Build-up Low Areas
Polyurethane Foam: A Permanent Structural Solution to Ponding
Because standing water is heavy, it gets deeper and heavier every year causing structural sagging. Foam is the only roofing material that can be used to fill ponds and enhance drainage. Closed cell polyurethane foam is the ideal material for filling low areas because it is waterproof and very light weight. Also, closed cell polyurethane foam does not soak-up water. In fact, closed cell polyurethane foam is used in the hulls of ships to provide added strength and buoyancy. Extra foam material is applied at low areas to displace serious amounts of standing water. By filling low areas, Dura-Foam provides a permanent solution to structural sagging caused by heavy ponds of water.How Low Areas are Filled
The images below are exaggerated cross sections of a typical roof structure which show how Dura-Foam applies additional closed-cell spray polyurethane foam to low areas of a roof surface to displace standing water.
Step 1: Fill low areas with closed cell (waterproof) foam.
Step 2: Apply an even layer of closed cell foam to entire roof surface.
