Why use Shear-X?
- Shear-X brackets are designed to transfer in-plane shear forces at the ridge line of roof diaphragms
- The brackets enhance the diaphragm action in unblocked diaphragms
What is an Unblocked Diaphragm?
- An Unblocked Diaphragm is one in which the wood structural panels (i.e., plywood or Oriented Strand Board (OSB) roof sheathing) are only required to be attached to the framing members (i.e., rafters or trusses) and the edges of the panels between the framing members are NOT required to be supported by and attached to blocking (e.g., 2x_ lumber)
- Most wood framed roof systems in the U.S. are constructed with Unblocked Diaphragms
- If in doubt, check with the local building code official or a registered design professional to verify the type of roof diaphragm used for your specific project
- If the roof diaphragm is Unblocked, follow the steps in this installation guide
Roof Ridge Installation
- The brackets can be bent to accommodate any roof pitch from flat to 12:12
- The design values for the Shear-X brackets have been developed by an ISO/IEC 17065 Accredited Product Certification Body based on testing by an ISO/IEC 17025 Approved Agency
- The roof diaphragm must be sheathed with plywood or OSB wood structural panels installed per the requirements of the building code and the construction documents for the project
- Rafters and trusses must be minimum 2x4 SPF No. 2
- Select Shear-X 16” or 24” to match truss or rafter on-center spacing
- Install brackets with 10d (0.131” diameter by 3” long) smooth shank nails.
- Use of positive placement nail guns greatly increases installation efficiency
- Consult Shear-X Bracket – Roof Ridge Design Guide for Unblocked Roof Diaphragms to determine bracket spacing for your project
- Lay out brackets along ridge lines at required spacing
- Each ridge segment requires a minimum of two brackets, one at each end
When installed in new construction:
- Install wood structural sheathing per the requirements of the building code and the building designer
- Prior to installing the Shear-X brackets, the installer must remove 1" to 1½" of sheathing on both sides of the ridge leaving 6" to 12" at each end of the ridge uncut
- Center the Shear-X bracket on the ridge line
- Ensure each end of the bracket aligns with the roof framing below.
- Attach the bracket with 10d (0.131"x 3") nails in each pre-punched hole along the ridge line
- Bend bracket tightly to the top of the roof sheathing to conform to the pitch of the roof
- Secure each end of the bracket through the roof sheathing to the rafters/trusses with a minimum of four (0.131”x3”) nails
- Install nails in the pre-punched holes closest to the ridge
- Make sure bracket remains flat against the roof sheathing
- Complete the attachment of the bracket by installing the remaining nails
- Be sure to nail directly into the rafters/trusses and NOT just the sheathing
- Roll out and install ridge vent along ridge line of roof according to manufacturer’s installation instructions
- Install the ridge cap shingles according to shingle manufacturer’s instructions