TekFoil Radiant Barrier Insulation Reflective/Kraft (R/K) Perforated makes all insulation better. It's perfect for uses in attics in addition to conventional insulation. TekFoil™ Radiant Barriers reflects 95% of the radiant heat waves and is only .05% emissive. Available perforated so you can use it if a vapor barrier is already in place. Class 1 material (15 Flame Spread and 0 Smoke Generation when tested to ASTM E-84). Discourages rodent nesting. TekFoil™ Radiant Barriers can also be used in the following applications: