Foamed building board composite and method of making same

摘要

A sheathing board capable of transmitting water vapor while retaining good thermal conductivity properties. The board is formed of a core comprising rigid foamed plastic interspersed with spaced areas of water vapor permeable insulating material that extend from one major face of the core to the other. The major faces of the core are preferably faced with a water vapor permeable sheet, allowing water vapor to travel through the spaced areas of insulating material and the facing sheets. By aligning the spaced areas of material with the insulation in a wall cavity, the strength of the board and its thermal conductivity are maintained within acceptable limits.