Vermiculite insulation is a pebble-like, pour-in product that is light-brown, gray, or gold, often with shiny flakes or small accordion-like pieces.
Use serrated blades or putty knives to gently remove foam insulation, and for tougher areas, use a power drill or grinder.
Calculate the amount of insulation by dividing your attic's square footage by the coverage area of the insulation package you plan to purchase.