The only limitation is that BIBS insulation must be installed by a cer­tified BIBS contractor. There are currently about 300 licensed installers in the United States and another 400 in other parts of the world.9 The loose-fill insulation also must be fully compatible with The Blow-In-Blanket System. As with any loose-fill insulation prod­uct (see Chap. 7), dishonest installers can even “fluff” BIBS insula­tion by installing it at lower density than disclosed to the homeowner.