U-value calculation: how much insulation do you need?
Explore our handy reference guide detailing U-values for flat roof structures and the most commonly used insulation thicknesses.
Discover your ideal PIR insulation thickness
With Recticel PIR insulation, you can achieve excellent thermal insulation with less material. Using PIR, you can simplify structures and reduce the need for other building materials and their associated carbon dioxide emissions.
Download our handy guide and explore the pre-calculated U-values for the most common flat roof applications using the most commonly used insulation thicknesses.
You can also try our easy-to-use U-value calculator tailored to the EN ISO 6946:2017 method. It helps to calculate, how much PIR insulation you need for your project and how much carbon dioxide emissions it produces.
Download the U-value guide
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Understanding U-value
The U-value, also known as the thermal transmittance, indicates the thermal insulation capacity of different parts of a building.
By comparing the λ-values of different insulating materials, which represent their thermal conductivity, you can determine the amount of a specific type of insulation, such as polyurethane or mineral wool, needed to achieve the desired U-value in a structure.
Why low U-value matters
Low U-value insulation means a smaller overall carbon footprint. Minimizing the carbon footprint of the entire construction process is essential in combating climate change, and the choice of thermal insulation materials for the building also plays a part.
The material efficiency of polyurethane insulation allows for a smaller amount of insulation compared to other materials such as mineral wool. This reduces their carbon footprint in both production and transportation. Additionally, the use of resource-efficient PIR insulation reduces the need for other building materials and their associated carbon dioxide emissions during production and transportation.
Calculate U-value
With Recticel Insulation's U-value calculator, you can easily calculate the U-value of a flat roof structure according to the EN ISO 6946:2017 calculation method.
By calculating the precise U-value in advance, you can avoid ordering incorrect amounts of insulation, saving time and money.
Go to U-value calculator