Radiant Barrier segmentation by type distinguishes five material families: Aluminum foil, Polymeric film, Reflective paint, Spray‑applied coating, and Composite systems. Aluminum foil, the most mature technology, accounts for roughly 45 % of volume sales because of its low cost, high reflectivity (>95 %), and ease of installation on pitched roofs. Polymeric film, typically a multilayered PET or PVC substrate with a metallic layer, captures about 30 % of market value, offering superior durability and flexibility for flat‑roof and HVAC duct applications. Reflective paint, comprising ceramic microspheres suspended in an acrylic binder, contributes near 15 % and is favored in retrofit projects where minimal surface preparation is required. Spray‑applied coatings, based on silicone or fluoropolymer chemistries, hold roughly 7 % of the market, providing seamless coverage for complex geometries but demanding higher skilled labor. Composite systems that integrate insulation cores with a reflective skin represent the remaining 3 %, targeting high‑performance green‑building specifications. The relative weight of each type directly influences manufacturing capacity, supply‑chain logistics, and pricing dynamics across the Radiant Barrier market.