Non-porous breathable waterproof PET fabrics were prepared by a UV coating of UV-curable polyurethane diacrylate (PUA) formulations. The performance of the monolithically coated fabrics was affected by the type of UV lamp, UV energy, photoinitiator type and its concentration. The optimal UV coating was achieved when the PUA formulation containing 10 w% benzophenone was cured with a UV energy of $3;J/cm^2$ using a H-bulb. The moisture permeability of the UV-coated fabrics increased with increasing photoinitiator concentration with a marginal decrease in hydrostatic pressure. The addition of silicone diacrylate to the formulation was found to be beneficial in increasing the hydrostatic pressure. The UV-based PUA coating can be an alternative to the conventional thermal curing of solvent-borne polyurethane coatings due to the enhanced environment friendliness and energy saving.