Flame-resistant shield for protected membrane roofs
AssigneesDdp Specialty Electronic Materials US, LLC, Dupont Safety & Construction, Inc.
InventorsArash Sahbaee, Greg Stewart, Valentina Woodcraft
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Abstract
An inverted roof membrane assembly comprising: a) a waterproofing membrane suitable for direct or indirect mounting on top of a roof decking, b) at least one layer of the polymer foam insulation board directly or indirectly on top of a), c) a flame-resistant fabric shield directly or indirectly on top of b), said flame-resistant fabric shield having a water vapor permeability of 1.0 perm or greater; and d) a ballast layer directly or indirectly on top of c).
Claims15
An inverted roof membrane assembly comprising:
- a) a waterproofing membrane suitable for direct or indirect mounting on top of a roof decking,
- b) at least one layer of the polymer foam insulation board directly or indirectly on top of a),
- c) a flame-resistant fabric shield directly or indirectly on top of b), said flame-resistant fabric shield having a water vapor permeability of 1.0 perm or greater;
- and
- d) a ballast layer directly or indirectly on top of c);
- wherein the flame-resistant fabric shield comprises a nonwoven felt of staple fibers, wherein the nonwoven felt is a needle punched felt,
- the felt having:
- a water vapor permeability of 1.0 perm or greater,
- a basis weight of about 150 to 800 grams per square meter, and
- a thickness of about 1.5 to 6.0 mm;
- wherein:
- i) 20 to 100 weight percent of the total amount of staple fibers are re-purposed meta-aramid staple fibers;
- and
- ii) 0 to 80 weight percent of the total amount of staple fibers are crimped virgin meta-aramid staple fibers having a uniform cut length.
A flame-resistant fabric shield comprising a nonwoven felt of staple fibers, the nonwoven felt having
- a water vapor permeability of 1.0 perm or greater,
- a basis weight of about 150 to 800 grams per square meter, and
- a thickness of about 1.5 to 6.0 mm;
- wherein:
- i) 20 to 100 weight percent of the staple fibers are re-purposed meta-aramid staple fibers;
- and
- ii) 0 to 80 weight percent of the staple fibers are crimped virgin meta-aramid staple fibers having a uniform cut length.
Dependencies are inferred from the claim text.