Are you considering installing a metal roof, but your home or building has a low slope? Choosing the right metal panel is crucial, as not all roofing systems work efficiently on low slopes. In this guide, we’ll walk you through everything you need to know to make the right choice for your project.
What Is Considered a Low Slope Roof?
A roof is considered a low slope when its pitch is less than 3:12. This means that for every 12 inches the roof extends horizontally, it rises less than 3 inches vertically.
For example:
- A 4:12 pitch means the roof rises 4 inches for every 12 inches of horizontal span.
- A 2:12 pitch means it only rises 2 inches over the same span.
Important: You don’t need to get on your roof to measure the pitch. A local roofing contractor will inspect and inform you of the exact slope during your roof evaluation.
Why Low Slope Roofs Require Special Panels
If you are planning to install a metal roof on a low slope, there is something very important you should know. Low slope roofs don’t have enough pitch, which means rainwater doesn’t drain off quickly and efficiently. So, water stays on the surface for a longer period of time, which increases the risk of leaks in the roof. This makes water damage more likely compared to steeper roofs.
That’s why choosing the right type of metal panel is extremely important. Not all panels are made for low slope roofs. If you pick the wrong one, it may not seal properly, and over time, water can seep in. This can lead to expensive repairs and even complete roof failure. To avoid such problems, your metal roof needs to offer maximum weather tightness. That means it must be tightly sealed so water cannot get through.
Proper installation is just as important as the material itself. Even the best panels can fail if they are not installed correctly. So, always hire experienced professionals who understand how to work with low slope metal roofing. In short, if you’re working with a low slope roof, be extra careful with your choice of metal panels and make sure everything is installed the right way. It’ll save you money, time, and give your home strong protection for many years.
Best Metal Roof Panels for Low Slopes
When it comes to choosing panels for a low slope, two types stand out:
1. Mechanically Seamed Metal Roofing (Concealed Fastener System)
Mechanically seamed panels are the best option for very low slope roofs. These are a type of standing seam metal roof featuring concealed fasteners and interlocking seams that are crimped together using either a mechanical or hand seamer.
This system creates an extremely weather-resistant seal, significantly reducing the risk of leaks.
Key Benefits:
- Ideal for pitches of 1:12 or greater
- Maximum resistance against rain, snow, and harsh weather
- No visible screws or open fasteners
Single Lock vs. Double Lock Systems
Mechanically seamed panels come in two types:
- Single Lock (90° fold): Folded once. Provides good performance.
- Double Lock (180° fold): Folded twice. Offers maximum weather tightness and is more secure.
Our Recommendation: Always choose double lock for best results, especially in regions with extreme weather.
Panel Heights and Slope Compatibility
Mechanically seamed panels are available in different seam heights:
- 2″ Double Lock: Can be used on 1:12 pitch or greater with sealant.
- 1.5″ Double Lock: Can be used on 2:12 pitch or greater with sealant.
2. 7.2 Panel (Exposed Fastener System)
If you are considering exposed fastener panels for a low slope, the 7.2 panel is your best option.
This panel features high ribs (1.5 inches tall), which provide extra weather tightness and strength. While it’s not as leak-resistant as a standing seam system, the high ribs help water flow more effectively.
Key Features:
- Minimum slope requirement: 1:12 to 2:12 (Check with the manufacturer)
- High rib design improves drainage
- More affordable and easier to install than concealed fastener panels
Note: The 7.2 panel has visible fasteners, which are potential water entry points. However, its design still offers the best performance among all exposed fastener panels.
Mechanically Seamed vs. 7.2 Panel – Which Should You Choose?
| Feature | Mechanically Seamed | 7.2 Panel |
|---|---|---|
| Fastener Type | Concealed | Exposed |
| Leak Resistance | Excellent | Moderate |
| Recommended Slope | 1:12 or greater | 1:12 to 2:12 |
| Ease of Installation | Complex | Easier |
| Cost | Higher | More Affordable |
| Best Use Case | Extreme climates, low slopes | Budget projects with moderate slope |
Recommendation: Go with mechanically seamed double lock panels if budget allows. For those needing a budget-friendly solution, 7.2 panels are your best exposed fastener option.
Visualize Your Metal Roof Before You Buy
Want to see what your home will look like with a metal roof? Try the Western States Metal Roofing Online Color Visualizer. It’s a free tool that lets you preview different colors and styles on your home before making a final decision.
Try it at: Sjroofingventing
Final Thoughts
When dealing with a low slope roof, it’s critical to choose the right metal panel to ensure durability and prevent leaks. Whether you go with the mechanically seamed double lock panel for top performance or the 7.2 panel for affordability, understanding your roof’s slope and climate needs will help you make the right decision.
Don’t forget to subscribe to the Western States Metal Roofing YouTube channel for more metal roofing guides and tips released every week!
Hello! I’m Abdullah, a passionate professional in the field of construction and roofing. I am the proud owner of SJ Roofing & Venting, a leading construction company based in New York. With years of hands-on experience, I write about various construction methods, techniques, and industry insights to share my knowledge and help others in the field. I’m also the founder and main contributor of this website.
