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What is R-Value and is it important for insulating your vehicle?
R-Values.
An insulating material's resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value -- the higher the R-value, the greater the insulating effectiveness. The R-value depends on the type of insulation, its thickness, and its density.
Is higher R value better?
Look for the R-value. "R" means resistance to heat flow. The higher the R-value, the greater the insulating power. Almost all insulation products have to tell you their R-value — pipe and duct insulation are the only exceptions.
Do R values add together?
When calculating the R-value of a multilayered installation, add the R-values of the individual layers. Installing more insulation in your vehicle increases the R-value and the resistance to heat flow. In general, increased insulation thickness will proportionally increase the R-value.
Things to consider.
There are many factors that come into play when using R-values to compute heat loss. Manufacturer R-values apply only to properly installed insulation. Squashing two layers of batting into the thickness intended for one layer will increase but not double the R-value.
Is thicker insulation better?
The thicker the insulation, the better it works to reduce heat flow from the inside of your vehicle to the outside during winter, and from outside to inside during summer. ... Doubling the thickness of insulation will double the insulation's R-value, cutting heat loss in half.
Calculating heat loss.
R-value is measured in meters squared Kelvin per Watt (m2K/W).
The R-Value is calculated as R = l/λ where l = the thickness of the material in meters and λ (lambda) is the thermal conductivity of the material in W/m.K.
You can use this equation to figure out what is the best material to use when insulating your campervan.
Things to consider.
If you are confronted with thermal conductivity, R-values and U-values going forward, here are 3 simple things to remember, to make sure you get the best insulating product.
- Higher numbers are good when comparing the Thermal Resistance and R-Values of products.
- Low numbers are good when comparing U-Values.
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The U-Value is the most accurate way to judge a material’s insulating ability, taking into account all the different ways in which heat loss occurs, however it is more difficult to calculate.