Foil insulation products target the three primary mechanisms that facilitate heat transfer; radiation, conduction and convection.The low-emissivity reflective layers within foil insulation function as an airtight barrier, reducing the chance of condensation in your build. Not only do these surfaces reflect heat back into your project in winter, but they also can control the amount of solar radiation entering the building in summer to make for a cooler, more comfortable living environment.The layers of wadding between these reflective surfaces serve to trap air; this is how multifoil rolls prevent conduction. Each roll has either a fibrous core (which reduces heat loss through convection and conduction) or a bubble-like structure (which contains pockets of air that reduce heat transfer).