Advanced Fiber Technology. AFT cellulose insulation is made from 85% post-consumer recycled newspaper and cardboard. The pulp is ground into a fine, fluffy powder, then treated with primarily boric acid and borax to render it fire resistant. The higher density of this cellulose insulation makes for a tight seal, second only to foam products in blocking air infiltration and sound deadening, says the company. The blown-in insulation provides an R-value of 3.8 per inch. 419.562.1337. www.advancedfiber.com.