WIP 200 is used as shingle underlayments on critical roof areas like eaves, ridges, valleys, dormers and skylights. WIP membranes protect roofing structures and interior spaces from water penetration caused by wind driven rain and ice dams. WIP 200 is a composite membrane consisting of fiberglass reinforced rubberized asphalt laminated to an impermeable polyethylene film layer, providing dual barrier moisture protection.