Details of Reinforcement

Site of Reinforcement

Longitudinal and cross wires of joint reinforcement shall have a minimum wire size of W1.1 (11ga) and a maximum wire size of one-half the joint thickness (Example: 3/16" wire in a typical 3/8" bed joint).

Manufacturer's Comment: The use of W1.1 (11ga) joint reinforcing is rare because its small diameter makes it difficult to get a quality weld. Nine gauge longitudinal rods and cross rods are the standard for single and multiwythe masonry walls. A 2.8 (3/16 gauge) is recommended when steel requirements are not met using W1.7(9ga). When using an adjustable system in cavity and composite walls, the use of 3/16" longitudinal rods in the back-up (block) is not recommended. The height of the joint reinforcing is .333 on average when the 3/16 adjustable eyes or tabs are burnt half way down into the 3/16 longitudinal rod leaving only .042 inches clear between the wire and block...less than 1/16". A steel crowded bed joint has less protection from a lack of mortar and increases the chances of potential corrosion and leakage.

Protection for Reinforcement

Longitudinal wires of joint reinforcement shall be fully embedded in mortar or gout with a minimum cover of 5/8 in. (16 mm) when exposed to earth or weather and 1/2 in. (13 mm) when not exposed to earth or weather. Joint reinforcement in masonry exposed to earth or weather shall be corrosion resistant or protected from corrosion by coating.