's wool is the natural partner, on top. The cork breaks the thermal bridges and stops the wool sitting damp against the steel (which can cause rust), and the wool provides the actual warmth. This layered approach is what experienced builders do.
How much does it cost to cork a van?
For a long-wheelbase van done yourself, expect roughly £400 to £600 in cork material, plus a DIY kit at around £130, plus a compressor if you don't own one (which on a small van can cost more than the cork). Professional application tends to run from around £40 to £100 per square metre, with a premium for fiddly van work. Get current quotes; figures move.
Is cork environmentally friendly?
Genuinely, yes, this is the part of the story that holds up best. Cork is harvested as bark without felling the tree, on a roughly nine-to-twelve-year cycle, from trees that live two centuries or more. Cork forests are carbon sinks, processing is low-impact, water-based spray cork is low or zero VOC, and the material is biodegradable and recyclable. Just don't let the strong eco story convince you it's also keeping you warm; those are two separate things.
Can I leave sprayed cork as the finished wall?
Yes. Sanded smooth, sprayed cork makes a warm, natural, slightly textured finish you can leave exposed, which is part of its appeal. Or you can clad and line over it in the usual way if you want a different look. If you're deciding how to finish the interior, our guide to interior linings goes through the options.
The reachable bit
It's telling that the most honest material in a van build is also one of the most quietly useful: cork doesn't pretend to be the hero, it just makes everything around it work better, keeps the damp at bay, and asks only that you understand what it's for. That's a good way to think about a whole van, really. The romance is in the trips, but the comfort is in the dull, careful layers underneath, the dryness, the quiet, the warmth done properly. And all of it, the van, the conversion, the materials, the time, adds up to a sum that puts the dream out of a lot of people's reach. That's exactly why Campervan.win exists, with capped entries so the odds stay honest, every cost published down to the line, £500 to a UK charity from every full draw, and a winner who drives away in a real van. A warm, dry place to wake up by the sea shouldn't only be for the few.
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About the author
Martha
Martha writes about interiors, ownership stories, and the everyday realities of campervan life, with a focus on comfort, cost, and how vans are used over time.
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A pop top roof can turn a big panel van campervan into a genuine four berth, add a quiet space to read or work, and make summer mornings feel properly restorative. It can also be noisy in wind, cold in winter, fiddly when wet, and surprisingly expensive. This guide looks at the real pros and cons, what the roof costs in the UK right now, how to keep it dry and healthy, and who will actually love living with one.

New & Noteworthy
29 min read
Will VW build a rugged, off-grid Transporter California? What it could be, and why it nearly already exists
The new VW California is lovely but it's a car-platform school-run shape. So will VW ever build a rugged, taller, off-grid Transporter-based one? We untangle the badges, and find it almost already exists.

Campervan Tech & Electrics
20 min read
VW's electric campervan: when it's really coming, and is the hybrid the smart buy now?
VW is building an electric campervan, but it's years off. When it's coming, what it'll be, whether the eHybrid is the smart buy now, and the honest truth about that 'all-night aircon' claim.

