The invention relates to a joint tape, in strip form, formed by an open-mesh glass fiber warp knit fabric or woven fabric, said warp knit fabric or woven fabric comprising fibers parallel to the length of the strip and fibers perpendicular to the length of the strip, said tape being characterized in that at least one glass fiber, referred to as reinforcing fiber, parallel to the length of the strip and located in the central zone thereof, has a linear density at least five times higher than the linear density of the other fibers.