The Metal Sales Image II roofing system is a mechanically attached metal roof panel designed for residential and architectural buildings. Installation requires adherence to building codes and manufacturer guidelines, with specific attention to substructure alignment and proper fastening techniques. The system is available in various gauges, finishes, and widths, and is intended for use over solid substrates, not open structural framing.
System Overview and Applications
The Image II roof panel system is intended for both new construction and retrofit applications. The panels are designed for use on buildings ranging from residential to architectural structures. The system utilizes a concealed direct fastening method, employing truss head woodscrews applied through factory-punched slots into wood decking. The documentation specifies that the Image II is designed to be utilized over a solid substrate, and is not recommended for use over open structural framing. Proper substructure alignment is crucial to avoid panel distortion.
Technical Specifications
Image II panels are available in 12-inch and 16-inch widths, with a 1-inch rib height. The minimum recommended roof slope for installation is 3:12. Minimum panel length is 5 feet, with a maximum recommended length of 30 feet; longer panels may require additional consideration regarding packaging, shipping, and erection. The standard panel gauge is 26, with 24 gauge available as an option. Available finishes include Acrylic Coated Galvalume®, MS Colorfast45®, and various Kynar 500 (PVDF) colors.
Installation Procedures: Initial Steps
Prior to panel installation, several preparatory steps must be completed. A moisture barrier, such as a minimum 30# felt, must be installed. All cleat and eave flashings must be installed before beginning panel installation. If a gutter is required, installation instructions for gutters are detailed separately. Valley flashings also require installation prior to panel application. When positioning valley flashing, work from the low end to the high end of the roof. Attachment to the substrate should be completed using #8-18 x 3/4" Truss Head Woodscrews, spaced 4 feet on center. These screws must be positioned to be covered by the Image II panel when installed.
Panel Installation: Exposed Fastened Method
The exposed fastened panel installation begins with applying a row of Double Bead Tape Sealant on the top leg of the eave flashing. The first panel is then installed, ensuring proper overhang and squareness to the eave and rake. Maintaining a straight and square alignment of the first panel is critical, as it controls the alignment of subsequent panels.
Detailed Component Installation
Specific details are provided for installing components such as 1" Z-closures. These closures require fastening into place, followed by a continuous row of Double Bead Tape Sealant applied on top. Ridge/Hip details involve the use of Pop Rivets and Double Bead Tape Sealant, with specific sequences outlined in the documentation. Slope change details also require the use of Double Bead Tape Sealant, Truss Head Woodscrews, and offset cleats.
Fastening Requirements and Considerations
The fastening system utilizes Truss Head Woodscrews. Fastener spacing is generally 18 inches on center, except in areas subject to extreme wind uplift conditions, where closer spacing may be necessary. The documentation emphasizes the importance of consulting a fastener selection guide to choose the appropriate fasteners for specific applications, ensuring that quantity and type meet necessary loading and code requirements. Caution is advised regarding fastener application; overdriving fasteners can cause stress and induce oil canning (surface distortion) on the panel face. The recommended tool type is a screw gun with a depth locating nose or adjustable clutch to prevent overdrilling and stripping. Impact tools or runners should not be used. Proper torque is essential to seat the washer, ensuring a watertight seal.
Quality Control and Maintenance
Following installation, a thorough inspection of panel surfaces and flashings is recommended to remove any loose debris or metal shavings. Panels should be wiped down with a soft cloth, avoiding abrasive materials that could cause scratches. Dirt residue can be removed with a mild detergent, water, and a soft cloth. Severe scratches, dents, and holes necessitate panel replacement.
Fire Resistance Ratings
The Image II roofing system has undergone fire resistance testing. The system, identified by an alphanumeric design number, has been evaluated according to UL 2218, UL790, UL263, and ASTM E-1592 standards. Detailed information on specific assemblies and hourly ratings can be found in the UL Fire Resistance Directory. The system includes a hat-shaped member (minimum 16 gauge) fastened to a steel roof deck with minimum No. 14 self-drilling/self-tapping fasteners. Compressible UL Classified glass fiber blanket insulation, with or without a vapor retarder facing, may be used between the roof insulation and the metal roof panels. A bearing plate (minimum 16 gauge) is also fastened to the steel deck with similar fasteners.
Important Considerations and Limitations
The documentation emphasizes that the application and detail drawings provided are for illustrative purposes only and may not be applicable to all building designs or product installations. All projects must conform to applicable building codes. Metal Sales Manufacturing Corporation is not responsible for system performance if installation does not adhere to suggested instructions or approved erection drawings. Prior to ordering and installing materials, all dimensions should be verified by field measurements. Oil canning is noted as not being a cause for rejection. Metal Sales reserves the right to modify details, recommendations, or suggestions without notice.
Conclusion
The Metal Sales Image II roofing system provides a durable and aesthetically versatile roofing solution. Successful installation relies on careful adherence to the provided guidelines, including proper substructure preparation, accurate fastening techniques, and attention to detail during component installation. Understanding the system’s specifications, limitations, and fire resistance ratings is crucial for ensuring a long-lasting and code-compliant roof.