The present invention is an apparatus and method for repairing an isolation gap in a fiber cable after removing an isolation closure from the cable. A flexible, curable polymeric material is first applied in the gap over the fiber buffer tube. A flexible wire mesh strengthening member is then placed over the gap and over the exposed metallic elements of the fiber cable on both sides of the gap. The strengthening member is closed around the fiber cable and is woven with the metallic elements of the cable. A heat shrink material is then applied over the strengthening member and is sealed by heating. The heat shrink material may be sealed with a polymer sealant.