Roofing underlayment

Details Roofing underlayment Roofing underlayment

E - Fixed Constructions

04

D

E04D 5/02 (2006.01) A47G 27/04 (2006.01) B32B 5/02 (2006.01) B32B 5/26 (2006.01) B32B 13/14 (2006.01) B32B 15/14 (2006.01) B32B 17/00 (2006.01) B32B 17/02 (2006.01) B32B 27/06 (2006.01) C03C 17/38 (2006.01) C03C 17/40 (2006.01) C03C 25/48 (2006.01) D06N 3/04 (2006.01) D06N 5/00 (2006.01) D06N 7/00 (2006.01) E04D 5/10 (2006.01) E04D 12/00 (2006.01)

Patent

CA 2392394

The present invention relates to a roofing underlayment system comprising two layers of a coated structural article which comprises a substrate having an ionic charge coated with a coating having essentially the same ionic charge or one layer of such coated structural article in combination with one layer of felt material. The coating of the coated structural article consists essentially of a filler material and a binder material wherein the binder material bonds the filler material together and to the substrate and wherein the coating does not bleed through the substrate. The roofing underlayment system of the present invention can impart a Class B or better (Class A) fire rating to a roof assembly.

L'invention concerne un système de doublure inférieure d'une toiture, qui est composé de deux couches d'un article structural pourvu d'un revêtement et comprenant un substrat dont la charge ionique est revêtue par un revêtement possédant la même charge ionique, ou bien d'une couche de cet article structural revêtu combinée à une couche de feutre. Le revêtement de cet article structural revêtu est constitué par un matériau de charge et par un matériau liant, ce dernier agglutinant le matériau de charge et le substrat, de sorte que le revêtement ne fuit pas à travers ce substrat. Ce système permet à une toiture d'obtenir une évaluation de résistance à l'incendie égale ou supérieure à une catégorie B (catégorie A).

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