PA Purlin Anchor and Strap-Tie Holdown
Purlin Anchors
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Product Details
The PA is a solution for wood-to-concrete and wood-to-masonry connections which satisfies code requirements. The PA is designed to connect roof purlins to a concrete wall as a purlin anchor or to connect studs to the foundation as a strap-tie holdown. The PA features a dual-embedment line for ease of installation.
Key Features
- Minimum embedment line indicators for both concrete and masonry installations
- Nailing pattern optimized for narrow face of nominal 3x or double 2x wood member
- Low design profile minimizes visibility
Material
- 12 gauge
Finish
- Galvanized or ZMAX® coating
Installation
- 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.
- For vertical installation in the top of GFCMU, refer to engineering letter PA Models - Vertical Installation in the Top of GFCMU (L-C-PAGFCMUUP).
- PA51/PA68 — for additional length, an MST strap can be attached using 1/2" bolts through existing holes.
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
Related Literature
Product Information Table
| Model No. | Ga. | W (in.) | L (in.) | Coating/Material | Packaging Qty. |
|---|---|---|---|---|---|
| PA18 | 12 | 2 1/16 | 18 1/2 | Zinc Galvanized, G90 | 1 |
| PA18Z | 12 | 2 1/16 | 18 1/2 | ZMAX® | 1 |
| PA23 | 12 | 2 1/16 | 23 3/4 | Zinc Galvanized, G90 | 1 |
| PA23HDG | 12 | 2 1/16 | 23 3/4 | Hot-Dip Galvanized | 1 |
| PA23Z | 12 | 2 1/16 | 23 3/4 | ZMAX® | 1 |
| PA28 | 12 | 2 1/16 | 29 | Zinc Galvanized, G90 | 1 |
| PA28Z | 12 | 2 1/16 | 29 | ZMAX® | 1 |
| PA35 | 12 | 2 1/16 | 35 | Zinc Galvanized, G90 | 1 |
| PA35Z | 12 | 2 1/16 | 35 | ZMAX® | 1 |
| PA51 | 12 | 2 1/16 | 51 | Zinc Galvanized, G90 | 1 |
| PA51Z | 12 | 2 1/16 | 51 | ZMAX® | 1 |
| PA68 | 12 | 2 1/16 | 70 | Zinc Galvanized, G90 | 1 |
| PA68Z | 12 | 2 1/16 | 70 | ZMAX® | 1 |
Load Tables
These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.
Wind and SDC A&B — Allowable Tension Loads (160)
| Max. Ledger Size | Model No. | Strap Length, L (in.) | Embed Length, le (in.) | Uncracked Concrete | Cracked Concrete | GFCMU Wall | Max. Allowable Strap Tension | Deflection at Allowable Load (in.) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Concrete | GFCMU | Required Nails (in.) | Tension | Required Nails (in.) | Tension | Required Nails (in.) | Tension | |||||
| 4x Ledger | PA18 | 18 1/2 | 4 | 6 | (12) 0.148 x 3 | 2,430 | (12) 0.148 x 3 | 2,260 | (12) 0.148 x 3 | 1,890 | NA | 0.087 |
| PA23 | 23 3/4 | 4 | 6 | (16) 0.148 x 3 | 3,220 | (12) 0.148 x 3 | 2,260 | (16) 0.148 x 3 | 2,815 | NA | 0.118 | |
| PA28 | 29 | 4 | 6 | (16) 0.148 x 3 | 3,230 | (12) 0.148 x 3 | 2,260 | (16) 0.148 x 3 | 2,815 | NA | 0.085 | |
| PA35 | 35 | 4 | 6 | (16) 0.148 x 3 | 3,230 | (12) 0.148 x 3 | 2,260 | (16) 0.148 x 3 | 2,815 | NA | 0.085 | |
See Footnotes1 below
SDC C-F — Allowable Tension Loads (160)
| Max. Ledger Size | Model No. | Strap Length, L (in.) | Embed Length, le (in.) | Uncracked Concrete | Cracked Concrete | GFCMU Wall | Max. Allowable Strap Tension | Deflection at Allowable Load (in.) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Concrete | GFCMU | Required Nails (in.) | Tension | Required Nails (in.) | Tension | Required Nails (in.) | Tension | |||||
| 4x Ledger | PA18 | 18 1/2 | 4 | 6 | (12) 0.148 x 3 | 2,430 | (12) 0.148 x 3 | 1,980 | (12) 0.148 x 3 | 1,890 | 3,220 | 0.087 |
| PA23 | 23 3/4 | 4 | 6 | (14) 0.148 x 3 | 2,830 | (12) 0.148 x 3 | 1,980 | (16) 0.148 x 3 | 2,815 | 3,220 | 0.118 | |
| PA28 | 29 | 4 | 6 | (14) 0.148 x 3 | 2,830 | (12) 0.148 x 3 | 1,980 | (16) 0.148 x 3 | 2,815 | 3,935 | 0.085 | |
| PA35 | 35 | 4 | 6 | (14) 0.148 x 3 | 2,830 | (12) 0.148 x 3 | 1,980 | (16) 0.148 x 3 | 2,815 | 3,935 | 0.085 | |
Footnotes1
- Allowable loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern.
- Deflection listed is at the highest allowable load.
- Multiply seismic and wind ASD load values by 1.43 or 1.67, respectively, to obtain LRFD capacities.
- Nail quantities are based on Douglas fir (DF) or equivalent specific gravity of 0.50 or better. For use in spruce-pine-fir (SPF) or hem fir (HF), nails quantities shall be increased by 1.15 to achieve loads listed.
- For wall anchorage systems in SDC C-F, the maximum strap allowable load shall not be less than 1.4 times the ASD anchor design load.
- Minimum center-to-center spacing is 3x the required embedment — i.e., standard installation is based on a minimum 5" end distance.
- Structural composite lumber beams have sides that show either the wide face or the lumber strands/veneers. Values in the tables reflect installation into the wide face.
- Concrete shall have a minimum compressive strength of f'c = 3,000 psi.
- Grout-filled CMU (GFCMU) shall have a minimum compressive strength of f'm = 1,500 psi.
- PA models installed vertically in the top of a grouted masonry wall with 6" embedment and (12) 0.148" x 3" nails achieve an allowable uplift load of 1,890 lb.
- For PA models, 0.148" x 1 1/2" nails may be substituted for 0.148" x 3" nails at 100% of listed load and with a 15% increase in deflection. For installation over sheathing, use 3"-long nails minimum.
- Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.
These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.
Many of these products are approved for installation with Strong-Drive® SD Connector screws.
- Allowable loads have been increased for wind or earthquake loading with no further increase allowed. Reduce where other loads govern.
- Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
- Masonry applications require grout-filled CMU with minimum compressive strength of f'm = 1,500 psi.
- Deflection at highest allowable load is as follows: PA51 and PA68 = 0.10".
- PA allowable lateral loads are F1 = 795 lb. and F2 = 280 lb.
- #9 x 1 1/2" Strong-Drive® Connector screws (SD9) may be substituted for table fasteners with no load reduction.
- Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
