Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
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title: Metal Roof Panels
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## Wind Uplift {note}
−### Wind uplift is the dominant structural demand on a metal roof; the panel-and-clip assembly must resist the net uplift pressure at field, perimeter, and corner zones determined from the site design wind speed. {note}
+### Wind uplift is the dominant structural demand on a metal roof; the panel-and-clip assembly must resist the net uplift pressure at field, perimeter, and corner zones determined from the site design wind speed.
### The panel system shall be tested for structural performance under uniform static air pressure difference in accordance with ASTM E1592.
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### The roof assembly shall carry a fire classification in accordance with ASTM E108 or UL 790 meeting the class required by the authority having jurisdiction.
−### Where a UL-listed assembly is specified, the assembly shall carry a UL 790 listing for the required class; a UL 790 listing satisfies ASTM E108 but the reverse is not true. {note}
−
```datasheet
label: Roof Fire Classification
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```
+### Where a UL-listed assembly is specified, the assembly shall carry a UL 790 listing for the required class; a UL 790 listing satisfies ASTM E108 but the reverse is not true. {note}
+
## Thermal Movement {note}
−### A long metal panel run expands and contracts significantly with temperature; the clip and seam must accommodate that movement or the panel will buckle and the clip slots will tear. {note}
+### A long metal panel run expands and contracts significantly with temperature; the clip and seam must accommodate that movement or the panel will buckle and the clip slots will tear.
### The panel system shall accommodate thermal movement resulting from an ambient surface temperature range of -20 °F to 180 °F without buckling, seam separation, fastener fatigue, or noise.
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# Environmental and Service Conditions {toc}
−## The base metal and coating shall be selected for the corrosivity of the service environment, including coastal salt exposure, industrial pollutants, and agricultural ammonia. {note}
+## The base metal and coating shall be selected for the corrosivity of the service environment, including coastal salt exposure, industrial pollutants, and agricultural ammonia.
## Aluminum or coated aluminum panels should be specified in marine and coastal environments within roughly one mile of salt water where bare and galvanized steel corrode rapidly. {note}
## Aluminum panels shall be specified where the service environment is coastal, marine, or otherwise highly corrosive to steel.
−## Bare Galvalume panels shall not be used in environments with standing water, animal confinement, or continuous condensation, where the aluminum-zinc coating degrades. {note}
+## Bare Galvalume panels shall not be used in environments with standing water, animal confinement, or continuous condensation, where the aluminum-zinc coating degrades.
## Bare Galvalume panels shall not be used in animal-confinement or continuously wet environments.
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## Clips and Attachment {note}
−### Clips transfer uplift from the panel to the structure and, on long runs, allow the panel to move; clip material and design must suit both the panel metal and the thermal movement demand. {note}
+### Clips transfer uplift from the panel to the structure and, on long runs, allow the panel to move; clip material and design must suit both the panel metal and the thermal movement demand.
### Clips shall be of the type and material recommended by the panel manufacturer for the specified panel, slope, and design uplift.
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## Fasteners {note}
−### Concealed clip fasteners and exposed panel fasteners both must resist pull-out under uplift and corrosion over the service life; exposed fasteners additionally seal the penetration. {note}
+### Concealed clip fasteners and exposed panel fasteners both must resist pull-out under uplift and corrosion over the service life; exposed fasteners additionally seal the penetration.
### Concealed fasteners securing clips to the structure shall be corrosion-resistant and sized for the design uplift pull-out load.
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## Sealants and Butyl Tape {note}
−### Standing seam joints and low-slope conditions rely on a continuous sealant bead inside the seam; the sealant must be compatible with both the coating and the base metal or it can react, lose adhesion, or void the finish warranty. {note}
+### Standing seam joints and low-slope conditions rely on a continuous sealant bead inside the seam; the sealant must be compatible with both the coating and the base metal or it can react, lose adhesion, or void the finish warranty.
### Seam sealant and butyl tape shall be the type approved by the panel manufacturer for the specified panel and coating.
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# Installation {toc}
−## General {note}
+## The panel system shall be installed in accordance with the manufacturer's instructions, the approved shop drawings, and the approved mockup.
−### The panel system shall be installed in accordance with the manufacturer's instructions, the approved shop drawings, and the approved mockup.
+## Panels shall be installed straight, true, and in alignment, with seams plumb and parallel.
−### Panels shall be installed straight, true, and in alignment, with seams plumb and parallel.
+## Installation should follow the applicable details of the NRCA Roofing Manual for metal panel roof systems where a project detail is not provided. {note}
−### Installation should follow the applicable details of the NRCA Roofing Manual for metal panel roof systems where a project detail is not provided. {note}
−
## Substrate Preparation {note}
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### Clips shall be fastened to the structure at the spacing established by the tested assembly, with floating clips set to permit the calculated thermal travel.
−### Field-cutting of panels shall be performed with tools that do not damage the coating; abrasive saws that throw hot metal filings onto the finish shall not be used. {note}
+### Field-cutting of panels shall be performed with tools that do not damage the coating; abrasive saws that throw hot metal filings onto the finish shall not be used.
### Panels shall not be cut with abrasive saws or torches that deposit hot metal particles on the finish.
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## Panels shall be delivered in the manufacturer's packaging with labels identifying profile, gauge, finish, and color intact.
−## Panels and accessories shall be stored off the ground, on a slope, and covered with a breathable cover to prevent water entrapment and white-rust staining of bare or Galvalume surfaces. {note}
+## Panels and accessories shall be stored off the ground, on a slope, and covered with a breathable cover to prevent water entrapment and white-rust staining of bare or Galvalume surfaces.
## Bundled panels shall be stored elevated at one end so that any entrapped moisture drains and does not pond between nested panels.
−## Panels stored on site shall be kept dry, as trapped moisture between nested panels causes water staining and coating damage. {note}
+## Panels stored on site shall be kept dry, as trapped moisture between nested panels causes water staining and coating damage.
## Panels shall be handled to prevent bending, denting, and abrasion of the finish, and shall be lifted rather than dragged across one another.
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- Touch-up coating
```