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Snow Guards for Standing Seam Roof Panels by McElroy Metal
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Snow Guards for Standing Seam Roof Panels by McElroy Metal

Posted by Derek Gamble - SnoBlox-Snojax Specialist on Apr 10th 2024

McElroy Metal roofing logo on white background - image courtesy of mcelroymetal.com

See the Snow Guards Compatibility Chart for McElroy Standing Seam Metal Roofing Panels.

This continuing blog series intends to highlight prominent metal panel producers and provide recommendations for compatible snow guard solutions. The aim is to empower customers by guiding them through this process. Today's metal roofing market features a vast array of panel options. While this extensive variety is excellent for today's consumer, it can also lead to decision fatigue.

McElroy 138T panel mounted on roof - image courtesy of mcelroymetal.com

Standing Seam Roof Panels by McElroy Metal

Established in 1963, McElroy Metal has evolved into a nationwide corporation with 14 manufacturing facilities, 28 service centers, and 44 Metal Mart outlets spread throughout the United States. The company continues to operate under the principle of treating customers as they would want to be treated by their suppliers, which they acknowledge may be old-fashioned but effective. In 2023, after three generations of family ownership, McElroy transitioned to an employee-owned company, with the president citing the loyal and long-serving employees as the driving force behind the company's success over its 60-year history.

138T and 238T Standing Seam Roofing Systems

The 138T and 238T standing seam roofing systems represent a technological advancement in roofing, surpassing traditional methods with their innovative features. Classified as symmetrical standing seam systems with mechanically seamed caps, they offer patented solutions for covering existing metal or shingle roofs, setting a new standard for performance. Their standout feature lies in their ease of repair and alteration after installation, allowing easy replacement of individual panels and ensuring long-term durability. With Galvalume® boasting a roof life expectancy of nearly 60 years, this ability to replace panels becomes paramount. See the Snow Guards Compatibility Chart for McElroy 138T and 238T Standing Seam Metal Roofing Panels.

McElroy Metal Blue 238T Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

The 138T and 238T get their names from their rib heights at 1-3/8" and 2-3/8" heights, respectively. The 138T is available in 12", 16", and 18" panel widths, while the 238T is available in 16", 18", and 24" widths. (24" width must be formed on-site). 138T must be installed over solid decking, while 238T is installable over open framing or solid deck. The 138T and 238T standing seam roofing systems are available in standard 24 gauge galvalume, optional 22 gauge galvalume, optional .032 and .040 aluminum, and optional 16 oz and 20 oz copper (Houston Plant Only). Both panels have a minimum slope requirement of 1:12. They are available in various configurations featuring different minor rib and striation styles. Curving these panels is possible for radiused roofs but has specific minimum radiuses for each style.

The 138T and 238T panels offer various snow retention options due to their multiple panel widths and seam shapes. These panels are well-suited for use with glue-down polycarbonate snow guards. To ensure proper sealing and prevent moisture from seeping underneath the snow guard, you may need to apply a more generous amount of adhesive to account for the different striation options. Failure to seal gaps could result in snowmelt trapped beneath the guards, leading to re-freezing and detachment, ultimately causing system failure. Customers seeking larger snow guards compatible with this panel can choose the IceJax II, Snojax II, or SnoBlox Ace. Conversely, those preferring smaller footprint guards may opt for the Deuce and IceJax I. To promote the safer shedding of snow and ice, the SnowBreaker and SnowBreaker 3M are ideal choices. This panel's T-shaped rib design fits our clamp-on SnoCleat RCT and the SnoBar and ColorBar systems when paired with the RCB-3 bracket and aluminum RoofClamp RCT attachments. While the panel features a mechanically fastened cap, it only covers the seam's top. It does not affect the clamp-on snow retention attachment. Because copper and aluminum are softer than steel, it may be necessary to install more rows of rails on these roofs than steel roofs to account for this difference in panel strength. When mounting this panel on a radiused roof, we advise against using glue-down pad-style guards, recommending clamp-on guards or rails instead. Pad-style guards require a perfectly flat mounting surface for proper installation.

Instaloc Snap Lock Standing Seam Panels

Instaloc presents a snap-together standing seam system, showcasing a 1" seam and installation via concealed clips. This panel requires installation over solid decking. Instaloc's low-profile seam is optimal for light commercial and residential applications. This panel features an unusual width of 13" and is available only in standard 24 gauge Galvalume with a minimum slope requirement of 3:12. This panel comes in striated, plank, and minor rib configuration options. See the Snow Guards Compatibility Chart for McElroy Instaloc Snap Lock Standing Seam Metal Roofing Panels.

McElroy Metal Blue Instaloc Snap Lock Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

Instaloc is compatible with a variety of snow retention options. This panel is compatible with our glue-down polycarbonate snow guards, depending on the striation pattern selected. You may need to apply a more generous amount of adhesive to accommodate the panel's optional striation patterns. Applying a suitable amount of adhesive ensures complete sealing to prevent gaps and moisture infiltration beneath the guards, which could freeze and expand, leading to detachment from the roof panel. For customers seeking larger snow guards for this panel, SnoBlox Ace and IceJax II are recommended choices. Customers preferring snow guards with a smaller footprint may opt for Deuce and IceJax I. SnowBreaker and SnowBreaker 3M are excellent choices for customers not wanting to hold snow and ice on their roofs. These snow guards will slow it down and cut it into safer chunks while it sheds. The rib shape of this panel allows compatibility with all clamp-on snow guards, including SnoCleat RC, SnoCleat RCT, SnoBar, and ColorBar systems, utilizing either standard SnoBar clamps or RoofClamp attachment options.

MasterLok-90 and MasterLok-FS Trapezoidal Panels

The ML-90, also known as MasterLok-90, is a trapezoidal standing seam panel that easily snaps together, designed specifically for projects with slopes starting at 1/4:12. Similarly, MasterLok-FS, or ML-FS, a trapezoidal hidden fastener panel that is mechanically seamed, is also intended to accommodate slopes as low as 1/4:12. The panel options ideally suit straightforward sloped roofs lacking dormers, hips, valleys, or other specialized conditions. Whether installed over solid decking or substructural members, ML-90 and ML-FS provide versatile solutions for various roofing projects. These panels feature 3" tall trapezoidal ribs on 24" rib spacing and are available in 22 and 24-gauge thickness options. Both panels have a minimum slope requirement of ¼:12. These panels have a unique feature called MoistureLok, a factory-applied anti-condensation membrane. MoistureLok traps moisture and releases it into the air as natural humidity when conditions become less humid. See the Snow Guards Compatibility Chart for McElroy MasterLok-90 and MasterLok-FS Trapezoidal Standing Seam Metal Roofing Panels.

McElroy Metal Blue MasterLok-90 Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

The MasterLok-90 and MasterLok-FS panels provide a range of options for snow retention. These panels are particularly suitable for use with glue-down polycarbonate snow guards. It's essential to apply the glue generously to the bottom of the snow guards to ensure proper sealing and prevent moisture from seeping underneath, especially considering the various striation options. Failing to seal gaps could trap water beneath the guards, causing re-freezing and detachment, ultimately resulting in system failure. The minor ribs of this panel closely resemble those of an R-Panel or PBR-style panel. We recommend the SnoBlox Deuce if you're seeking a guard to center on the panel between the minor ribs. Options such as IceJax I, IceJax II, and Snojax II are excellent for mounting over the minor ribs. If you prefer allowing snow and ice to shed slowly and safely in smaller pieces, SnowBreaker and SnowBreaker 3M should be selected. Thanks to the rib shape of this panel, it is compatible with the SnoCleat RC, SnoCleat RCT, SnoBar, and ColorBar systems. You can use these rail systems with optional aluminum RoofClamps or standard stainless steel SnoBar clamp attachments.

Maxima Standing Seam Panel

McElroy's Maxima product line offers a comprehensive selection of vertical leg standing seam systems with three distinct profiles: Maxima, Maxima 1.5, and Maxima ADV, catering to the diverse aesthetic and performance requirements of architects and contractors. Contractors can produce some Maxima panels on-site, while Maxima 1.5" and 2" panels adapt well to curved applications. All Maxima panels are mechanically seamed and meant for installation over open framing or solid decking. These panels are available in 12", 16", and 18" panel widths, depending on the profile selected. They are available in a variety of rib and striation configurations. The 1.5" panels have a minimum slope requirement of 1:12. In contrast, the 2" panels require a ½:12 slope, and the 3" panels require a ¼:12 slope. These panels come in standard 24 gauge galvalume, while options for 22 gauge galvalume, .032 aluminum, and .040 aluminum are also available. See the Snow Guards Compatibility Chart for McElroy Maxima Standing Seam Metal Roofing Panels.

McElroy Metal Blue Maxima Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

Maxima panels are versatile and compatible with various snow retention systems. These panels are compatible with glue-down polycarbonate snow guards. However, it's important to note that a thicker adhesive application may be necessary to accommodate the panel's optional striation patterns, ensuring complete sealing to prevent gaps and moisture infiltration beneath the guards, which could freeze and expand, leading to detachment from the roof panel. IceJax II and SnoBlox Ace are great options for customers seeking larger snow guards. Those preferring a smaller footprint may opt for Deuce and IceJax I. Customers not wanting to hold snow and ice on their roofs but still wanting to slow it down and cut it into safer pieces can consider SnowBreaker and SnowBreaker 3M. The rib shape of the Maxima panel allows for compatibility with our clamp-on SnoCleat RC, SnoCleat RCT, SnoBar, and ColorBar systems. These can be attached using either standard SnoBar clamps or RoofClamp attachment options. Because copper and aluminum are softer than steel, it may be necessary to install more rows of rails on these roofs, as opposed to those on steel roofs, to account for the difference in panel strength. When mounting the Maxima panel on a radiused roof, it is advisable to use clamp-on guards or rails instead of glue-down pad-style guards. The latter requires a perfectly flat mounting surface for proper installation.

Medallion I and Medallion II Batten Seam Panels

Medallion I and Medallion II represent two distinct architectural standing seam systems, each employing batten caps affixed over adjoining roofing panels. Medallion I is characterized by a slender batten cap, whereas Medallion II features a broader cap design. McElroy specifically designed both Medallion systems for installation over sturdy, solid decking. Additionally, Medallion I offers the flexibility to be curved to accommodate radius panel requirements as needed. These panels are available in 12", 16", and 18" panel spacing with striated, ribbed, or flat pan panel configurations. These panels are only available in 24 gauge galvalume and require a minimum of a 3:12 roof slope. See the Snow Guards Compatibility Chart for McElroy Medallion I and Medallion II Batten Seam Metal Roofing Panels.

McElroy Metal Blue Medallion II Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

Customers can utilize both Medallion I and Medallion II panels for flat or curved installations. However, the rib shape of these panels limits the options for snow guards. Separate batten strips prevent the integration of clamp-on individual snow guards or continuous rail systems with these panels. Typically, companies employ batten strips for aesthetic purposes, enhancing the visual continuity between adjacent panels. We always advise against clamp-on systems when a separate full-coverage batten strip is present on a standing seam panel, as the clamps only fasten onto the strip itself, potentially failing to exert adequate torque on the panels, resulting in the disengagement of the strips from the roof and necessitating extensive and costly repairs. We recommend using glue-down polycarbonate snow guards for Medallion panels only if the roof is flat. Individual polycarbonate snow guards require a flat mounting surface for proper installation.

Additionally, it's important to note that these panels feature minor striations, which may require a thicker application of Surebond SB-190 adhesive to effectively fill the gaps between the panel and the guard. We have no solution for this panel on a radiused roof. We advise contacting McElroy directly for guidance.

Medallion-Lok Snap Lock Panels

Medallion-Lok perfectly encapsulates the grace and allure of a standing seam roof, enhancing the aesthetic appeal of any structure. With its slender 1.75-inch height, the standing seam delivers sharp, refined visual aesthetics. Medallion-Lok showcases concealed clips and a seamless snap-together mechanism, removing the need for on-site seaming. See the Snow Guards Compatibility Chart for McElroy Medallion-Lok Snap Lock Standing Seam Metal Roofing Panels.

McElroy Metal Blue Medallion-Lok Standing Seam Metal Roof Panel On White Background

Although primarily favored for commercial applications, Medallion-Lok is also an exceptional option for expansive, bespoke residential properties. This panel is available in 12", 16", and 18" widths with a minimum slope requirement of 3:12, and striated, ribbed, or flat pan panel configurations are available. This panel comes standard in 24 ga galvalume but has 22 ga galvalume and .032 aluminum options.

The Medallion-Lok panel design allows for multiple snow retention options. The Medallion-Lok's seam shape makes it compatible with our clamp-on snow guard systems, including the SnoCleat RC, SnoCleat RCT, SnoBar, and ColorBar options. The IceJax II and SnoBlox Ace are fantastic for larger Medallion-Lok panel configurations. A more liberal application of adhesive may be required to account for the panel's minor striations, fill gaps, and prevent moisture from getting under the glue-down polycarbonate snow guards, as trapped moisture could freeze, expand, and dislodge the guards from the roof. For smaller panel widths, the Deuce and IceJax I may be preferred by customers.

Meridian Snap Together Metal Roofing

Meridian Snap Together panels are a comprehensive metal roofing solution! This product presents a visually appealing standing seam roof panel that effortlessly snaps together, featuring both affordability and straightforward installation. Dispensing with the necessity for clips, Meridian panels securely attach to the roof deck using pancake head fasteners. Versatile enough for both commercial and residential projects, Meridian consistently stands out as a top-notch option! This panel is available in 12" and 16" panel widths and comes in galvalume in 24 and 26-gauge options. This panel has a required minimum slope of 3:12. See the Snow Guards Compatibility Chart for McElroy Meridian Snap Together Standing Seam Metal Roofing Panels.

McElroy Metal Blue Meridian Snap Together Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

The Meridian panel features a "nail strip" design. This panel's seams are incompatible with our SnoCleat RC, SnoCleat RCT, SnoBar, or ColorBar options. However, it does work well with all of our glue-down polycarbonate pad-style snow guards, depending on the chosen striation or rib pattern. Options such as the IceJax II, Snojax II, and SnoBlox Ace are compatible for those who prefer larger guards. Customers may choose the Deuce and IceJax I models for smaller panel sizes. Those who aim to prevent snow and ice buildup on their roofs, opting instead to slow it down and break it into safer pieces, may find the SnowBreaker and SnowBreaker 3M systems suitable for their needs. It's advisable to use a heavier application of adhesive to accommodate the panel's striations, fill gaps, and prevent moisture from seeping under the snow guards, as trapped moisture may freeze and dislodge them from the roof.

Mirage II Metal Roofing

Mirage II is a roofing panel designed for easy assembly, utilizing concealed fasteners and featuring ribs spaced 8 inches apart. It has a seam height of 1 3/4 inches and requires solid decking or substructural members for proper installation. For slopes measuring less than 3:12, the factory-applied sealant is necessary; nevertheless, you can install Mirage II on slopes as low as 1/4:12. Widely adopted in the mini-storage sector due to its suitability for shorter length panels, Mirage II benefits from specialized contractors who have devised effective systems and details for its application, particularly in lower slope scenarios. This panel has a total coverage of 16", with the only thickness option available being 24 ga galvalume. See the Snow Guards Compatibility Chart for McElroy Mirage II Standing Seam Metal Roofing Panels.

McElroy Metal Blue Mirage II Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

The Mirage II panel's unconventional rib spacing and shape drastically limit the snow guard options for this panel. Firstly, this panel's seams are incompatible with our clamp-on product options, including our SnoCleat RC, SnoCleat RCT, SnoBar, or ColorBar options. Unfortunately, information regarding the minor rib spacing of this panel was hard to obtain. The SnoBlox Deuce, SnowBreaker, or SnowBreaker 3M are likely the best options for this panel. We recommend purchasing a sample from our website for a test fit before placing your order.

Trap-Tee Metal Roofing

McElroy's innovative Trap-Tee system is a 2 3/4" tall symmetrical solution designed to overcome the common shortcomings of trapezoidal standing seam roof systems. This mechanically seamed system sets a new standard in roofing technology by eliminating potentially leaking end-laps through site-formed construction and enhancing wind uplift resistance with oversized seams and specialized clips. With a lifespan nearing 60 years, it offers unmatched versatility. This panel has 18" and 24" widths available with 20, 22, and 24-gauge galvalume thickness options. This panel requires a ¼:12 minimum roof pitch. See the Snow Guards Compatibility Chart for McElroy Trap-Tee Standing Seam Metal Roofing Panels.

McElroy Metal Blue Trap Tee Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

Trap-Tee is ideally suited for pairing with smaller glue-down polycarbonate snow guards like the SnoBlox Deuce, SnowBreaker, and SnowBreaker 3M. Its T-shaped rib design ensures compatibility with our clamp-on SnoCleat RCT and the SnoBar and ColorBar systems when installed with the RCB-3 bracket and aluminum RoofClamp RCT attachments. Despite featuring a mechanically fastened cap, it exclusively covers the top of the seam, leaving the clamp-on snow retention attachment to the vertical rib unaffected.

RidgeLine Roof Panel

According to McElroy, RidgeLine is the leading insulated standing-seam roof panel in the IMP (Insulated Metal Panel) industry. Its unique tee-seam design facilitates the sliding of panels together, eliminating the need for lifting or rolling during installation. RidgeLine ensures a double layer of weather-tight protection with an interior tongue-and-groove joint and factory-caulked batten. RidgeLine offers a 42-inch cover width and comes in thicknesses ranging from 2 1/2 inches to 5 inches. See the Snow Guards Compatibility Chart for McElroy RidgeLine Standing Seam Metal Roofing Panels.

McElroy Metal Grey RidgeLine Standing Seam Metal Roof Panel On White Background - image courtesy of mcelroymetal.com

RidgeLine panels feature a tight ridged striation pattern, and as such, we do not recommend a glue-down pad-style guard for this panel. The panel's T-shaped rib design is compatible with clamp-on SnoCleat RCT and ColorBar systems when used with the RCB-3 bracket and aluminum RoofClamp RCT attachments. SnoBar is not compatible with panels larger than 24", whereas ColorBar can handle the broad width of this panel easily. Although the panel features a mechanically fastened cap, it solely covers the seam's top. It doesn't interfere with clamp-on snow retention attachments.

McElroy Metal Snow Guards Compatibility Chart

  138T & 238T Profile Instaloc Snap Lock Profile MasterLok-90 MasterLok-FS Profile Maxima Profile

Medallion I and II Batten Profile

Medallion-Lok Profile Meridian Snap Together Profile Mirage II Profile Trap-Tee Profile RidgeLine Profile
IceJax I Glue Down YES YES YES YES YES YES YES NO YES NO
IceJax II Glue Down YES YES YES YES YES YES YES NO YES NO
SnoBlox Deuce Glue Down YES YES YES YES YES YES YES YES YES NO
SnoBlox Ace Glue Down YES YES YES YES YES YES YES NO YES NO
Snojax II Glue Down YES YES YES YES YES YES YES NO YES NO
SnowBreaker Glue Down YES YES YES YES YES YES YES YES YES NO
SnowBreaker 3M YES YES YES YES YES YES YES YES YES NO
SnoBar Standing Seam NO YES YES YES YES YES YES NO NO NO
ColorBar Standing Seam NO YES YES YES NO YES YES NO NO NO
SnoBar RCB-3 YES YES YES YES NO YES YES NO YES YES
ColorBar RCB-3 YES YES YES YES NO YES YES NO YES YES
SnoBar 2-Bar YES YES YES YES NO YES YES NO YES YES
ColorBar 2-Bar YES YES YES YES NO YES YES NO YES YES
SnoCleat RC NO YES YES YES NO YES YES NO NO NO
SnoCleat RCT YES YES YES YES NO YES YES NO YES YES

Seven Factors to Consider Before Purchasing and Installing Snow Guards for McElroy Standing Seam Roofing

1. How Does the Layout of a Snow Retention System Impact Its Performance?

No matter the type of snow retention system selected, seeking layout guidance from the manufacturer is crucial. We offer free advice and resources to guarantee proper installation, including spacing charts and custom quote request forms. An adequately installed snow guard or rail system extends across the entirety of the roof, with multiple rows ascending the slope to distribute weight evenly. Isolated placements above doorways, HVAC units, or chimneys are discouraged due to their increased risk of failure.

2. Are IceStoppers Necessary for My Snow Rail System?

When utilizing SnoBar or ColorBar snow rail systems on standing seam roof panels, it's advisable to consider incorporating IceStopper attachments, especially in areas above pedestrian walkways or parking lots. IceStoppers can be installed during the initial setup or added later as a retrofit option. Ensuring the correct spacing of IceStoppers is critical for effectively managing snow and ice accumulation on the roof.

3. Should Screw-Down Snow Guards and Snow Rails Be Used on Standing Seam Roofs?

Never use screw-down mechanically fastened snow guards and snow rails on standing seam metal roofing panels! This type of installation can pose risks to the panels over time because of the roof's floating nature and its tendency for thermal expansion and contraction. This approach may result in roof leaks, costly repairs, and void the manufacturer's warranty. Instead, we recommend standing seam-compatible clamp-style or adhesive-mounted snow retention systems.

4. Should I Order Samples to test fit?

Before finalizing your purchase, you should test fit any snow guards, clamps, brackets, or IceStoppers to ensure they function correctly with your specific project. Our website allows you to order these items without minimum requirements. Furthermore, we offer 20" and 27" bar sample kits to facilitate this process. Investing in these samples can prevent substantial expenses if the product doesn't fit during the installation, making it a prudent precaution before making your purchase decision.

5. Determining Ground Snow Load: Why It Matters

Understanding your ground snow load is crucial when considering snow retention systems for metal roofs. Most snow retention systems are suitable if your ground snow load is 45 pounds per square foot (psf) or lower. However, in regions where snow loads exceed 45 psf, it's advisable to opt for snow rail systems with enhanced holding capabilities. If your metal roof panel isn't compatible with snow rails, contact the panel manufacturer for their recommended snow guard solution. Ground snow load information is obtainable through a web search, referencing building plans, or contacting local authorities.

6. Can Snow Guards be Color-Matched?

Our selection of metal snow retention solutions offers color-matching capabilities. The SnoCleat RC, SnoCleat RCT, and ColorBar Snow Rail Systems are all compatible with slide-in metal strips that match your roof's color scheme. Order these strips with the guards or cut your own from leftover materials at the job site. Furthermore, we provide custom powder coating services to ensure precise color matching across all models of SnoCleat, SnowCatcher, and snow rail systems. Powder coating guarantees seamless integration of your snow guards and rails with your roofing panels, maintaining a consistent aesthetic for your building. It's important to note that powder-coated products are custom-made and require additional production and delivery time. Additionally, custom colors may incur surcharges, depending on the specific color and scale of the project. Before placing an order, please provide a physical color sample for accurate matching.

7. Is Timing Important When Installing Glue-Down Snow Guards?

While clamp-on snow guards and rail systems feature a year-round installation window as long as the roof is free of snow, ice, and debris, the timing for applying glue-down snow guards requires careful consideration. The industry-standard adhesive, Surebond SB-190, typically requires approximately 28 days at 50 degrees Fahrenheit to cure completely. For customers in the USA and Canada, late spring or early summer is considered the optimal time for installation. After 24 hours, rain will not have any detrimental effects on the adhesive. It's crucial to emphasize that the installation of snow guards using Surebond SB-190 adhesive on copper roofing is discouraged due to the potential for a chemical reaction that may accelerate the corrosion of the panels.

Conclusion

Selecting the right snow guard for your project can be tricky, but we are here to help. Look out for more tips on different roofing styles and brands in the future. It's essential to have a knowledgeable company assist you when buying snow guards. SnoBlox-Snojax is committed to supporting you every step of the way. For questions or orders, please email us at support@snojax.com or call 1-800-766-5291. Check out our "What Works and What Doesn't" page and Snow Guard Buyer's Guide for more helpful info.

THE SNOBLOX-SNOJAX SNOW GUARDS DIFFERENCE

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