❓ What is Metal Gauge in Roofing? – How to Choose the Right Thickness (Tap to Expand)
Metal gauge measures the thickness of steel panels used for roofing, siding, and agricultural buildings. The lower the gauge number, the thicker and stronger the panel. Selecting the correct gauge depends on your climate, wind or snow load requirements, and whether panels are for roofing, siding, or decorative use.
General rule of thumb: - Thin gauges (31–29) work best for decorative or temporary projects. - Mid-range gauges (28–26) are ideal for residential and light commercial buildings. - Heavy-duty gauges (24–20) are recommended for high winds, heavy snow, or long-term commercial use.
31 Gauge Metal Panels – Are They Worth It? (Tap to Expand)
31-gauge panels are the thinnest steel commonly sold at big-box stores. They are inexpensive and easy to cut, making them popular for DIY projects.
- Best for patio covers, decorative siding, and temporary sheds
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Not designed for areas with heavy rain, wind, or snow
- Prone to denting, warping, and faster corrosion
Pacific Northwest Recommendation: Avoid 31 gauge for outdoor roofing or siding in the PNW due to consistent rainfall and coastal humidity, which accelerate corrosion.
29 Gauge Metal Roofing – The Standard for Residential and Agricultural Use (Tap to Expand)
29 gauge is the most common choice for residential metal roofing and siding. It balances affordability, strength, and ease of installation.
- Ideal for barns, sheds, fencing, and standard home roofs
- Performs well in moderate wind and snow conditions
- Available with galvanized or aluminum-zinc coatings for rust protection
Pacific Northwest Recommendation: 29 gauge is suitable for most PNW residential applications. Choose aluminum-zinc coated panels to resist constant moisture and prevent moss growth in rainy regions.
28 & 26 Gauge Steel Panels – A Better Option for Harsh Climates (Tap to Expand)
28 and 26 gauge panels are thicker and stronger than 29 gauge. They are commonly used for high-end residential roofing, light commercial buildings, and large pole barns.
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28 Gauge: High-end residential siding and roofing
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26 Gauge: Agricultural and light commercial buildings
- Better resistance to dents, high winds, and heavy snow
Pacific Northwest Recommendation: 26 gauge is ideal for coastal PNW areas or regions east of the Cascades where heavier snow or wind is common.
24 Gauge Metal Roofing – Why Contractors Recommend It (Tap to Expand)
24-gauge steel panels are the industry standard for standing seam roofs and commercial buildings. They provide a long lifespan and superior dent resistance.
- Handles severe weather, hail, and heavy snow
- Recommended for premium homes, shops, and warehouses
- Reduces long-term maintenance and replacement costs
Pacific Northwest Recommendation: The best choice for mountain or high-snow areas like the Cascades or eastern Washington. Also excellent for coastal homes exposed to salt air and strong storms.
22 & 20 Gauge Industrial Steel Panels – When Maximum Strength is Required (Tap to Expand)
22 and 20 gauge panels are structural-grade steel used in industrial, agricultural, and load-bearing applications. They are not typically used for standard residential roofing due to cost and weight.
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22 Gauge: Heavy-duty agricultural and warehouse buildings
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20 Gauge: Industrial structures, bridges, and decking
- Requires professional installation
Pacific Northwest Recommendation: Overkill for residential projects. Used mainly for commercial or industrial buildings needing structural support.
📏 Quick Reference – Which Metal Gauge Works Best in the Pacific Northwest? (Tap to Expand)
| Gauge |
PNW Best Use |
Durability |
| 31 |
Avoid for PNW roofs; only decorative use |
Low |
| 29 |
Most PNW homes & barns; choose aluminum-zinc coated |
Medium |
| 28 |
Premium homes in rainy coastal areas |
Medium-High |
| 26 |
Coastal, wind-prone, or eastern WA snow zones |
High |
| 24 |
Cascades, mountain cabins, or coastal storm areas |
Very High |
| 22–20 |
Commercial & industrial PNW buildings |
Extreme |
