Ledger

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Ledger

What is Ledger?

A horizontal structural member that supports joists, beams, or other structural elements, typically attached to walls or other vertical supports to transfer loads in construction applications.

Description

A ledger is a horizontal structural member that supports joists, beams, or other structural elements, typically attached to walls or other vertical supports to transfer loads in construction applications. This essential structural component serves as a bearing surface and connection point for floor joists, deck joists, or other horizontal framing members. Ledgers are critical for distributing loads from supported members to the main structural system and ensuring proper load transfer throughout the building.

The primary purposes include providing support for joists and horizontal framing members, transferring loads from supported elements to walls or other structures, creating a level bearing surface for consistent joist installation, enabling proper connection between different structural systems, facilitating load distribution across multiple support points, ensuring structural continuity and load path integrity, and providing attachment points for various building components.

Types and applications involve ledger boards, ledger strips, metal ledgers, and specialty ledger systems for different structural requirements.

FAQs

  • What is a ledger in construction?

    A ledger is a horizontal structural member that supports joists, beams, or other structural elements, typically attached to walls or vertical supports.

  • Where are ledgers commonly used?

    Ledgers are commonly used in deck construction, floor framing, mezzanine systems, and anywhere horizontal support is needed for joists or beams.

  • How are ledgers attached to structures?

    Ledgers are attached using appropriate fasteners like bolts, lag screws, or structural connectors, depending on the application and load requirements.

  • What materials are used for ledgers?

    Common materials include dimensional lumber, engineered lumber (LVL, PSL), and steel members, selected based on load requirements and application.

  • Do ledgers require special flashing?

    Yes, ledgers attached to exterior walls typically require proper flashing and waterproofing to prevent moisture infiltration and structural damage.

  • How do you size a ledger?

    Ledger sizing is based on load calculations including the loads from supported joists, span requirements, and bearing capacity of the supporting structure.

  • What are common problems with ledgers?

    Common problems include inadequate attachment, moisture infiltration, undersized members, and improper installation leading to structural issues.

Fun Fact

Fun Fact: The term “ledger” comes from the Middle English word “legger,” meaning something that lies flat! In medieval construction, ledgers were often large stones that provided horizontal support in masonry walls. Modern deck collapses are often traced to improperly installed or deteriorated ledger connections. Interestingly, a properly installed deck ledger can support thousands of pounds, but failure of this single connection point can cause catastrophic collapse!

CSI Code

06 10 00

NAHB Code

610