Pavers may be glued over existing concrete using a special adhesive known as Paver Bond. Avoid gluing pavers in ground level applications such as driveways, walks or patios as the existing concrete may not be of sufficient quality. Also, gluing in these situations nullifies the ability of the paver surface to adjust with movement during the freeze-thaw cycle. Pavers are most successfully glued in applications using retaining wall units such as stairways and elevated patios. Genuine Paver Bond should be used as ordinary construction adhesive will not provide a bond that is both strong and flexible.