Rockwool Board (Exterior CI): Complete Buying Guide 2026
Rockwool exterior board is a semi-rigid mineral wool insulation designed for continuous insulation (CI) applications outside the wall sheathing. It is non-combustible, drains water freely, and does not support mold growth. In 2026, rockwool board (exterior ci) prices average $2.20 per sq ft, with a typical range of $1.50 to $3.50 depending on your region, supplier relationships, and order quantity.
When budgeting for a project using rockwool board (exterior ci), factor in approximately 8% additional material for waste, plus labor costs averaging $1.50 per sq ft for professional installation. A typical project using this material runs approximately $5,500 including both materials and labor.
With an expected lifespan of 50 years, rockwool board (exterior ci) represents a cost of approximately $0.04 per sq ft per year of service life. This exceptional longevity makes it one of the most cost-effective materials when measured over its full lifespan.