(1) Floor joists supported on cavity walls shall be supported on solid masonry units not less than 57 mm high.
(2) Floor joists described in Sentence (1) shall not project into the cavity.
(3) Roof and ceiling framing members bearing on cavity walls shall be supported on,
(a) solid masonry units not less than 57 mm high, bridging the full thickness of the wall, or
(b) a wood plate not less than 38 mm thick, bearing not less than 50 mm on each wythe.