Insulating material and methods of manufacture

Claim 1

A continuous insulating layer having at least one finished seam free of adhesive, staples, or other fastening means, which seam provides a vapor barrier, said layer being supported by supports 4-6 feet apart and running transversely of said seam, said layer and seam comprising: a. a longitudinal edge of a first resilient blanket of fibers comprised of glass bonded together and having a density in the range of about 1-2 lbs/cu. ft., said blanket being faced on the major face adjacent to said supports with a flexible vapor impervious facing sheet having an edge that essentially coincides with said longitudinal edge to form a first panel, said panel being semi-rigid to have minor sag when so supported, and b. a longitudinal edge of a second resilient blanket having the major surface adjacent to said supports faced with a vapor impervious facing to form a second panel having essentially the same characteristics as said first panel, said facing on said second blanket extending beyond said longitudinal edge to form a tab, the first and second blankets being butted together along said longitudinal edges such that the tab overlaps the facing on said first resilient blanket to form said seam, strip reinforcement means adhered to said tab and located on that portion of the tab contacting the facing on the adjoining blanket to provide the tab with greater resistance to sagging than the remainder of the insulating layer resulting in the tab being pulled closer against the facing of the adjacent panel to form said sealed seam, the width of said strip reinforcement means being greater than the width of said tab so that said strip reinforcement means overlaps a portion of said second resilient blanket.