The gaps between the wall and joist cap and joist should be filled with mortar, which should be tooled-in well to the sides of the joist and the joist cap.

Note 1: there are no exposed flanges or tabs to the front or rear of the wall to impede the tooling-in of the mortar.

Note 2: the upper flanges of the joist caps protrude only slightly above the wall and therefore do not cause a significant tripping hazard.

Note 3: the side flanges of the joist cap become fully embedded in mortar to form the seal to either side of the joist.