Fort Belvoir Military Base, located in Northern Virginia, is now home to a Polyglass multi-ply modified bitumen roof system. NV Roofing proposed the Polyglass system to replace a 60,000 square foot aged TPO roof. The new roof system features mechanically attached Polyglass G2 Base sheet, heat-welded Polyflex® smooth interply sheet and heat-welded Polyflex® G granulated cap sheet in white. The redundancy of a multi-ply roof system results in a longer roof service life and return on investment for the building owner.