BL-21 Ladder Reinforcement

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The BL-21 consists of ladder-type masonry reinforcing with box ties lap-welded every 16” (400 mm) O.C.

  • They extend across the cavity or collar joint into the outer wythe and should be embedded a minimum of 1-1/2“ (40 mm) but no closer than 5/8” (16 mm) from the outer face.
  • A fabricated ladder-type reinforcement designed to be embedded in the horizontal mortar joints of cavity, veneer and composite masonry walls.
Finish Material Specification Coating Specification Minimum Coating Mass
Mill Galvanized Wire CSA A370-14 A641 .010”
Hot Dipped Galvanized After Fabrication Wire CSA A370-14 ASTM A153 Class B2 1.50 oz/ft2 (457 g/m˛)
Stainless Steel Wire ASTM 79-AISI, Type 302 & 304 None Uncoated
  • 10’ (3.048 m) lengths.
  • 25 pieces per bundle.
  • Bed joint alignment for connecting wythes recommended.
  • Complies with ASTM C951, ACI 530 for joint reinforcement, CSA standard A370.

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