Hessian cloth-reinforced urethane acrylate-based thermoset composites were prepared by compression molding. The composition of the matrix solution was formulated with different concentrations of urethane acrylate ((F1: 55%, F2: 65%, F3: 75%, F4: 85%, and F5: 95%) in solvent methanol (44.5, 34.5, 24.5, 14.5, and 4.5%) along with thermal photoinitiator benzyl peroxide (0.5%). Mechanical properties of the composites were examined. It was found that F4 with 85% urethane acrylate-based composite showed the best results. The maximum value of tensile strength (TS), bending strength (BS), tensile modulus (TM), bending modulus (BM), and elongation at break (Eb%) were found to be 47 MPa, 61 MPa, 1250 MPa, 1550 MPa, and 9.38%, respectively, for F4-treated composites. Different intensities of radiation (100–500 krad) were applied on F4-soaked hessian cloth-reinforced composites. The mechanical properties of the irradiated composites were found to increase significantly compared with those of nonirradiated composites. The maximum TS, BS, TM, and BM for the treated composites were found to be 66 MPa, 84 MPa, 1882 MPa, and 2250 MPa, respectively, at 300 krad dose. Water uptake and soil degradation test of the composites were also performed.