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Metal Roofing and Siding Frequently Asked Questions

Do you have questions regarding AEP Span metal roofs and metal wall panels?  Below is a list of the most common questions and information which will help you learn more about AEP Span products.

  1. Why are Standard Colors more readily available than custom colors?

    All of the coils from which panels are produced are prefinished and stocked on the production floor, slit to the width necessary to rollform the profiles we offer. This is necessary to be able to respond to construction schedules without adding to the production time required for the coil-coating, slitting, and coil delivery process to our seven manufacturing facilities

  2. Why do custom colors have minimums and cost more?

    The length of the uncoiled strip to pass through the coil-coating process is roughly 4500 sq. ft. Short runs of a custom color require substantially greater production down time for the coil coater, involving the special handling of one coil coupled with the setup and cleaning process to switch to another color which could possibly be a different gauge and coil width. Also, the cost of custom formulated colors, in small quantities, is greater than the standard colors which are coated in much larger quantities. It is also necessary for us to have to coat more than the ordered amount in order to be able to have enough strip of the custom color to handle production culls, shipping damage, jobsite/installation damage, and measurement errors by our customer.

  3. Why do you have different paint systems on some panels?

    AEP Span produces panels for two distinct markets: 1.)AEP Span: Commercial/Industrial/Institutional, and 2.) AEP Span: Metal Building Systems. The first group generally utilizes heavier gauge panels specified by an Architect hired by an Owner for a one-of-a-kind building. The Owner is a long time tenant, and expects long term performance. The remaining markets are more price-sensitive, requiring the industry to respond with appropriately priced products.

  4. What are the minimum slope requirements for roof panels?

    Suggested slope requirements for specific profiles can be found on individual product profiles found in Architectural Roof and Wall Products and Commercial and Industrial Building Products sections, within the product guide or within the Product Guide/Catalog.

  5. Why are there slope limitations for different roof panels?

    Maximum slope is usually not at issue, it is the minimum recommended slope that is typically the limitation. If AEP Span produced only one panel, we would make it work at any slope. We produce numerous through-fastened panels, as well as eleven concealed fastener or standing seam panels. Rib design, rib height, coupled with the panel termination (top end, rake) assembly all play into the decisions for Manufacturers to publish recommended minimum slope limitations.

  6. Why standing seam vs. through-fastened panels?

    Performance and aesthetics. Single panels in excess of 30’ require the ability to be able to expand and contract, independently of the structure. Temperature fluctuations during the various seasons of the year create thermal movement of the panels and flashings (trim). Standing seam panels are designed to move over concealed clips, allowing non-destructive thermal movement. Since AEP Span markets our panels throughout the entire United States including Alaska and Hawaii, we have to be able to meet the requirements of all geographical conditions. Forces placed upon the screws that penetrate long length through-fastened panels can cause the screw’s compression washer to lose its seal and create a leak. The forces of expansion and contraction can create an elongated hole at the screw location, and jeopardize these metal panels’ weathertightness and attachment. With the increased usage of metal panels on high-slope roofs, rather than just for low-pitched Metal Building roofs, Owners and Architects prefer to avoid to seeing the exposed screws attaching the panel to the structure. Except for canopies, through fastened panels are not recommended for slopes less than 1:12. In these cases, a standing seam metal roof is preferred.

  7. What panel lengths do you stock?

    No panels are stocked in specific lengths. ASC Profiles rollforms all panels from prefinished steel coil to the nearest 1/8” in length after a cut list is received from our Customer.

  8. I am designing a building with a metal roof/wall and need more detail. What do I do?

    We try to publish the most commonly used details, but cannot possibly foresee every situation that could be utilized by a Designer. ASC Profiles has four full-time Technical Representatives and a staff of Engineers on-call, specifically to assist with attachment, panel usage and selection, and flashing alternatives.

  9. Why the extended lead time for production and delivery on jobs 100 squares and over?

    There is a limit for the quantity of coil inventory we can stock at our nine manufacturing locations. ASC Profiles has made a commitment to be able to respond to any order up to 100 squares for the popular panels, colors and gauges within 10 production days. Depending on the specific plant’s backlog, the lead time could be less. With over 30 Sales Offices throughout the U.S. and their Customers depleting inventory on a daily basis, a 40,000 sf order, for example, could deplete the supply, and negate us supplying the smaller quantities for the faster pace retrofit and small building construction. Seven weeks lead time required for orders of 100 squares or more is well within the construction schedule for all buildings as long as the General Contractor awards his Subcontractor the contract at the beginning of the project and the Owner is timely in selecting a color to be backlogged allowing for the coil(s) to be ordered and delivered to the proper ASC Profiles facility.

  10. Why don't your colors match the other Manufacturer that I specified?

    All panel Manufacturers vary when comparing panel selection, gauges available, and standard color selection. Each Manufacturer has its own strategy concerning inventory levels and popularity of colors in their geographical market area. Specifying a Manufacturer’s particular panel and a specific color taken from its color chart versus specifying the color to be selected from the Manufacturer’s standard offering decreases competition. Selecting a color prior to the bid places all Manufacturers not having that color at a disadvantage in bidding the project.

  11. Why doesn't AEP Span have snow guard details/products?

    AEP Profiles is a panel Manufacturer, and does not manufacture snowretention devices. It is our opinion that structures be designed for snow to be allowed to exit roof surfaces naturally, avoiding ice dams and build up in valley areas. Due to the large geographical area in which we market, snow loads and snow density vary to a great degree. Should the intent be to restrain snow from exiting roof surfaces, the Architect designing structures in his locale is more qualified to assess this situation. AEP Span is familiar with all of the snow guard Manufacturers, and can pass along information for several designs that are compatible to specific AEP Spans’ panels. Snow guard Manufacturers will advise the Architect of the number, placement, and attachment of these devices.

  12. I like the natural look of Zincalume®/Galvalume. Is there a difference in the Warranty?

    Zincalume®, the zinc and aluminum alloy coating on the majority of AEP Spans’ exterior steel panels, is present on both sides of the panel whether it is finished with a pigmented color or not. Zincalume®/Galvalume Plus finish is warranted for 25 years.

  13. What is Zincalume®/Galvalume Plus?

    All of our exterior panels (as opposed to structural deck) can be furnished with the ZINCALUME® Plus finish (no paint). This finish is the natural zinc and aluminum alloy, on both sides of the panel, coated with a clear low gloss acrylic. This allows AEP Span to produce a dry, non-oily panel, which minimizes scuffing caused by foot traffic, or displaying the dark smudging as a result of handling during stacking, shipping and installation. This results in a more uniform appearance required for high slope applications, and increases safety on the construction site by providing greater foot traction.

  14. What is Drag Load?

    Drag load is the force imposed upon a sloped panel caused by gravity and sliding snow. Standing seam panels, those attached to the roof structure with concealed clips, are free to “float” with expansion and contraction. If left completely free, they would slide off the roof. Drag load has to be combated by “fixing” one end of a standing seam panel. This is typically accomplished under the ridge/peak flashing to conceal the screw. At the “fixed” point, the panel is through fastened to the substrate. The type and number of screws needed, per panel, to resist drag load forces are determined by investigating the substrate material, slope, length of panel, panel width, and geographical snow load.

  15. Which AEP profiles can be used for roofs?

    Design Span®hp, HR-36® Roof & Wall, Mini-V-Beam, Nu-Wave® Corrugated,Reversed Box Rib, Select Seam®, Span-Lok, Span-Lok hp and SpanSeam, and U-Panel.

  16. Which AEP profiles can be used for walls?

    Box Rib Wall, HR-36® Roof & Wall, Flex Series, Flush Panel, Prestige Series®, Mini-V-Beam, Nu-Wave® Corrugated, and U-Panel.

  17. Which AEP profiles can be curved?

    Select Seam®, Span-Lok, and SpanSeam and Nu-Wave® Corrugated.

    Profiles that can be crimp-curved: HR-36® Roof & Wall, Box Rib Wall, U-Panel and Nu-Wave® Corrugated.

  18. Which AEP profiles span open framing?

    Design Span®hp, Span-Lok, Span-Lok hp and SpanSeam, Prestige Series®, HR-36® Roof & Wall, Box Rib Wall, Nu-Wave® Corrugated, and U-Panel.