1,Excellent vapor barrier 2,water-proof;moisture-proof 3,15-30 degree of temperature cooling ... size, weight and colour are available 1. press resistant, 2.water-proof ,sun-resistant,anti-aging, tear proof.3.antifreeze, corrosion ... /25mm400TDN/25mm400ElongationMD%23TD%21Peel StrengthN/25mmInterior layer3.3Exterior layer3.7Permeability2000mm water column,2hImpermeable aluminium foil roof insulation