For ZIP System panels, fasteners should be spaced 6 inches on center along supported edges and 12 inches on center at intermediate supports, unless specific local codes or the design professional's plans dictate otherwise.
Understanding ZIP System Fastener Spacing
Proper fastener spacing is critical for ensuring the structural integrity and performance of ZIP System sheathing. The recommendations are designed to secure the panels effectively to the framing members, providing robust resistance against wind, seismic forces, and other structural loads. Adhering to these guidelines is a key part of the installation process.
Key Spacing Requirements
The primary spacing requirements differentiate between how fasteners are applied at the perimeter of a panel and within its field.
- Along Supported Edges: Fasteners, such as code-approved screws or nails, must be installed every 6 inches on center (o.c.) where the panel edges are supported by framing. This includes the top, bottom, and vertical sides of each panel that rest directly on studs, top plates, or rim joists. This tighter spacing along the edges helps to transfer shear forces efficiently and prevent panel uplift.
- At Intermediate Supports: For framing members that lie beneath the interior of a panel, away from its edges (e.g., studs in the middle of a wall cavity), fasteners should be spaced 12 inches on center (o.c.). This wider spacing is sufficient for securing the central areas of the panel, where stress concentrations are typically lower than at the edges.
A summary of the typical fastener spacing is provided below:
| Location | Spacing (on center) | Purpose |
|---|---|---|
| Along Supported Edges | 6 inches | Maximizes shear transfer and uplift resistance at panel perimeters. |
| At Intermediate Supports | 12 inches | Secures the panel field to internal framing members. |
The Importance of "On Center" (o.c.)
"On center" (o.c.) refers to the measurement from the center of one fastener to the center of the next. This ensures consistent and even distribution of fastening, which is vital for the structural performance of the sheathing system. For example, 6" o.c. means a fastener is placed, then the next fastener is placed 6 inches away from its center, and so on, along the framing member.
Local Codes and Design Specifications
It is crucial to remember that these are general guidelines. Local building codes or the specific design documents from a licensed architect or engineer of record may specify different fastening schedules based on project-specific requirements, environmental conditions (like high wind zones), or unique structural designs. Always consult the official ZIP System installation manuals and project-specific blueprints to ensure full compliance. For instance, in areas prone to hurricanes or earthquakes, fastener spacing might need to be denser than the standard recommendations.
- Consult Project Plans: Always refer to the construction documents and engineered drawings.
- Verify Local Building Codes: Check with local building authorities for any specific requirements or amendments to general guidelines.
- Use Code-Approved Fasteners: Ensure that the screws or nails used are approved for the application and meet the necessary load-bearing specifications for shear and withdrawal resistance.
By following these precise spacing requirements and consulting all relevant project and code documentation, you can ensure a secure and compliant installation of ZIP System sheathing.
