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A study was undertaken at the Fiber Processing and Utilization Laboratory of the Fiber Industry Development Authority of the Department of Agriculture in the Philippines to evaluate the properties of Musa-fibers (low grade abaca MI and banana cv Saba) and their reactions to polyester resin and silicon-based fiberglass and utilize them as reinforcing material in polyester composites. Results showed that compatibility ratio of 1: 3 (polyester: fiberglass & fiber) provided uniform thickness/smoothness and did not exhibit delamination, wet binder spots and core misalignment in corrugated sheets as roofing material. Mechanical test results of the developed abaca fiber-reinforced composites such as internal bond (4.09-4.87 Mpa), tensile strength (80.5–87.0 Mpa) and flexural strength (595.25– 2172.05 Mpa) provided improved strength and substantial information on the potential of low-grade abaca fiber as reinforcement material (ASTM Test Methods). The cost of producing the composite material is 21.3％ lower than the commercial product of corrugated fiberglass sheets (2.97 sq. M or 4”x 8” span). It is assumed that replacement of the material would even cost 50％ less than the commercial product if further manipulation of the fiber-polyester compatibility will be done.