Garage Door Insulation 21 x 16ft Reflective Foam (1 Panel) R8 2 Car Size

5mm (1/4inch Thick) CLOSED CELL POLYETHYLENE FOAM: enclosed between two layers of radiant reflective 100% aluminum. Strong lightweight yet durable material that is easy to cut and install and can be stapled or nailed into any surface without compromising the insulation barrier EFFECTIVE THERMAL RADIANT BARRIER: Reflects 98% of radiant energy (heat) with a thermal resistance. Prevents heat from escaping during colder and does not allow heat to enter during the summer months. WATER RESISTANT: while being an effective humidity and moisture barrier as well. Can be used in outdoor and indoor applications. SOUND REDUCTION: Effectively reduces sound travel creating a soundproof environment Can reduce the inside garage temperature up to 20 degrees in summer and turn it into a comfortable working environment.