All materials
Original illustration
drywall
R-value
Also called r value
A measure of how well insulation slows heat. Higher is more insulation.
Why it matters to your home
R-19 is a common wall batt. The printed R is for the insulation when it is fluffy, not when it is crammed.
Products
R-19 fiberglass batt
A fiberglass blanket rated R-19 when it is not compressed.