Joist Hangers
Joist hangers are metal connectors that support wood joists, headers, and beams at the end of a member where bearing cannot occur directly over a wall or beam.
Fast Facts
- What Is It?
- A formed steel connector that transfers joist load into a supporting beam, ledger, or header.
- Common Uses
- Deck framing, floor framing, stair landings, roof framing transitions, and engineered lumber connections.
- Cost Range
- $1.00–$20.00 each depending on size, load rating, finish, and special features.
- Durability
- Very good when the connector coating matches the exposure and preservative treatment level.
Specifications
| Property | Value |
|---|---|
| Common Series | Simpson LUS, LU, HUS, THA; USP and MiTek equivalents |
| Material | G90, ZMAX / G185, stainless steel, or specialty finishes depending on exposure |
| Load Path | Transfers vertical joist reaction into supporting member through hanger seat and side flanges |
| Fasteners | Use only manufacturer-specified hanger nails or approved connector screws |
| Sizing | Match joist width, depth, and lumber type exactly |
| Inspection Point | Missing face nails or substituted deck screws void published capacity |
Why Hangers Matter
A joist hanger is not just a bracket. It is a tested connector that creates bearing where none exists naturally. Without it, the end of a joist has no reliable way to transfer load into the supporting member.
That makes hangers foundational in deck ledgers, stair framing, headers, dropped beams, and remodel conditions where end-bearing is limited.
Fastener Selection Is Part of the Connector
Published hanger capacity assumes the exact nail or connector screw listed in the catalog. Smaller nails, roofing nails, drywall screws, and generic deck screws all change the test result and should be treated as unapproved substitutions.
Many inspection failures come down to a handful of missing or incorrect fasteners, not the hanger body itself.
Moisture and Corrosion Considerations
Deck ledgers and pressure-treated framing demand compatible coatings. ZMAX or stainless steel hangers are common for ACQ-treated exterior lumber, while interior dry framing may use lighter coatings.
If you are combining fasteners, hangers, and treated lumber, always verify that all three are chemically compatible with one another.
Frequently Asked Questions
Can I use deck screws in joist hangers?
No. Deck screws are brittle and are not approved as substitutes for joist hanger nails unless the hardware manufacturer specifically lists a connector screw for that hole pattern.
Do engineered joists need special hangers?
Often yes. I-joists, LVL, and multi-ply members may need specific top-flange or face-mount hangers sized to the exact product depth and flange geometry.
What is the difference between face-mount and top-flange hangers?
Face-mount hangers attach to the supporting member face. Top-flange hangers bear from above and are common where the beam top must align with the joist top, such as floor framing over steel or dropped beams.
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Also Consider
Structural Screws
Structural screws are engineered fasteners designed to replace or outperform lag screws, carriage bolts, and common framing nails in many wood-to-wood structural connections.
Pressure-Treated Lumber
Pressure-treated lumber is dimensional softwood (typically Southern Yellow Pine) infused with preservative chemicals under pressure to resist rot, decay, and insect damage. The most common decking and structural lumber for outdoor applications.
LVL (Laminated Veneer Lumber)
Laminated veneer lumber (LVL) is a high-strength engineered wood product made from thin wood veneers bonded with structural adhesive under heat and pressure. It is the most commonly specified engineered beam and header material in residential and light commercial construction.
I-Joists (Engineered Wood Joists)
I-joists are engineered wood floor and roof framing members with an I-shaped cross section — LVL or solid lumber flanges bonded to an OSB or plywood web. They are the dominant floor framing material in new residential construction, offering long spans, dimensional stability, and lightweight handling.