Abstract: An insulating glazing includes two glass sheets spaced apart by an air- or gas-filled cavity, a spacer arranged at a periphery of the glass sheets and that keeps the glass sheets spaced apart, a transparent spacer made of transparent plastic and placed on at least one of the sides of the glazing, and a first leaktight barrier that is leaktight to water, formed by a structural seal, a material of which is watertight, and a second leaktight barrier that is leaktight to gases and to water vapor, the leaktight barriers being made of transparent material, wherein the spacer includes on at least one of its internal and external faces, the internal and external faces being respectively facing and on the opposite side from the gas-filled cavity, a coating which is thin and constitutes the second transparent barrier, the coating and the transparent spacer forming a single assembly.