PA/HPA Purlin Anchors


PA/HPA purlin anchors offer solutions for wood to concrete and concrete block connections which satisfy code requirements. The PAs dual embedment line allows installation in concrete or concrete block.

Material: PA – 12 gauge; HPA – 10 gauge.

Finish: Galvanized. PA’s available HDG or ZMAX® coating .


  • 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 Walls: 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 = 1500 psi.

  1. Allowable loads have been increased for earthquake or wind load durations with no further increases allowed.
  2. Deflection at highest allowable loads are as follows:
    PA18 = 0.087″, PA23 = 0.118″, PA28 = 0.085″, PA35 = 0.085″, PA51 & 68 = 0.010″, HPA28 = 0.133″ and HPA35 = 0.132″.
  3. Multiply Seismic and Wind ASD load values by 1.4 or 1.6 respectively to obtain LRFD capacities.
  4. Minimum center-to-center spacing is 3 times the required embedment. Standard installation is based on minimum 5″ end distance.
  5. For wall anchorage systems in SDC C-F, the maximum allowable strap tensile capacity shall not be less than 1.4 times the ASD anchor design load per ASCE7-10
  6. Nail quantities are based on Douglas Fir (DF) and Southern Pine (SP). For use on Spruce Pine-Fir (SPF) or Hem Fir (HF) nail quantities must be increased by 1.15 to achieve allowable loads – alternatively, loads may be decreased by a 1.15 factor.
  7. Concrete shall have a minimum concrete strength, f’c of 3000 psi.
  8. For Masonry Installation Loads, see ‘Non-Cracked Concrete’ for Required Nails.
  9. 10dx1 1/2″ nails may be substituted for 10d commons with no load reduction and with a 15% increase in deflection. For installation over sheathing use 3″ minimum nail lengths.
  10. Minimum f’m = 1500 psi for masonry.
  11. NAILS: 10d = 0.148″ dia. x 3″ long.. See other nail sizes and information.
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