Abstract: A window assembly that includes a window frame is described. The window frame includes, in an exemplary embodiment, a plurality of frame members joined together at joints to form the frame, and a plurality of sealant blocks, with one sealant block positioned at each of the joints. Each sealant block includes an inner surface, an outer surface, an upper surface and a lower surface. The sealant block also includes a set-back ledge in the inner surface extending the length of the sealant block adjacent one of the upper surface or the lower surface. The set-back ledge is defined by a recessed portion of the inner surface and a recessed portion of the upper surface or a recessed portion of the lower surface. The sealant block further includes a plurality of filler holes extending through the sealant block from the outer surface to the recessed portion of the inner surface.