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The feasibility of using organic fiber filler as reinforcing fibers for non-autoclaved foamed concrete composites is discussed in the paper. The aim of the research is to analyze the factors affecting the strength and thermal insulation properties of foamed concrete and fiber concrete. Moreover, the study purpose is to obtain correlations for predicting the technological properties of thermal insulation foamed concrete and fiber concrete mixtures. The results of studying the indicators of compressive strength, bending, and thermal conductivity of a foamed fiber concrete composition with organic fiber filler are presented. The optimal sizes and amounts of organic filler made of straw are determined. The introduction of 15-30% of the total mixture mass is the most effective. In this case, the compressive strength increases by 28%, and the value of the thermal conductivity coefficient decreases by 8% compared with the control samples.