What is a U-value and how high should it be?

The U-value – also known as the thermal transmittance or insulation value – indicates how much heat passes through a material when there is a temperature difference on either side. It is measured in W/m²K (watts per square meter and kelvin).

Simply put: the lower the U-value, the better the insulation performance.

Thanks to many years of experience in attic staircases, Minka is an expert in high-quality insulation technology. The U-values of our attic staircases range between 0.2 and 1.3 W/m²K, depending on the model. With the matching ISO top cover, these values can be reduced even further.