Underlayment material
An underlayment material made of a laminate of a nonwoven thermoplastic fabric having a dimensional stability of less than 1% when exposed to a temperature of 82° C. when tested in accordance with ASTM D 1204 in both machine- and cross-directions and a thermoplastic barrier layer provides a combination of an improved dimensional stability, resistance to sliding along a roof deck and protection as a moisture barrier when used in roofing and flashing structures.
1. An underlayment material made of a laminate of a nonwoven thermoplastic fabric having a dimensional stability of less than 1% when exposed to a temperature of 82° C. when tested in accordance with ASTM D 1204 in both the machine- and cross-directions and a thermoplastic barrier layer, the underlayment material being in compliance with Section 5.2.1 of AAMA 711-13.
2. The underlayment material of claim 1 , wherein the nonwoven fabric is selected from the group consisting of polypropylene, polyethylene, polyester, and combinations thereof.
3. The underlayment material of claim 1 , wherein the nonwoven thermoplastic fabric comprises at least one additive selected from the group consisting of a color pigment, an inorganic filler, an ultraviolet light stabilizing agent and an anti-oxidation stabilizing agent.
4. The underlayment material of claim 1 , wherein the thermoplastic barrier layer comprises at least one material selected from the group consisting of polypropylene, polyethylene, an elastomeric resin, polyurethane and polyamide.
5. The underlayment material of claim 1 , wherein the thermoplastic barrier layer is extrusion-coated onto the nonwoven thermoplastic fabric.
6. The underlayment material of claim 1 , additionally comprising a second nonwoven thermoplastic fabric laminated to the thermoplastic barrier layer.
7. The underlayment material of claim 1 , additionally comprising a second thermoplastic barrier layer laminated to the nonwoven thermoplastic fabric.
8. A roofing structure comprising a laminate of a nonwoven thermoplastic fabric having a dimensional stability of less than 1% when exposed to a temperature of 82° C. when tested in accordance with ASTM D 1204 in both the machine- and cross-directions and a thermoplastic barrier layer mechanically attached to a roofing material.
9. The roofing structure of claim 8 , wherein the laminate has zero measurable slide down a roof deck having a slope of 26.6° when a weight equivalent to an average person is applied thereto.
10. The roofing structure of claim 8 , wherein the roofing material is selected from the group consisting of shingles, tiles, metal roofing and concrete.
11. A flashing structure comprising the underlayment material of claim 1 mechanically attached to a building structure.