20' x 50' Frame Valance Canopy Replacement Cover (Fits 18 x 50 Frames)*** Does Not Include Frame, Cover Only. The canopy replacement tarp with valance overhang is made for 18' x 50' frames and is fabricated using 6 Oz, 12 mil. polyethylene materials and contains grommets every 18" on the underside of the cover. Every tarp is Waterproof, Mildew-proof, Rot-proof and UV Resistant. Canopy replacement tarps with valance feature an 6 inch overhang around the frame edge and contain pull ties at the four corners, which tighten the cover for a secure fit. For 18' x 50' frames - Actual tarp size is 20'x 50' (19'6" x 49'6") Finished from grommet to grommet. The two extra feet is needed to cover the high center angle. See Measurement diagram below.Measurements Are Approximates And May Vary Slightly Due To Fitting Connectors.