Roof insulation system

Claim 1

An insulation system comprising: (a) spaced roof joists having length and side and top surfaces; (b) support structures located between and supported by said roof joists; (c) a semi-rigid insulation blanket overlying said support structures and said roof joists; (d) said semi-rigid insulation blanket having front, back and side surfaces and length and width; (e) said semi-rigid insulation blanket having a vapor barrier on said back surface and between said support structure and said insulation blanket; (f) said semi-rigid insulation blanket having a series of predetermined recesses cut into said front surface; (g) said predetermined recesses providing hinges for laying said insulating blanket over said support structure and roof joists; (h) approximately U-shaped trough areas formed by said insulation blanket between some of said predetermined recesses; (i) a series of said blankets in side-by-side relationship with the widths of said blankets running approximately parallel to the lengths of said roof joists; (j) insulation material contained within and generally filling said trough areas; (k) said support structure including main support brackets and longitudinal support brackets; (l) said main support brackets being generally U-shaped and having base, side and flange portions; (m) said base of said support bracket being positioned between and transverse to said roof purlins; (n) said side portions extending vertically upward from said base of said support bracket; (o) said flange portions being attached to the upper end of said sides and being connected to said roof purlins; (p) said base of said main support bracket having length, two sides and a downwardly projecting stacking flange on both sides and running the length of said base; (q) said longitudinal support brackets being of one continuous piece and having length, two sides and two edges; (r) said two ends of said longitudinal support bracket having connecting means; (s) said longitudinal support brackets having downwardly projecting stacking flanges on both sides and running almost the length of said longitudinal support bracket; and, (t) said longitudinal support brackets being connected to said base of said main support brackets and being generally parallel to the length of said roof joists.