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This study examines the use of high protein biomass residuals as a partial substitute for formaldehyde based adhesives, combining the biomass with alternative fiber sources including papermill sludge and corn stover. Short-term in-vessel composting was used for biological drying, to reduce moisture and odor while minimizing fiber degradation. Resulting biomass-fiber mixtures were combined with 4 and 6% melamine urea formaldehyde adhesive and subjected to industry standard tests for modulus of rupture, modulus of elasticity, internal bonding strength, wet swelling, and formaldehyde emissions. Results demonstrate the effectiveness of biomass protein as a component of adhesive systems, and indicate considerable potential for combining these residuals into environmentally friendly building materials.