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Choosing a hail resistant roof

When choosing a roof to stand up against hail storms, a few key factors should be accounted for. The first is the thickness, or gauge, of the panel. The second is the tensile strength, defining how malleable or brittle the metal itself may be. The last factor is the method by which the panel bonds to its neighboring panels. To have a truly hail resistant metal panel, a design must combine all of these factors to create a layer of protection.

Thicker Steel Protects Better

When it comes to protecting a roof, the thickness of the metal is a key factor to resisting large-sized hail stones. Bridger Steel recommends a minimum of a 26 gauge steel roofing panel to survive a harsh hail storm. A thicker metal panel will resist punctures and form stronger seams between panels.

Tensile Strength

When choosing the right roof to protect against a hail storm it is important to understand your options regarding tensile strength. A higher tensile strength will hold up better to dents and surface damage, but has a higher likelihood of puncturing in the case of massive hail stones. A lower tensile strength will deform and stretch under the largest hail stones, rather than breaking. In more common small to medium sized hail, a lower tensile strength will still deform. Bridger Steel recommends using a higher tensile strength metal, combined with a strong panel that is unlikely to puncture or tear.

Standing Seam vs. Corrugated

The last factor in determining a good choice for a hail resistant roof is choosing the type of metal panel itself. In most cases a corrugated panel is the best option for pure protection. The corrugation helps deflect and hide any deformities that may occur. Bridger Steel recommends our 7/8" Structural Corrugated Panel if this is your chosen option. This is our strongest panel, and alongside obtaining a UL 2218 impact rating, it is also our highest rated panel against wind uplifts (up to 260 mph).

For those interested in a standing seam panel, we would recommend the 2" Structural Mechanical Lock with Striations, double-seamed for added protection. The double-seamed rib will provide the best possible protection from a seamed product. The Striations will help give the panel additional rigidity, and hides smaller imperfections better than a flat design.

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Product Details
UL Impact Ratings

The UL 2218 Impact Rating is a testing process in which a panel is subjected to a impact that simulates a hailstone.  This simulation is achieved by taking a 1.25-2 inch steel ball and dropping it from a height of 12 feet above the panel.  

A Class 4 rating means the panel did not crack when struck twice in the same location by the 2 inch steel ball.  This is the highest rating available for a metal roofing panel. 

 

7/8" Corrugated Roofing

Our 7/8" Corrugated Roofing Panel is our highest UL rated panel, earning a Class 4 rating.  The large corrugations in the panel also work best at hiding small imperfections, making them ideal for regions with large hailstones.

Learn more about the 7/8" Corrugated Roofing panel

2" Mechanically Seamed

If you are looking for a structural, heavy duty standing seam panel, our 2" Structural Mechanical Lock has a Class 4 UL rating.  In hail-prone regions we recommend using this panel in the striated variation to help with structural rigidity and hide small imperfections created from large hailstones.

View the 2" Mechanical Lock Roofing panel

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