mineral wool

Does Lowes Sell Rockwool? At $0.50 per square foot, 640 square feet of insulation costs $320 compared to $397 for rock wool insulation at $0.62 per square foot. How much does Rockwool cost? At $0.50 per square foot, 640 square feet of insulation costs $320 compared to $397 for rock wool insulation at $0.62 per