Numerous structures in seismic-prone regions lack the reinforcement needed to transfer shear forces across cold joints induced by lateral forces during an earthquake. The retrofit of cold joints is often challenging given the lack of access to the shear-deficient joint if conventional steel and concrete are used. Furthermore, current design guidelines such as ACI PRC-440.2-23 and IAPMO UES EC-038 lacks in proper guidance for enhancing shear transfer across such interfaces. As a result, This study investigates the shear transfer mechanism across a 90-degree cold joint using ±45° biaxial FRP (Fiber reinforced polymer) systems, with and without FRP anchors. ±45-degree biaxial glass and carbon FRP were investigated along with details that incorporate FRP anchors to restrict premature debonding and to contribute to the shear transfer. Fourteen slab-to-wall connection specimens were subjected to quasi-static cyclic loading to evaluate shear transfer across slab-to-wall connection. Two specimens represented plain concrete construction, while twelve were retrofitted using various FRP configurations with and without anchors. The test results demonstrated that FRP retrofitting enhances shear transfer across slab-to-wall connections, while the inclusion of doweled CFRP anchors further improves load-carrying capacity by actively engaging in the shear transfer mechanism.