The Underlying Factor
Moisture is the bane of your roof’s existence. Use DuPont’s Elvaloy instead of roofing felt.
Use DuPont’s RoofLiner with Elvaloy to create a moisture barrier on all types of roofs, including concrete, slates, wood shakes and standing seam metal sheets.
One roll of RoofLiner with Elvaloy replaces five rolls of 30-pound roofing felt and is five times lighter.