MMHC® Hinged Roof Connector
Product Details
The innovative MMHC hinged roof connector makes it easy to build a stick-frame roof in the factory that can fold flat during shipping. This connector has been tested and load rated in multiple directions. It can be installed on one or both sides of the roof rafter assembly.
The MMHC23 model is a hinge for a 2x3 minimum attic truss knee wall. It has been specifically designed to complement our ATHC™ attic truss hinge connector.
Key Features
- Innovative hinge rotates easily from open position to folded
- The offset nail pattern allows for installation on both sides
- Connector tabs make it intuitive to position before nailing
- Nails in place for easy installation; no bolts required
- No measuring or predrilling saves installers time
Material
- 18 gauge
Finish
- Galvanized
Installation
- Arrange members in installed position
- Open connector to same position
- Place on wood members using tabs as a guide
- Install with specified nails
- Adjust members for shipping purposes, then reopen at jobsite
- MMHC does not replace the need for solid blocking
- MMHC - Minimum 2x6 roof rafter and ceiling joist; minimum 2x4 kneewall stud
- MMHC23 - Minimum 2x3 kneewall stud
Patent Information
- US Patent 11,131,088
Related Literature
Product Information Table
| Model No. | Member Size | Ga. | Coating/Material | Packaging Qty. |
|---|---|---|---|---|
| MMHC | Minimum 2x6 roof rafter and ceiling joist; minimum 2x4 knee wall stud | 18 | Zinc Galvanized, G90 | 1 |
| MMHC23-R60 | Minimum 2x3 knee wall stud | 18 | Zinc Galvanized, G90 | 60 |
Load Tables
Allowable Loads for Knee Wall Application
| Model No. | Roof Pitch | Connector Quantity | Knee Wall Member | Fasteners per Member | Allowable Load (lb.) | |||
|---|---|---|---|---|---|---|---|---|
| DF/SP | SPF/HF | |||||||
| Download (115/125/160) | Uplift (160) | Download (115/125/160) | Uplift (160) | |||||
| MMHC | 3:12-12:12 | 1 | 2x4 min | (5) 0.148 x 1.5" | 1,145 | 385 | 1,010 | 330 |
| MMHC23 (min) | 3:12-12:12 | 1 | 2x3 min | (3) 0.148 x 1.5" | 715 | 185 | 625 | 160 |
| 2 | 2x3 min | (6) 0.148 x 1.5" | 1,260 | 410 | 1,105 | 370 | ||
| MMHC23 (max) | 3:12-12:12 | 1 | 2x3 min | (5) 0.148 x 1.5" | 1,235 | 335 | 1,090 | 295 |
| 2 | 2x3 min | (10) 0.148 x 1.5" | 1,395 | 600 | 1,225 | 530 | ||
- All installations assume single-ply 2x members with minimum 2x4 for the MMHC and 2x3 minimum for the MMHC23.
- Applications with double-ply 2x members are allowed and will achieve twice the published load of the single one-sided installation.
- When Simpson Strong-Tie SD10x1 1/2" screws are substituted for 0.148x1 1/2 nails, MMHC23 (max) uplift capacities can be increased to 970 lbf and 835 lbf for DF/SP and SPF/HF capacities, respectively.
- Fasteners: Nail dimensions are listed diameter by length.
MMHC Installed at Knee Wall
Allowable Loads for Single-Ply Rafter to Ceiling Joist
- All installations assume at minimum a single-ply 2x member.
- Double-ply applications with two-sided installation will achieve twice the published load for the one-sided installation.
- Linear interpolation of the loads is allowed for roof pitches between 3:12 and 12:12.
MMHC Installed at Heel
Code Reports & Compliance
Drawings
| DWG | DXF | RFA | IFC | SAT | |||
|---|---|---|---|---|---|---|---|
