R-value is the measurement of how well insulation prevents the flow of heat in and out of a home. A greater R-value is better at preventing the flow of heat, but is generally more expensive.

Batt insulation is a type of insulation that comes in precut sections like a blanket. Typically made of fiberglass, but you may find them made with cellulose, mineral wool, or plastic as well.

While the cost varies from location and by type, generally speaking you can expect it to cost around $1-$2 per square foot.