Insulation product with inward curling closure flap

A pipe insulation product comprising:

• a tubular core of insulating material, the tubular core comprising:
• a length and a longitudinal axis;
• a substantially cylindrical outer surface;
• a substantially cylindrical inner surface;
• and
• a wall extending between the cylindrical outer surface and the cylindrical inner surface, the wall having a radially extending thickness and a slit extending completely there through, the slit extending parallel to the longitudinal axis of the tubular core for the length of the tubular core;
• and
• a laminate that is roughly rectangular in shape and that is coextensive with and bonded to the substantially cylindrical outer surface of the tubular core and flexible so that the tubular core and laminate can be opened, placed about a pipe, and closed without degrading the laminate, wherein the laminate comprises:
• a polymeric film sheet forming an outer exposed layer of the laminate;
• a foil or metallized polymeric sheet material that provides a fluid vapor barrier to minimize fluid vapor transmission through the laminate;
• a scrim comprising a mesh of a plurality of fibers;
• a porous media sheet;
• and
• an adhesive, wherein the adhesive bonds the foil or metallized polymeric sheet material, the scrim, the porous media sheet, and the polymeric film sheet together to form the roughly rectangular laminate;
• wherein:
• the laminate comprises a closure flap configured to seal opposite sides of the laminate in a closed position so that the laminate forms a substantially cylindrical tube with at least a portion of the tubular core enclosed therein;
• and
• the closure flap is concave to provide a greater closure flap seal.