What is the r‐value for multi foil insulation?
The R‐value is the measure of the resistance to heat transfer. The R value has been around a long time, before foil insulation. The R‐value is a measure of the effectiveness of conventional mass insulation but it has no meaning in terms of reflective protection against radiant heat. Q: How is reflective insulation measured? A: As R‐values are used to measure the effectiveness of conventional insulation; Reflective and Emissive ratings are also used to measure the effectiveness of reflective insulation and radiant heat. A high Reflective value helps block more radiant heat and a low emissive value means the insulating material releases less of the heat that it absorbs. Better performing reflective insulation has foil layers made from almost pure aluminium; it has for very high reflectivity and very low emissivity as well as interleaving layers of conduction and convection insulation materials. Q: What is radiant heat and why does it matter? A: Radiant heat is energy like that from the s
