Abstract: A roofing underlayment for placement over a roof substrate prior to the application of shingles, tiles or other roofing materials. The underlayment comprises a sheeting material having an upper surface and a lower surface. The underlayment contains a grid that is visually identifiable from above the underlayment when the underlayment is received over the roof substrate with its lower surface adjacent to the roof substrate. The grid assists in the alignment of the underlayment with the roofing substrate during application of the underlayment to the substrate and further assists in the alignment of roofing materials applied over the underlayment.

Abstract: A fibreboard, insulating, wall panel includes an integral air and vapor barrier of metal foil or metallized plastic film adhered to one surface of the panel. Panels are attached to a stud wall frame. Abutting panel joints are taped to provide a continuance vapor barrier. Increased thermal and acoustic insulation as well as structural integrity of the barrier is provided by the panel.