MPAI Masonry Purlin Anchor for I-Joist
Purlin Anchors
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Product Details
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
Material
- 14 gauge
Finish
- Galvanized
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.
- 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
Related Literature
Product Information Table
| Model No. | Ga. | L (in.) | Coating/Material | Packaging Qty. |
|---|---|---|---|---|
| MPAI32 | 14 | 33 1/2 | Zinc Galvanized, G90 | 1 |
| MPAI44 | 14 | 45 1/2 | Zinc Galvanized, G90 | 1 |
Load Tables
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 | MPAI32 | 33 1/2 | 5 1/2 | (16) 0.148 x 1 1/2 | 2,885 | (16) 0.148 x 1 1/2 | 2,885 | (16) 0.148 x 1 1/2 | 2,355 | NA | 0.167 | |
| MPAI44 | 45 1/2 | 5 1/2 | (16) 0.148 x 1 1/2 | 2,885 | (16) 0.148 x 1 1/2 | 2,885 | (24) 0.148 x 1 1/2 | 2,865 | NA | 0.167 | ||
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 | MPAI32 | 33 1/2 | 5 1/2 | (16) 0.148 x 1 1/2 | 2,885 | (16) 0.148 x 1 1/2 | 2,885 | (16) 0.148 x 1 1/2 | 2,355 | 3,205 | 0.167 | |
| MPAI44 | 45 1/2 | 5 1/2 | (16) 0.148 x 1 1/2 | 2,885 | (16) 0.148 x 1 1/2 | 2,885 | (24) 0.148 x 1 1/2 | 2,865 | 3,205 | 0.167 | ||
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.
- 0.148" x 1 1/2" nails shall be used directly onto framing member. For installation over sheathing, use 2 1/8"-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.
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
