Simpson Tie Selection Calculator

About the Simpson Tie Selection Calculator

Simpson Strong-Tie connectors are among the most widely used structural hardware in residential construction. From hurricane clips that resist uplift to joist hangers that support floor framing, the right connector ensures code compliance and structural safety. With hundreds of products in the catalog, selecting the correct one can be confusing.

This Simpson tie selection calculator helps you narrow down the connector type based on your connection requirement: rafter/truss-to-plate (hurricane clips), joist-to-beam (hangers), post-to-beam (caps), post-to-concrete (bases), and strap ties. For each category, it provides common model numbers, rated capacities, and nail requirements.

This is a reference tool—always verify that the selected connector's published capacity meets or exceeds your design load. Simpson's catalog and website provide detailed tables for every connector.

When This Page Helps

Choosing the wrong connector or installing it improperly is a common inspection failure. This calculator helps you identify the right Simpson product for your connection type and lumber size.

How to Use the Inputs

1. Select the connection category (rafter/truss tie, joist hanger, post base, etc.).
2. Select the lumber size being connected.
3. Enter the required uplift or download load if known.
4. Read the recommended connector model and its rated capacity.
5. Verify with the Simpson catalog that all conditions match your application.

Example Calculation

Tips & Best Practices

• Always use the nail type and quantity specified by Simpson—substituting smaller or fewer nails voids the rated capacity.
• Simpson connectors require 8d×1.5″ short nails (SD8) or 10d×1.5″ nails (N10A) for most connections—these are shorter than standard nails.
• Many connectors come in left-hand and right-hand versions for skewed installations.
• Simpson ZMAX coating is required for preservative-treated lumber (ACQ, CA-B). Standard G90 galvanizing is corrosion-resistant but not rated for all treated-lumber chemicals.
• Download the free Simpson Strong-Tie Connector Selector app or use their website's tool for detailed filtering.
• Install connectors before sheathing where possible—it's much easier to nail when you have clear access.

Common Simpson Connector Categories

Hurricane/seismic ties: H1, H2.5, H10, LSTA—connect rafters/trusses to top plate to resist uplift. Joist hangers: LU, HU,?"U—support joists at beams. Post bases: ABU, ABA, PBS—anchor posts to concrete. Post caps: BC, LPC, AC—connect beams to post tops. Strap ties: LSTA, MSTA, CMST—provide tension connections across joints.

Installation Quality

The most common installation error is using wrong or too few nails. Many hangers require Simpson's proprietary 1.5″ nails (10d×1.5 or 8d×1.5) that are shorter than standard framing nails to avoid penetrating the back of the beam. Using standard 16d nails can split the member or protrude dangerously.

Code Requirements

The IRC requires approved connectors for rafter/truss-to-plate connections in high-wind zones (wind speed > 115 mph) and in Seismic Design Categories D and E. Many jurisdictions require connectors on every rafter/truss regardless of wind speed. Check your local amendments.

Frequently Asked Questions

• What hurricane clip do I need?

  For standard 2× rafters/trusses: H2.5 or H2.5A for lighter loads (590 lbs uplift), H10 or H10A for medium loads (1,300 lbs), and LSTA straps for heavy loads (1,500+ lbs). The choice depends on the calculated uplift force from wind analysis.

• Which joist hanger for a 2×10?

  The LU210 is the standard face-mount hanger for a single 2×10. For top-flange conditions, use the HU210. For double 2×10 members, use the LU210-2. Capacities range from 1,000 to 3,000+ lbs download depending on the model.

• What connector for post-to-concrete?

  The ABU (adjustable post base) series handles one-piece concrete or retrofit. The PBS (post base standoff) series elevates the post above the concrete to prevent moisture contact. Use ABA for moment-resistant connections requiring uplift capacity.

• Do steel connectors weaken over time?

  Properly specified connectors (G90 galvanized for interior/dry, ZMAX or stainless for treated lumber/coastal) have excellent long-term durability. Corrosion is the main concern—use the correct coating for the exposure conditions.

• Can I bend or modify a Simpson connector?

  No. Bending, cutting, or modifying a connector voids its rated capacity. If a standard product doesn't fit, find the correct model or contact Simpson engineering for custom solutions.

• How do I fasten a connector to the concrete?

  Simpson post bases attach to concrete with anchor bolts (cast-in-place J-bolts) or expansion anchors (Titen HD, Strong-Bolt). The anchor type and size must match the connector's requirements. Always follow the installation instructions.