customized size ground protection boards 10×10 for civil . customized size ground protection boards 10×10 for civil Engineering Roof Top Protection Board – Best Materials InsulLam Insulation Board, 1-1/2 inch with 5/8 inch OSB: InsulLam EPS Foam mposite Insulation Board, 4 x 8 Feet with 1-1/2 inch EPS Foam with a 5/8 inch OSB Board. ~R=5.5.