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ATHC™ Attic Truss Heel Hinge Connector

The first-of-its-kind ATHC double-hinge connector for truss heels gives builders a new cost-effective option to construct factory-built truss components using EWP floor joists and 2x solid sawn roof rafters. The connector works with 2 1/2"-wide OPENJOIST™ and I-joist floor joists that are commonly used for attic trusses. To enable folded components to ship flat for transportation, the ATHC heel height provides a 2 1/2" gap between the top and bottom truss chords that accommodates a 2x3 folded knee brace.

Key Features

  • One-piece design simplifies hinge placement and provides installation efficiencies over other two-piece hinge alternatives
  • Works with 2 1/2"-wide OPENJOIST and I-joist floor joists to reduce the need for intermediate truss webs
  • Accommodates a range of roof pitches between 5:12 and 12:12
  • A folded ATHC provides a space to accommodate a folded 2x3 knee brace so that components ship flat for transportation
  • Eliminates the need for conventional metal-plate-connected trusses

Material

  • 16 gauge

Finish

  • G90

Installation

  1. Use the minimum of a 2x6 roof rafter, 2 1/2"-wide OPENJOIST or I-joist floor joists, and 2x3 knee brace.
  2. Utilizing a jig, arrange cut-to-length members and position ATHC in the open or folded position as desired.
  3. Install with specified fasteners.
  4. Fold components for transportation, then unfold at the jobsite.

Related Literature

Unfold the Secret to Smarter Hinged Roof Components
F-OS-HINGE24
A flier providing product descriptions, features, benefits and load tables for the ATHC™ and MMHC®23 hinge connectors.
Flier

Product Information Table

Fastener Production Information and Stuff & Things
New products
Model No. Joist Size Ga. Coating/Material Packaging Qty.
ATHC-R30 2x rafter; 3x floor joists 16 Zinc Galvanized, G90 30

Load Tables

Allowable Loads for Roof Rafter to Ceiling Member

Model No. Roof Pitch Connector
Quantity		 Member Fasteners per Member Allowable Load (lbf)
DF/SP SPF/HF
Rafter Ceiling
Member		 0.148 x 1 1/2" F1 F2 F3 Uplift F1 F2 F3 Uplift
(160) (115/125/160) (160) (160) (115/125/160) (160)
ATHC 5:12 1 2x 3x 12 100 730 755 780 100 635 650 675
12:12 1 2x 3x 12 100 1,065 965 780 100 920 835 675
  1. All installations assume a single-ply 2x rafter member
  2. Optional SDWC™ Installation 1 (see detail), F2 5:12 allowable loads can be increased to 820 lbf and 735 lbf for DF/SP and SPF/HF, respectively.
    F2 12:12 allowable loads can be increased to 1,190 lbf and 1,060 lbf for DF/SP and SPF/HF, respectively.
  3. Optional SDWC Installation 2 (see detail), F2 5:12 allowable loads can be increased to 975 lbf and 840 lbf for DF/SP and SPF/HF, respectively.
    F2 12:12 allowable loads can be increased to 1,385 lbf and 1,185 lbf for DF/SP and SPF/HF, respectively.
  4. Linear interpolation of the loads is allowed for roof pitches between 5:12 & 12:12.
  5. Table loads are applicable to installation on 3x (2 1/2" wide) solid sawn ceiling members with a depth of 1 1/2" or greater.
  6. Fasteners: Nail dimensions are listed diameter by length. SDWC15600 = 0.152" shank diameter x 6" long Strong-Drive SDWC Truss Screw.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

Related Products

Strong-Drive® SDWC™ TRUSS Screw
Strong-Drive® SDWC™ TRUSS Screw
MMHC®
MMHC®
Hinged Roof Connector