| 摘要 |
An insulated roofing system is provided in which a waterproof membrane is applied to the roof deck. Extruded panels of closed cell polystyrene foam are provided on top of the membrane, thus protecting the membrane from thermal cycling, ultraviolet rays, and physical damage. The foam panels provide excellent insulation and are resistant to water. A waterproof plastic film is bonded to the undersurface of each panel positively to exclude water. The foam panels are cut mechanically or are grooved to provide on the upper surface integral ribs spaced by channels. Concrete panels are said directly on top of the polystyrene foam and rest gravitationally on the ribs. The ribs provide for ventilation and moisture removal on hot, dry days. Removal of water vapor is enhanced by the increased area exposed to the ambient environment and derived from the cratered surfaces generated by cutting sections out of the foamed plastic panels. The composition, texture, and the physical contour or configuration of the cut surfaces bounding the cut grooves or channels formed in the foam plastic panels enhance the dissipation and dispersion of moisture, as compared with surfaces covered with a dense skin such as is produced upon generating the channels in an extrusion process. |
