Find the right thickness for your desired R-value.
R-value requirements vary by climate zone and application (attic, wall, floor) — check your local building code for the recommended minimum before purchasing materials.
It's based on climate zone, the area being insulated, and recommended R-value guidelines for that zone and application.
It measures a material's resistance to heat flow — higher R-value means better insulating performance for a given thickness.
Colder climates need more insulation to prevent heat loss, while milder climates can use less and still maintain efficient homes.