Frequent question: What class is a standing seam metal roof?

Since metal roofing is designated with a Class A fire rating, it is one of the most non-combustible roofing materials with the greatest strength to stand up to fires.

Is a metal roof a class 4 roof?

Many metal roofs are impact resistant and will be rated Class four. … Class 4 ratings in alternative metals such as aluminum and copper are also available (though much less frequent).

What are the classes of roofs?

Roof covering fire ratings are Class A, B, C, or unrated; with Class A providing the best performance. Common Class A roof coverings include asphalt fiberglass composition shingles, concrete and flat/barrel-shaped tiles.

What is a roof UL classification?

Prepared roof covering materials such as asphalt shingles, are UL-listed. Most roofing materials and roof systems bear the UL classification mark, which is the manufacturer’s representation that samples of that product have been evaluated for specific properties or suitability for use under specific conditions.

What type of metal are metal roofs?

Five of the most common materials used in metal roofing are Galvalume®, aluminum, zinc, copper, and stainless steel.

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What gauge is a Class 4 metal roof?

A Class 4 rating is the highest tested rating for impact resistance under the UL 2218 standard for metal roofing panels. This certification indicates the roof material has passed testing that simulates withstanding 2” diameter hail with no visible defect. Our 26 gauge panels (and thicker) pass this testing.

What is a Class 3 or 4 roof?

Summarizing the result we would be looking at for, a Class 3 roof is earned if the sample does not crack when hit twice in the same spot by a 1.75 inch diameter steel ball. A Class 4 rating, the material should not get damaged when hit twice in the same spot by 2 inch diameter steel ball.

What is a Class 1 roof?

A Class 1 roof has undergone a series of tests that evaluate the entire roof assembly, including the external spread of flame test utilized for the Class A rating. All Class 1 roof assemblies are Class A roofs, but not all Class A roof systems meet the Class 1 rating.

What is a Class 2 roof?

A Class 2 impact shingle is one that has been assigned a Class 2 rating by Underwriters Laboratory, or UL. … A shingle is assigned a Class 2 rating if it does not rupture or crack when hit by 1.25-inch balls dropped from 20 feet above. The highest rating is Class 4.

What does a Class A roof mean?

Class A is the highest rating, offering the highest resistance to fire, and unrated is the worst. Examples of a Class A roof covering include concrete or clay roof tiles, fiberglass asphalt composition shingles and metal roofs. … A burning ‘Class A’ brand on a fiber cement roof covering during the fire test.

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What is the difference between Class A and Class C roofing?

This standard includes three classes of fire exposure: • Class A roof coverings, which are effective against severe fire test exposures • Class B roof coverings, which are effective against moderate fire test exposures • Class C roof coverings, which are effective against light fire test exposures.

What are Class 4 shingles?

Shingles that are “impact resistant” are considered a class 4 product, and are designed to withstand high winds and hail damage. These shingles may be made of copper, aluminum, resin and plastic. Shingles with the Class 4 rating have an impact resistance rating of UL 2218.

What is a UL Class A fire rating?

Class A designates resistance to relatively severe fire-test exposure; Class B designates resistance to relatively moderate fire-test exposure; and Class C designates resistance to relatively light fire-test exposure.

What are the disadvantages of a metal roof?

Disadvantages of metal roofs

  • Affordability. Metal roofs can be as much as two or three times more expensive than other roofing materials. …
  • Noisiness. …
  • Expansion, contraction and fasteners. …
  • Inconsistency of color match. …
  • Performance.

What are the problems with metal roofs?

In this post, we’ll cover four of the most common problems with metal roofing, and how to fix or avoid them.

  • Leaks. One of the most familiar problems with metal roofing (or any roofing, for that matter) is leaking. …
  • Oil Canning or Stress Wrinkling. …
  • Corrosion. …
  • Your Roof Looks Scratched.


What is the best color for a metal roof?

Compared to dark colors, light colors such as white, light bronze, beige and peach are better at reflecting the sun’s heat rather than absorbing it into the building. These light colors are often referred to as cool metal roofing colors.

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Roofs and roofing