The right roof shingles are your home’s first line of defense against the elements. Whether you are replacing shingles or building a roof from scratch, selecting the right shingle class can affect your home’s safety, durability, and long-term value. At Nu-Worx, we created a guide to help you understand shingle classes, their purpose, and which class works best for you.
What are the types of classes for roof shingles?
Roof shingles are classified by their resistance to wind, fire, and impact damage. These ratings help determine the best materials for your environment. Three-tab and laminated (architectural) shingles are the most common in the U.S. Laminated shingles are thicker, meet higher class ratings, and last longer.
The three most common classes are:
- Impact Resistance Classes: Rated from 1 (lowest) to 4 (highest), with higher numbers meaning greater resistance to impacts such as hail.
- Wind Resistance Classes: Rated from A to H, where classes further along the alphabet stand for increased wind resistance.
- Fire Resistance Classes: Rated A, B, or C. Class A offers the most fire resistance, Class B is moderate, and Class C is the minimum required.
What are the differences between classes?
These classes—Wind Resistance, Fire Ratings, and Impact Ratings—help determine the suitability of shingles for different hazards.
Wind Resistance
Wind resistance classes measure how well shingles withstand strong winds. Tests simulate wind speeds from 90 mph to over 130 mph. Most importantly, higher classes show greater resistance to wind uplift. Premium shingles are designed to withstand hurricane-force winds, offering enhanced protection.
Fire Ratings
Class A is the top choice for residential shingles because it offers the highest fire resistance and can withstand severe fires. Class B provides moderate fire protection, while Class C meets only the minimum fire-resistance requirements.
Impact Ratings
Class 1 is the lowest, and classes 1-3 offer varying levels of resistance. Class 4 has the highest rating for protection against debris and hail and is ideal in areas with frequent heavy storms.
What are the types of shingle class rating standards?
Shingles are tested to meet the standards of ASTM (American Society for Testing and Materials) and UL (Underwriters Laboratories).
Wind Resistance Shingle Testing Standards
The test for wind resistance, one of the most common, is called “ASTM D3161”. In this test, the shingles are tested at wind speeds of 60, 90, and even 110mph. A different essential test is “ASTM D7158”. Furthermore, this test is rated for resistance up to 150 mph.
Here is a chart used to classify each shingle.
Fire Resistance Shingle Testing Standards
The fire resistance test follows ASTM E108 or UL 790 standards. The test exposes shingles to flame spread, intermittent flames, and burning brands. Based on the results of testing, the shingles are labeled Class A, B, or C. Moreover, Class A offers the highest protection and is best for residential roofs. Class B provides moderate protection, and Class C provides basic resistance.
Impact Resistance Shingle Testing Standards
In the UL 2218 test, steel balls drop from different heights to mimic a hailstorm. This test measures impact resistance, with Class 4 being the highest level of protection. Class 4 provides the most resistance to cracking and splitting after impact.
How can you choose the best shingles for your roof?
Depending on your budget, location, and long-term goals, finding the best shingles can be challenging. Here at Nu-Worx, we want to share some tips to help you choose your roof shingles:
- Consider your long-term budget: Higher-rated shingles last longer and require fewer repairs, which saves you and your company money over time.
- Keep in mind fire safety: If your area is in a wildfire-prone region, Class A fire-rated shingles are essential.
- How is the climate around you? If you are in an area with strong winds and/or hail, consider installing Class 4 impact-resistant roofing shingles.
- Consult local experts: Professional roofing companies can evaluate your roof and recommend the shingle class best suited to your requirements.
Choose shingles designed to withstand your home and your local weather. Finally, from impact-resistant options to longer-lasting architectural shingles, selecting the right shingle class can make a big difference in durability, protection, and long-term value.
Ready to choose the right shingles for your roof? Call us today for expert guidance and secure your home’s protection for years to come.