Keep your whole home comfortably insulated with the help of Johns Manville. Johns Manville kraft-faced formaldehyde-free™ fiber glass insulation is paper-faced to help control moisture in concealed applications such as exterior walls. Our rolls are designed for long, unobstructed spaces with 16-in on-center stud spacing and will not rot, mildew or deteriorate. JM is a partner of the Seal and Insulate with ENERGY STAR program and our insulation is SCS Recycled Content certified.