Questions You Should Know about Farm Roofing Panels

31 Mar.,2025

 

Considerations for Agricultural Metal Roofs | Mid Michigan Metal Sales

There are numerous settings and scenarios where metal roofs are often utilized to great benefit on various structures, and the agricultural realm is a great example here. Metal roofs are quite common in various agricultural facilities and related structures, whether for machinery and related needs or things like workshops, storage, rural businesses and many more.

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At Mid Michigan Metal Sales, we’re here to offer a wide range of metal roofing panels, metal shingles, metal siding and related products for clients around Michigan, including for agricultural needs of various types. While your precise list of considerations here will naturally vary based on individual factors, here are some broad topics to be keeping in mind if you’re involved in sourcing or building a metal roof in any agricultural setting.

Why Metal Roofs for Agriculture?

Before we dig further into specific benefits, it’s worth addressing a basic question: Why are metal roofs so commonly utilized in agriculture? There are several reasons:

  • Durability and resistance to various weather elements
  • Versatility for many different structures and needs
  • Ease of installation compared to many other roofing types
  • Cost-effectiveness over the life of the roof

Common Agricultural Building Types

There are numerous building types within the agricultural realm that commonly use metal roofs, including:

  • Barns and stables
  • Sheds and storage buildings
  • Greenhouses or related structures
  • Processing facilities
  • Livestock housing and enclosures

In many cases, different areas of the same farm will have different roofing needs. For example, a barn may require a slightly different type of metal roof than a livestock enclosure, and both may be different from the roofing needs in a processing facility.

Post-Frame or Stick-Frame Construction?

Generally speaking, there are two broad construction formats that might be used for agricultural buildings: post-frame and stick-frame construction. Stick-frame is a more traditional type of construction that involves building from the ground up, using wood framing and other elements to make a solid structure.

On the other hand, post-frame construction refers to utilizing large posts or columns as structural support instead of relying on traditional load-bearing walls. This method often allows for faster and more cost-effective construction, making it a popular choice for agricultural buildings.

For this reason, post-frame construction is typically the preferred method when it comes to metal roofing for agricultural structures. It also allows for more flexibility in terms of design and layout, making it easier to customize your roof to fit your specific needs.

Substrate Material

Another key consideration when it comes to metal roofs in agriculture is the substrate material used. The most common options here are galvanized substances or Galvalume, which is a combination of zinc and aluminum.

While galvanized steel is typically the more affordable option, Galvalume offers superior corrosion resistance and durability. For agricultural structures where exposure to harsh weather elements or chemicals is a concern, investing in higher-quality substrate material might be worth considering.

Paint System

There are several paint systems that can be used for metal roofs in agriculture, including polyester, silicone-modified polyester (SMP) and polyvinylidene fluoride (PVDF). Polyester and SMP systems have been around the longest and remain the most common, but PVDF offers superior durability and resistance to fading.

If possible, it’s generally worth considering a PVDF paint system for your metal roof in an agricultural setting, especially if you’re concerned about appearance or longevity.

Metal Gauge

When we talk about steel gauge, we’re referring to the thickness of the metal used in your roof. The lower the gauge number, the thicker and more durable the metal will be.

In agriculture, where roofs are subject to a variety of weather conditions and potential damage from equipment or animals, it’s generally recommended to opt for a lower gauge metal. This may come at a slightly higher upfront cost, but can save you money in the long run by reducing the need for frequent repairs or replacements.

Accessories

Depending on your specific needs, there are many accessories that can be added to a metal roof in an agricultural setting. These may include:

  • Skylights or windows for additional natural light
  • Insulation for temperature control and energy efficiency
  • Gutters and downspouts for proper drainage
  • Ventilation systems for airflow and moisture control

Before making any final decisions on your metal roof, be sure to consider which accessories may benefit your specific structure and needs.

Agricultural - Metal Roofing and Siding Blog

If you’ve ever driven through a rural area, you’ve likely noticed various agricultural machine sheds with metal roofs. While their beginnings have humble roots, today's agricultural metal building uses range from the traditional purpose of machinery storage to more extravagant uses such as wineries, workshops, daycare, and mini-storage facilities. 

Applications of agricultural metal roofing are limitless.

Are you interested in learning more about Farm Roofing Panels? Contact us today to secure an expert consultation!

Let’s explore basic construction methods, critical buying criteria, and a few frequently asked questions to better understand this market segment.

Post-Frame Construction

Most agricultural metal structures (also called pole barns) use a post-frame construction method. Post-frame construction is different than traditional stick-frame construction because post-frame construction relies on large posts and trusses to transfer the structural load into the ground rather than wood studs and trusses.

In stick-built construction, studs and trusses are located every 16” to 24” on center for structural support. Conversely, post frame buildings are constructed 8’ on center with roof trusses secured to foundational posts. This difference allows for the creation of vast, open interior spaces.

Next, let’s take a look at a few things to consider before making your final product selections.

Critical Buying Criteria

Before purchasing metal roofing products, consider the substrate, panel thickness, and paint system.

Substrate. A substrate is the base material in metal roofing and siding. Galvanized and Galvalume are the two basic types. Galvanized substrates are coated with zinc alloy, while the coating on GalvalumeⓇ substrates is zinc plus aluminum. Building use is a significant factor when choosing between the two substrate types.

Galvanized substrates offer better performance in animal confinement situations, and Galvalume is typically the preferred substrate for all other applications. If you’d like to talk about the use of your specific building, contact us.  We’re happy to help you determine which might be the best substrate for you.

When considering a galvanized substrate, it’s essential to understand the different thicknesses available for the zinc coating. For example, G60 has .60 ounces of zinc per square foot, while G100 products offer 1.0 ounces per square foot. 

While that difference may seem minimal, the difference in expected performance is substantial and directly impacts how long you can expect the panel to last. To learn more about substrate options and performance, check this out. 

Steel Gauge.  Gauge is how metal panel thickness is measured. The gauge of steel panels affects how far the panels can safely span between supports how they react to forces like high winds, hail, and even snow.  

Steel gauge equivalents work in reverse order, so a higher number represents a lighter steel thickness. Standard metal panel gauges span from 29 gauge to 18 gauge, with 29 Gauge being the most common thickness for agricultural metal roofing applications. 26 gauge steel is also common for these project types based on geographic location and other building-specific parameters.  

Paint System. Much like a three-legged stool doesn’t work with only two legs, the paint system on agricultural metal roofing is the third critical component. Commonly available paint systems include Silicone, Silicone Modified Polyester (SMP), and Polyvinylidene Floride (PVDF). They represent a good, better, best option, as shown in the graphic below.

SMP paint systems have long been the workhorse for post-frame applications and consequently the paint system that most panel manufacturers offer. While McElroy Metal offers Silicone Modified Polyester (SMP) paint systems, we’re also proud to be one of the few manufacturers to offer PVDF (Kynar 500) paint as a standard on our post-frame metal roofing and siding products.  

PVDF systems offer unparalleled performance against fade and chalk.  The image below provides a great example of why that might matter to you. In the photo, PVDF (Kynar 500) and Silicone-Modified Polyester (SMP) panels were installed on this home in Louisiana.

On day one, the colors were an identical shade of green. This photo, taken only eight years later, tells a powerful story of the differences between the paint systems as it highlights both chalk and fade of the SMP paint system.

There is no visible fade or chalking on the darker (PVDF) panels. To learn more about PVDF, check this out.

Do you have questions about metal roofing? Check out our Metal Roofing FAQ.

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