Patent ID: 8057881

Claim:
A fungi resistant, asphalt containing, roofing sheet material, comprising: a fibrous base sheet having a first major surface and a second major surface; the fibrous base sheet being a nonwoven spunbond or glass fiber mat; a first fungi resistant asphalt layer applied at an elevated temperature on the first major surface of the fibrous base sheet that is partially absorbed into the fibrous base sheet and allowed to cool and harden; the first fungi resistant asphalt layer containing a blend of two or more fungi growth-inhibiting agents comprising 2-(4-Thiazolyl) Benzimidazole and Zinc Pyrithione, which can withstand temperatures in excess of 150Â° C. for periods of up to about 12 hours without significant degradation, in amounts that result in the first fungi resistant asphalt layer having more fungi growth resistance than without the fungi growth-inhibiting agent and an odor-reducing additive in an amount sufficient to substantially eliminate odor that would otherwise be emitted by the first fungi resistant asphalt layer; and the fibrous base sheet having a Gurley Hill porosity of at least 20 to facilitate the partial absorption by the fibrous base sheet of the first fungi resistant asphalt layer and the fungi resistant, asphalt containing, roofing sheet material having a water vapor permeance no greater than 1.