Fiber mat, method of making the fiber mat, and bituminous roofing product

A fiber mat comprises:

• a unitary assembly of fibers comprising at least a first set of fibers homogenous throughout the fiber mat and a binder comprising an organic resin, wherein the binder comprises at least a first binder, at least a second binder, or combination thereof, wherein the unitary assembly of fibers comprises a difference in the binder in a minority portion and a majority portion, wherein the difference in the majority portion and the minority portion is in binder composition, binder concentration, or combination thereof, wherein the minority portion is less than 50% by weight of a total composition of the fiber mat and is a plane parallel to a plane of the majority portion of the unitary assembly of fibers and wherein the fiber mat provides at least a 5% increase in tear strength when placed in a bituminous roofing product compared to an equivalent bituminous roofing product made with a fiber mat of equivalent weight containing a homogenous mat structure.