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If you’re looking to have  your caravan or motorhome more energy-efficient, reduce utility costs, and enhance overall comfort, then we’ve got some insider tips for you. In this report, we’ll try to give an answer to most frequently asked question about extruded polystyrene (XPS) insulation, a popular thermal insulation choice among caravans and motorhome constructers.

Extruded polystyrene insulation offers indeed a range of advantages and is a proven excellent option for the construction of the so called “sandwich panels”. These panels generally consist of a rigid foam core (also known as the core layer material) and two outer facing materials (fiberglass, aluminum, wood, steel, etc.). The skin and core are then bonded together. Since these panels act as structural elements in motorhomes and caravans – and need to support a wide variety of loads as well as operate for longtime and in all weathers – the quality of the materials used to produce them is fundamental to the overall performance of the vehicle. From its exceptional thermal performance to its moisture resistance and durability, this foam insulation board has proven its effectiveness in creating energy-efficient and sustainable solutions.

What is Extruded Polystyrene Insulation?

Extruded polystyrene (XPS). The process of extruding foamed polystyrene results in a rigid material with uniformly small, closed cells and excellent insulation properties, making XPS thermal insulation materials the first choice for building sandwich panels.

RAVATHERM XPS foam boards, produced by Ravago Building Solutions are available in various mechanical strengths,  thicknesses,  and dimensions to perfectly match application’s needs..

Why XPS insulation?

There are several reasons to choose XPS thermal insulation for caravans and motorhomes. Here are five key advantages:

1.         Moisture resistance: Caravans and motorhomes can be exposed to moisture and condensation-related issues, which can lead to mold, mildew potentially effecting your health, and structural damage affecting vehicle longevity. RAVATHERM XPS is moisture resistant; meaning – even in extreme conditions – showing negligible water uptake. Thus making it an ideal choice to mitigate moisture-related problems for a healthy interior environment.

2.         Durable and long-lasting: XPS insulation is known for its durability and long lifespan. It is resistant to rot, decay, and, ensuring that it maintains its insulation & mechanical properties as well as integrity over time. The durability of XPS insulation means it can withstand the rigors of travel and various weather conditions, providing lifetime reliable thermal comfort & mechanical strength  for the caravan or motorhome .

3.   Lightweight and space-saving: XPS insulation is lightweight and keep this advantage over life time of vehicle, . Its low weight makes it suitable for mobile applications such as caravans and motorhomes. RAVATHERM XPS insulation boards have a high static and dynamic mechanical strength, allowing to minimize sandwich panels thickness & weight, resulting in vehicle’s weight saving and maximize inner usable space to live in and store goods .

4.         Excellent insulation properties: XPS (Extruded Polystyrene) insulation is known for its exceptional thermal performance. It has a high R-value, which measures its ability to resist heat transfer. RAVATHERM XPS effectively minimizes heat loss during winter and prevents heat gain during summer, creating a comfortable and energy-efficient living space inside the caravan or motorhome.

5.         Easy installation and versatility: XPS insulation is easy to cut, shape and install boards, . They can be fitted into any caravans or motorhomes panels,. RAVATHERM XPS can be used in combination with other materials, making it a versatile option for all design preferences.

Frequently Asked Questions:

IsExtruded Polystyrene Insulation Environmentally Friendly?

1. Environmental impact: Thermal insulation, such as that provided by XPS, is the most efficient and cost-effective way to achieve large energy savings and reduce CO2 emissions. RAVATHERM XPS’s combination of low density and high thermal insulation performance make it particularly effective.
2. Long-term benefits: the effect of using XPS as insulation material should also be analyzed in the long term. The energy efficiency payback from insulation with high R-values over a long period far exceeds any marginal contribution of ozone-depletion potential (ODP).
3. recyclability: RAVATHERMXPS products are up to 100% recyclable and can be re-used. They can either be recycled mechanically or by dissolution/depolymerization (under construction)

Is Extruded Polystyrene a good insulator?

Yes, XPS is considered a good insulator. It has excellent thermal insulation, its closed-cell structure minimizes heat loss, providing high levels of insulation performance. It helps maintain constant temperatures, improves energy efficiency, and reduces heating and cooling costs.

If you want to learn more about XPS and its performances, come and visit us at Caravan Salon in Düsseldorf: 25.08-03.09.23 – Hall 13 Standnr. C15

Rising energy costs have increased public awareness and interest in energy efficient solutions in all
areas of life. When manufacturers of motorhomes and caravans build the walls, floors and ceilings of their
vehicles, they need to choose a product that can withstand both a wide variety of loads and weathering
conditions over several years vehicle’s lifetime and be sustainable and energy-efficient as well.

The selection and quality of the materials used are critical for the overall performance and longevity
of the vehicle; as the core material within the composite panels plays an important role and has significant impact
on:

• insulation performance

• damp and moisture resistance

• overall assembly strength

• Cost/Energy efficiency.
  

Opting for XPS as the core layer material for composite panels means opting for long-lasting effective thermal insulation, because it is impervious to moisture and has low thermal conductivity.
But what many do not know is that even between XPS products there are performance differences. How is
this possible? The answer is actually very easy: Imagine you’d like to replicate a recipe of a yummy lemon cake you have eaten at your best friends’ house. You ask for the recipe, you get it, and after you have baked your cake following quantity and all steps, you think that somehow your cake does not have the same taste. Well, we are assuming that your cake will taste better… but nevertheless, it will not be the
same. Sometimes, even small differences can have a big impact on the results. In our case, to produce XPS the main differences can be summarized
as such:

1. Manufacturing technology: The process used to manufacture XPS foam can vary between different
   manufacturers, affecting the final properties of the foam. Factors such as extrusion equipment, temperature, pressure, and processing time can all affect the properties of the final product. Same way as for a cake: The oven, the oven temperature & cooking mode, some technologies can allow more homogeneous foam structures.
2. Raw materials: The raw materials used to produce XPS foam can vary between different manufacturers as well. While the basic chemical composition of the foam is the same, differences in the quality, or composition of the raw materials, in particular when significant amount of recycled material is used, will definitely affect the final properties of the foam – such as long-term mechanical performances & moisture uptake, VOC (volatile organic compounds) emissions.
3. Density & cells shapes: XPS foam can be produced in a wide range of densities and cells’ structures. Long terms fatigue resistance, in other words longevity of the vehicle’s body, is directly correlated to density. More mass = stronger providing it is evenly distributed in the cells’ walls. Cells’ shape and dimensions are reflecting the distribution of the solid parts in the cells’ walls. While density is quite easy to keep under control by manufacturers; consistently run to run producing appropriate closed cell structures is a very difficult art to master requiring strong manufacturing experiences and appropriate equipment to produce and measure.
4. Additives: XPS foam can be modified with additives to improve performances such as reaction to fire or/and thermal performances (Infra-Red blockers). Different manufacturers may use different additives or different amounts of additives.
5. Porosity: We talk here about XPS foam’s cell walls porosity, EPS bead structures and voids between the beads. Indeed, even if measured as closed cells, due to too thin walls, some foams could show very significant permeability to some gas: in particular moisture / vapor.

Yes, the vapor diffusion resistance of XPS (extruded polystyrene) thermal insulation can vary between different.

producers. Vapor diffusion is a measure of how easily moisture can pass through a material. The laws of physics is stating that as soon as we have a gradient of temperature between 2 sides of a panel, a vapor pressure difference is created inducing a vapor flow which will go from warm to cold side. In the case of XPS insulation, a high vapor diffusion resistance is desirable because it helps to significantly reduce moisture entering into the vehicle Sandwich panel. Opening the door to moisture is a certitude to shorten lifetime and comfort of the vehicle’s body by altering irreversibly mechanical structure and thermal performances.

Therefore, it’s important to consider a range of factors when selecting core materials to ensure that they will perform as expected in a given application during the lifetime of the vehicle.