(1) Except as permitted in Sentence (2), foundation walls of hollow masonry units supporting floor joists shall be capped with,
(a) not less than 50 mm of concrete,
(b) solid masonry units that are 100% solid and not less than 50 mm high, or
(c) semi-solid or hollow solid masonry units that have the top course completely filled with mortar, grout or concrete.
(2) Capping required in Sentence (1) is permitted to be omitted,
(a) in localities where termites are not known to occur,
(b) when the joists are supported on a wood plate not less than 38 mm by 89 mm, and
(c) when the siding overlaps the foundation wall not less than 12 mm.