< Back Total R value is the total of each and every element that makes up the construction of a building, and includes wall/ceiling/underfloor applications such as brick, plaster, internal air, cement sheeting and so on.

Added R value is what the Foilboard® Insulation Panel combined with the adjacent still reflective airspaces adds to a particular system. The actual amount of airspace adjacent to the material will have a profound impact on the R value – the larger the space, the higher the R value. If the airspaces are ventilated or classified as open the R values will not be very high at all.