Corotop® Thermo thermal insulation is available in two variants: Corotop® Thermo RED or Corotop® Thermo ALU: Corotop® Thermo RED or Corotop® Thermo ALU. Lambda is 0.022, which results in high thermal insulation. This solution has up to 50% less insulation thickness than classic solutions. It simplifies and speeds up installation, and is ideal for both new construction and renovations.