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A method to study the forced in‐plane flow of an epoxy resin into fibrous networks is presented. A radial in‐plane flow apparatus has been developed which allows strict control of all important experimental variables as well as visual observation of the experiment. From the position and shape of the advancing resin front as a function of time, effective directional permeabilities are obtained and used to compare structurally different fibrous networks. Test results for an initial series of woven and nonwoven fabrics reinforce the method of data analysis and demonstrate the effects of pore structure, weave type, weave balance, fabric layering, fiber orientation, and compressibility.