(A) General. In each wythe of plain solid masonry, not less than 75% of the units in any vertical plane perpendicular to the wall plane shall lap the ends of the units above and below a distance not less than one and one-half inches or one-half the height of the units, whichever is greater or the masonry shall be reinforced longitudinally.
(B) Bonding.
(1) Adjacent wythes in bearing and non-bearing walls shall be bonded by either headers or metal ties.
(2) Where headers are used, the facing and backing shall be bonded so that not less than 4% of the exposed face area is composed of solid headers extending not less than four inches into the backing. The distance between adjacent full-length headers shall not exceed 24 inches vertically or horizontally. Where the backing consists of two or more wythes, the headers shall extend not less than four inches into the most distant wythe or the backing wythes shall be bonded together with separate headers whose area and spacing conform to the foregoing.
(3) Where metal ties are used, the facing and backing shall be bonded with approved corrosion-resistant unit metal ties or cross wires or masonry joint reinforcement. Unit ties shall be of sufficient length to engage all wythes, with ends embedded not less than one inch in mortar, or shall consist of two lengths, the inner embedded ends of which are hooked and lapped not less than two inches.
(Prior Code, § 9-116) (Ord. 94-11B, passed 4-21-1994)