During Construction. Sandstone Associates recommends on using 1/2" wedge anchors vs rebar and appoxy. A number of failures can occur by using rebar, holes get over augured or not cleaned out properly or appoxy dries over time etc this can create a failure in the wall attachement if there is any shifting in the foundation. Wedge anchors are not coming out of the old wall and with two inch washers with poured concrete will hold this new exterior wall in place. Don't cheap out and do not be lazy when it comes to the exterior wall connection.