Drywall-Through Joist Hanger for Fire-Rated Wood Connections

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Solution Overview

Problem

Existing joist hangers in building construction often damage drywall when securing joists to headers, compromising the drywall's fire-resistant properties and structural integrity.

Innovation Solution

A joist hanger design that allows drywall panels to be interposed between the joist and the structural member, with side walls extending through the panels to support the joist without embedding into the header, using light gauge sheet steel and back flanges to maintain the drywall's fire-resistant properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If drywall panels are installed between the joist and structural member to provide fire resistance, then fire protection is improved, but the drywall is susceptible to cracking and crushing under load

Engineering Contradiction:

Improvefire protectionVSAvoiddrywall bearing strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

A steel reinforcement system comprising vertical channels and horizontal plates is introduced as an intermediary between the drywall and the structural members. The channels are embedded in the drywall and extend through it, providing a strong structural framework that allows the drywall to maintain fire protection while the steel components bear the mechanical loads, preventing cracking and crushing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If traditional joist hangers are used to secure joists to headers, then structural connection is improved, but the drywall is damaged and fire-resistant properties are compromised

Engineering Contradiction:

Improveconnection strengthVSAvoidfire resistance

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The steel channels and plates serve as intermediaries that transfer loads between the joist and header without requiring direct attachment to the drywall. The reinforcement system is embedded in the drywall and provides the structural connection, allowing the drywall to remain intact and maintain its fire-resistant properties while achieving strong structural connectivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system combines drywall and steel reinforcement into a composite construction assembly. The drywall provides fire resistance and the embedded steel channels and plates provide structural strength and load-bearing capacity, creating a composite system that achieves both fire protection and structural integrity without compromising either function.

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If drywall is used to shield structural members from fire, then fire protection is improved, but the drywall has little bearing strength with regard to fasteners

Engineering Contradiction:

Improvefire protectionVSAvoidfastener bearing capacity

Core Design Contradiction:

Object-affected harmful factorsVSForce

Solution Approach 1:

The steel channels embedded in the drywall act as intermediaries that distribute fastener loads. Instead of fasteners directly engaging the drywall, they attach to the steel reinforcement system, which has high bearing capacity. This allows the drywall to maintain its fire protection function while the steel components handle the mechanical fastening forces.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12546106B2Drywall hanger

Publication Date: 2026.02.10 SIMPSON STRONG TIE

AI summary

A connection utilizing a joist hanger to hang a joist or beam from a wood structural support member such as a top plate or header in cooperation with a first plurality of fasteners such as screws and one or more substantially vertical fire-resistant panels such as drywall.