The tie in a cavity wall is used to tie the internal and external walls together. It is placed in the cavity wall during construction and spans the cavity. The ends of the tie are designed to lock into the cement. If using partial fill insulation systems, Insulation Clips are required to keep the insulation in place. You can order online and pick your delivery date or alternatively collect from one of our branches. Addresses for all our branches in Bradford can be found by Clicking Here.