Builders within case study solution 1990s installed 8 inches R 25 to R 30 of loose fill Isoler Combles Perdus and likewise by case study solution entire year 2000, insulation levels had reached 12 inches R 38 . Today, depending on case study answer homes location, attics are being insulated with 16 inches of blown in fiberglass R 49 , cellulose, or shredded blue jeans. Yes, shredded blue jeans, Im severe, case study solution ripped up blue jeans were being installed in a wall as insulation. Attic insulation is energy effective in case study solution event you live in a cold local weather and youre continuing to keep case study solution warm in and in addition case study answer cold out, or perhaps you live in a warm climate and youre continuing to maintain case study solution cold in as well as case study solution warm out. Dark coloured, metal fiber performing insulation is certainly rock wool. A well-liked attic insulation inside case study answer 50s and 60s.