Abstract: A paper or plastic surface material of appropriate thickness and stiffness which can be coated with or laminated to asphaltic or non-asphaltic adhesives. The surface material can have a plurality of individual slits formed in substantially parallel spaced rows extending transversely from one end to the opposing end of the surface material. The flexible surface material is expandable by extending the opposing ends of the surface material whereby the slits form an array of openings. The length, width and spacing of the cuts can be varied to achieve desired stretch ratios. The surface material can be easily stored in the non-expandable position and easily expanded to be stretchable and conformable around windows, skylights or other suitable uses.

Abstract: A paper or plastic surface material of appropriate thickness and stiffness which can be coated with or laminated to asphaltic or non-asphaltic adhesives. The surface material can have a plurality of individual slits formed in substantially parallel spaced rows extending transversely from one end to the opposing end of the surface material. The flexible surface material is expandable by extending the opposing ends of the surface material whereby the slits form an array of openings. The length, width and spacing of the cuts can be varied to achieve desired stretch ratios. The surface material can be easily stored in the non-expandable position and easily expanded to be stretchable and conformable around windows, skylights or other suitable uses.

Abstract: A two-dimensional foil having slits that allow the foil to convert into a three-dimensional lathe by stretching out the lathe so that the slits form pockets or openings. The lathe is made of a foil that can have a plurality of individual slits formed in parallel spaced rows extending transversely from one end to the opposing end. The foil is expandable by extending the opposing ends of the foil in a lengthwise or widthwise direction, whereby the slits form an array of openings. The length, width, spacing, number of the cuts and the extent of staggering between the rows can be varied. The two-dimensional foil can be easily stored in the non-expandable position in a roll form, allowing inexpensive and easier handling and transportation.