Single Sided Foil Fiberglass Insulation Roll size: 4' * 125', 4' * 250' REFLECTIVITY: 95% ... radiant barrier & Sarking , Single Sided Foil Fiberglass Insulation Material Specifications:Product Name: Single Sided Foil Fiberglass Insulation MaterialMax Width: 1.83M or ... the use of mechanical cooling and heating in buildingsSafe to handle, quick and easy installationWater proof, no moisture retention, no ...