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MPAI Masonry Purlin Anchor for I-Joist

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The MPAI is a solution for wood-to-concrete and wood-to-masonry connections which satisfies code requirements. This purlin anchor is specifically designed for open-web truss joint connections to concrete or masonry walls. The MPAI features minimum embedment line indicator for ease of installation.

Key Features

  • Minimum embedment line indicators for both concrete and masonry installations
  • Nailing pattern optimized for an I-joist wood member
  • Low design profile minimizes visibility


  • 14 gauge


  • Galvanized


  • Use all specified fasteners; some models have extra fastener holes. See General Notes.
  • Purlin anchor must hook around rebar.
  • Allowable loads are for a horizontal installation into the side of a concrete or masonry wall.
  • Strap may be bent one full cycle (bent vertical 90°, then bent horizontal).

Edge Distance — minimum concrete edge distance is 5″. Minimum concrete-block left-to-right edge distance is 20″.

Concrete Block Wall — the minimum wall specifications are:

A — one # 4 vertical rebar, 32″ long, 16″ each side of anchor
B — two courses of grout-filled block above and below the anchor (no cold joints allowed)
C — a horizontal bond beam with two #4 rebars, 40″ long, a maximum of two courses above or below the anchor
D — minimum masonry compressive strength, f’m = 1,500 psi

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