ASTM Archives | ABC Metal Roofing

What You Need to Know About Insulated Metal Panels

Posted on June 28, 2018May 31, 2023 by Tyler Roose

Insulated Metal Panels (IMPs), simply put, are the insulated version of single-skin (uninsulated) metal panels. As the name suggests, IMPs provide insulation and, therefore, thermal control and barrier protection to structures. This helps ensure air, heat and moisture stay outside of a building, reducing the chances of mold, corrosion and rotting.

A versatile and practical choice, IMPs are designed for many roof and vertical and horizontal wall applications—including ceiling panels and wall partitions for commercial, industrial and post-frame building types. IMPs are ideal for sustainability-minded designs, offering excellent R-values (indicating their insulating power) and improving energy efficiency. What’s more, they’re available in various colors, thicknesses, widths and finishes, providing many customization options to choose from.

Here, we’ll take a look at some of the many benefits of using IMPs. Plus, we’ll review some factors to consider when deciding if IMPs are the right choice for a building project.

Choosing IMPs:

There are several important factors that go into the decision to use IMPs. While they offer tremendous benefits, it’s always good to research the product to ensure it meets your needs. The manufacturer, as always, is a great resource to help determine the optimal material and product, given all the parameters. Here are some of the main factors to consider.

Benefits of using IMPs:

Installation and Maintenance: IMPs have similar requirements to single-skin in terms of time and labor.
Longevity: IMPs can enhance the building lifespan, as they protect from unwanted and damaging heat and moisture.
Versatility: Available in a range of panel colors, thicknesses, widths and finishes, IMPs offer many customization options.
Energy Savings: Because they help regulate interior temperature, IMPs are more effective at energy conservation as compared to single-skin panels.
Energy Performance: Contractors and builders can use IMPs to achieve necessary energy performance levels with this single-source enclosure, providing a continuous blanket of protection.
R-Value Performance: IMP tests show thermal performance values up to R-8.515 (roof panels) and 7.08 (wall panels) per inch of panel thickness. i.e., a 2.5-inch-deep panel would easily meet the International Energy Conservation Code and ASHRAE minimums.
Cost: While generally more expensive than single-skin panels, this cost is often offset by long-term savings.
Tax Savings: Federal, state and/or local governments often offer incentives for using sustainable or “green” products that meet energy-efficiency requirements. Your personal tax advisor can share more information on any currently available incentive programs.

How to know if you need an insulated metal panel:

Building Type/End Use: Any structure that will hold people or goods should consider using IMPs. Specialized facilities that require reliable temperature and moisture regulation are excellent candidates for IMP use. These include refrigerated warehouses, research laboratories, government facilities, defense contractors, technology companies, MRI clinics and food production facilities, to name a few.
Geography and Weather: Depending on region/weather considerations, IMPs might be the best choice. To help determine if that is the case, you can calculate the functional amount of insulation needed in your area by using the minimum rated R-values method or the maximum U-factor assembly calculation. [For IMPs, the Maximum U-Factor Assembly calculations is recommended and can be tested using ASTM C1363.]
Meeting Fire Rating Requirements: To become fire-rated, IMP manufacturers can submit full-size product samples to a testing laboratory like Underwriters Laboratories (UL). The products are then tested according to standard, agreed-upon procedures such as ANSI/UL 263, “Standard for Fire Tests of Building Construction and Materials.” The manufacturer can provide confirmation as to whether a particular IMP meets the requirement for your project.

All things considered, the advantages IMPs offer often make them ideal for many building applications. This is particularly true when it comes to energy efficiency and sustainability for the post-frame, commercial, industrial and institutional markets. For more information on IMPs, check out ABC’s IMP resources or reach out to an ABC representative in your area.

Metal Roof Pitch Part II: Panel Selection for Your Building End-Use

Posted on October 18, 2017April 29, 2024 by Ken Buchinger

In part one of our series on metal panel roof pitch, we looked at the engineering and strength considerations that need to be taken into account when designing or specifying a building. In part two, we’ll review how to make the right metal panel selection for your building end-use by looking at the building type and roof pitch to find the optimal combination of form and function.

Types of roof panels:

Different types of metal roof panels are better suited for certain roof pitches and this mostly has to do with panel rib height and how they’re seamed together. For instance, the lower the pitch, the taller the rib of the roof panel needs to be in order to optimize water carrying capacity. Also, the lower the pitch, the slower water runs off the roof; combined with wind pressure, this can hold water at the eave. As an example:

On 2:12 and lower pitches for commercial/industrial jobs, weathertightness warranties will use a mechanically seamed panel because it creates an impenetrable lock that keep water from seeping between the panels. Seamed panels can be thought of as more hydrostatic (resistant to water), whereas non-seamed panels are hydrokinetic, i.e., water runs off of them, but they are not designed to be a water barrier.

Building Type and Use:

Whether residential, post-frame or commercial, structures follow general design criteria regarding metal roof slope, based on to the building type and use. For instance:

Gabled v. Hipped: gabled roofs provide more interior headroom while with hipped roofs, endwall sheet height can be reduced, making for easier ordering and installation as you don’t have to cut/miter the sheets.

Residential v. Post-Frame and Commercial Use: While it can generally be assumed that thicker-gauge panels are stronger, the type of building construction, location and end-use can affect the choice in panel thickness. Residential roofs generally have steeper slopes (often due to aesthetic sensibilities), while commercial and post-frame buildings will typically have a shallower pitch to increase the strength of the building. Buildings such as pole barns, post-frame buildings, warehouses and garages can require roof panels to span longer distances between supporting trusses and purlins and therefore require thicker panels to ensure the roof is structurally sound and can aid in reducing the chance of collapse under the weight of snow and water—particularly when the roof pitch is low. For smaller buildings—like residences—with supporting trusses and purlins that are typically closer together, thinner panels can be used in conjunction with thicker trim for an economic, structurally ideal residential metal roofing system. See our blog on metal panel gauges for more.
Economics: When a roof has a shallower pitch, less material is needed to cover the same roof span. This can be more economical since fewer square feet of material needs to be purchased, or at least help in offsetting the cost of the thicker panels commonly used on low-slope roof—a consideration often important to companies with multiple properties. Likewise, while more material may need to be purchased for a high-sloped roof, you may be able to buy thinner, less expensive panels since high-slope roofs don’t typically need to be able to support heavier loads like low-slope roofs do.
Aesthetics: Traditional residences typically feature a higher roof pitch while this may be less important to commercial building owners. However—from a functional standpoint—thicker panels can be more forgiving of installation errors such as over-tightened screws and aren’t as likely to transfer waves and bumps in sheathing.

Solar Panels and Roof Pitch:

The geographic location of a structure will determine the angle at which the solar panels should be installed. Generally. the closer to the equator you get, the lower the slope the solar panels can tolerate as roofs closer to the equator have more consistent exposure to sunlight as compared to those farther away. If you plan to add solar panels to your metal roof, be sure to check the Solar Reflective Index (SRI) values and minimum slopes set by the ASTM and local governing codes. These standards will advise adequate slope based on your location as well as help control things such as heat island effects, etc. For more information on solar reflectance and how it is affected by the color of your metal roof panels, see our blog post on cool metal roofs.

Conclusion:

Roof slope is a factor that affects many decisions when it comes to any metal building roofing project regardless of the building’s end use. When embarking on any metal roofing project, be sure that the panels you’ve selected meet local building codes and are produced by a quality manufacturer with knowledge and experience designing for different applications to ensure you get exactly what you’re looking for. For more information on metal panel selection for your building end-use and to learn more about recommendations on roof slope for different building types, contact your local ABC representative today.

Additional Resources:

For more information on slope requirements, visit NRCA’s website. For more information on steep-slope metal roofs and their benefits, visit the Metal Construction Association’s website.

Decoding Your Warranty: Paint Fade Protection

Posted on April 14, 2016March 24, 2023 by Casey Walker

Will a Metal Roof Lose its Color?

Paint fading is one of the biggest concerns voiced by metal roofing customers. Over time, all paint systems will fade so it’s important for your customers to understand how warranties can protect their investment. Buying a red roof that prematurely fades to pink is unfortunate enough, but this is made even worse by a warranty that doesn’t adequately protect their purchase.

ABC WARRANTY INFORMATION: PAINT FADING

Why does paint fading matter?

The paint on your customer’s metal roof or wall isn’t just for decoration. In addition to providing color, the paint finish also protects the panels from corrosion, temperature, moisture and other detrimental environmental elements. Fading is the most common source of color change over time and happens when environmental elements deteriorate the paint’s pigment (granular particles that give the paint its color). This deterioration also reduces the paint’s effectiveness in protecting metal panels.

Paint fading is measured by the American Society of Testing Materials’ (ASTM’s) Hunter unit (∆E) standard, which compares the faded color to the original. In accordance with ASTM Standard D2244, one Hunter Unit is equal to the smallest amount of change visible to the naked eye.

What do you need to look for in your warranty?

Selecting a product with a 40-year warranty is a great start, but not all panels, paint systems and warranties are created equal. Your customers should make sure that the manufacturer provides a warranty which clearly defines the number of Hunter units the paint system is allowed to change for both vertical (wall) and horizontal (roof) applications. This is critical when comparing one painted metal roof or wall against another. The lower the number of Hunter Units expressed in the warranty, the better the paint system will resist fading.

ABC’s Premium paint system warranty guarantees paint will not fade in excess of five units in vertical applications and seven units for non-vertical applications over the course of 30 years, with the exception of Radiant Red. ABC’s fading specification on all colors available in our Select40 paint system guarantees protection for the same degree of fade as guaranteed in the Premium system, but for 25 years. Check out ABC’s color resources and warranty information to learn more!

What’s next?

Understanding the film integrity and fading for metal panels is very important, but it doesn’t end there. In the final installment of our “Decoding Your Warranty” blog, we will uncover a third consideration that can help you and your customers understand metal roofing and siding warranties: chalking.