Fiberglass is manufactured from sand and recycled glass, and rock wool is made from basaltic rock and recycled material from steel mill wastes. Rolls or blankets are also usually made of fiberglass and can be laid over the floor in the attic. Cellulose is usually made from recycled newsprint treated with fire-retardant chemicals. These boards are lightweight, provide structural support and generally have an R-value of 4 to 7 per inch. Rigid board insulation is made to be used in confined spaces such as exterior walls, basements, foundation and crawl space walls, concrete slabs and cathedral ceilings.
Ventilation plays a large role in providing moisture control and reducing summer cooling bills.
Attic vents can be installed along the entire ceiling cavity to help ensure proper airflow from the soffit to the attic to make a home more comfortable and energy efficient. Check your local building codes for recommendations. As specified on the product packaging, follow the product instructions on installation and wear the proper protective gear when installing insulation. The easiest and most cost-effective way to insulate your home is to add insulation in the attic. To find out if you have enough attic insulation, measure the thickness of insulation.