Various thicknesses of polyiso insulation Great for crawl spaces, walls and under concrete slabs $10 per sheet 1.5" 4'x4' 64 pcs 1.75" 4'x4' 156 pcs 2.6" 4'x4' 30 pcs 1.5" 4'x8' 36pcs 1.75" 4'x8' 9 pcs Rockwool insulation 4'x4' 2" 79 pcs