I am often asked questions like –
- “How to insulate a camper van?”
- “What’s the best type of insulation to use for a camper van conversion?”
- “What’s the best way to insulate a van?”
So, I purchased a van to convert, a Volkswagon T5. After reading multiple blogs and info sites about how to insulate a camper van, some of the most popular methods are to use metallic bubble wrap, fiberglass insulation, and a plastic vapor barrier.
These all seemed very messy and offered a lesser outcome, that’s when we decided to put together this guide and offer some camper van insulation tips.
Although my van is a VW, as long as you understand these principles, it doesn’t matter what van you are insulating.
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1. Introduction – Insulating a Camper Van
You’ve made the first step…you’ve acquired a van and now want to convert it to something more luxurious than a tent!
First thing, after the planning step of course, is insulating your van, you might as well keep warm and dry if you’re not sleeping in a tent..! Insulation keeps heat in, excess heat out and reduces condensation.
If you splash out on a heater then this combined with a well-insulated van will give you the chance to dry out, both yourself and your kit, even after a few days of rain. In a camper van, it’s almost impossible not to produce lots of water vapour – everyone in the van breaths, every time you cook something you generate loads of steam – especially pasta etc. So, since there will always be excess water vapour in your van the thing to do is to try to stop as much of the water vapour as possible hitting the cold metal of the van and condensing.
The way to achieve this is to create a well-insulated room, thereby covering all the metal, with a vapour barrier between the main room and metal whilst doing your best to ensure that your van is well ventilated.
2. Why insulate a Camper van?
The combination of insulation, a vapour barrier, and ventilation keeps the moist air inside the van warm until it escapes to the outside.
The insulation fundamentally keeps the van warm whilst the vapour barrier prevents the water vapour getting to the cold metal and condensing. You want to avoid water on metal wherever you can – recite after me: water + metal = rust²!
When insulating your van, remember that ventilation is an equally important part of the equation as this allows the warm moist air to escape out of your van before the vapour has time to condense.
Don’t forget that the metal of your van is not the only cold surface, although the hardest to protect against, windows will also give water vapour a cold surface for condensing. Condensation on windows is easily protected against with our window insulation mats.
3. Where to start when insulating your Camper van
So, now we know why a camper van should be insulated… but how do you do it?
The main insulating materials available are normal housing insulation (either solid kingspan / celotex type board insulation, or something like glass-wool), thick foam (like thick swimming float material), but our favourite is high-spec reflective foil insulation with a closed cell foam core.
Don’t forget that you can use one material by itself or a combination of insulating materials depending on which part of the van you are insulating.
The best combination for DIY van insulation is:
- Bare metal
- Vapour barrier (a sheet of polythene will do, and note if you use the proper foil stuff you don’t need a vapour barrier as it acts like one itself).
- Plywood panel or cupboard etc. often covered with lining carpet which also helps with insulation and sound reduction.
The other thing the polythene / vapour barrier does if you’re using glass wool is keep all those fibres well sealed away from the air you’re breathing.
4. What About Using Traditional Products To For Camper Van Insulation?
We would always recommend using a combination approach to insulating your vehicle. Your options being either traditional housing insulation products or foil insulation, here are some pros and cons for you.
Traditional insulation products:
While fiberglass is a very good insulator, and it fits easily into awkward spaces, there are problems with its use. The main issue with fibrous products is that their microfibers can negatively affect indoor air quality. Not so good if you are sleeping in close quarters to the product, as in a camper van, however, if you cover it with a vapour barrier or even better with foil insulation, then this is less problematic. Glass wool is perfect for bunging in all the large cavities that you get in vans, plus it’s cheap, so this is a good product to start with.
Solid insulation boards are becoming more and more popular and there is no question they are great insulators, providing you have the space for them. The main reasons they’re not perfect in camper vans is often there isn’t enough space, and they are rubbish for going around curves, over struts, into small cavities etc..
Benefits of Low-E Foil Insulation:
✔ Reduces Road and Vibration Noise
✔ Non Toxic, No Fibres, No itching
✔ Flexible and Lightweight
✔ Quick and Easy Installation
✔ Rot Proof – No Rust or Mildew
✔ Class A / Class 1 Fire Rating
5. Using Foil Backed Insulation To Insulate A Camper Van
Foil insulation is easy to cut to size and folds effortlessly around difficult shapes like wheel arches or footwells. It works by reflecting heat as opposed to things like glass wool which absorbs heat.
Another huge advantage of foil insulation is that it’s so thin, easy to work with and works as a vapour barrier – a world apart from either stuffing glass-wool into gaps and then having itchy arms for a week, or trying to cut thick bits of board or foam to fit over awkward bits of the van and then realising your panels won’t fit back over the top!
6. Fitting Insulation in your Camper Van
Remove the existing panels on the ceiling, walls, and side and back doors (if they’re secured with poppers you can prise them out although some may break so take care). It is usually fairly easy to stuff glass wool insulation in behind these, then add a layer of foil insulation and replace the panels.
Areas behind units etc can be a little fiddlier. In some places you can’t reuse the original panels as you may need something stronger to secure cupboards to – in that case all you need to do is use the old panels as templates and cut new panels out of plywood.
The foil insulation we sell can be handled and installed without any safety equipment. It moulds easily around irregular shapes (of which there are MANY in vans) and cuts simply with a knife.
The insulation can be secured in place using high temperature spray adhesive – it is recommended that a small airspace is maintained between insulation and the finished panels of the vehicle. This provides the space required to reflect heat back into the vehicle. It isn’t worth getting too hung up on the air-gap issue as you are already using a really good product.
You can also use foil insulation in conjunction with traditional insulations to meet your needs, for example filling a space with glass-wool and then covering that with foil insulation which insulates and acts as a vapour barrier.
How Much Insulation Will You Need To Insulate a Van?
So that is my recommendations on how to insulate a van, please add your own thoughts and comments to our Facebook page. I would love to hear from somebody else who has fitted Low-E insulation to their camper van.