The canopy replacement tarp with valance overhang is made for 14' x 20' 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, Mildewproof, Rotproof and UV Resistant. Canopy replacement tarps with valance feature an 8 inch overhang around the frame edge and contain pull ties at the four corners, which tighten the cover for a secure fit. For 14' x 20' frames - Actual tarp size is 16' x 20'. The two extra feet is needed to cover the high center angle. See Measurement diagram below.