How Long Do Asphalt Shingles Last? Here’s What to Know

Asphalt shingles are a popular roofing material known for their affordability, versatility, and ease of installation. But how long do asphalt shingles last? The average life span is around 20 years, but there are some factors that can bring that number up or down. From climate conditions and installation quality to maintenance practices and material, we’ll cover everything you need to know about asphalt shingle life span in this guide.

How Long Do Asphalt Shingles Last?

The life span of asphalt shingles is anywhere from 15 to 30 years. However, some premium materials may last longer. For example, when comparing asphalt versus fiberglass shingles, fiberglass can last upward of 50 years, but the material does come with a higher cost. Conducting regular evaluations and maintenance procedures can lengthen the life span of asphalt shingles, enhancing their resilience and performance over time.

Factors Influencing How Long Asphalt Shingles Last

There are a few things that can affect the durability and performance of asphalt shingles, ultimately having an impact on life span.

Climate

Climate is often the most significant factor when it comes to asphalt roof life span. In regions with extreme weather conditions such as heavy rainfall, snow, hail, or high winds, asphalt shingles see increased stress and wear. This stress can potentially lead to premature deterioration.

Intense sunlight and UV exposure in hot climates can also cause the asphalt to degrade. When asphalt degrades, it can crack, blister, and lose granules, which compromises the shingles' integrity and shortens its life span.

In colder climates, freeze-thaw cycles can exacerbate the expansion and contraction of shingles, which also leads to cracking and breakage. Humid locations can cause moisture retention and foster the growth of algae, moss, or mold, which can accelerate the decay of the shingles, as well.

Maintenance

The life span of asphalt shingles is affected by the maintenance you carry out. Regular inspections allow homeowners to identify and repair damaged or missing shingles, preventing small issues from turning into major ones that require replacement. Cleaning gutters and addressing issues such as poor ventilation or flashing damage can help regulate temperature and moisture levels, mitigating the risk of mold growth and preserving the shingle's integrity. 

Installation Quality

Proper installation techniques when applying asphalt shingles ensure the structural integrity and performance of the entire roofing system. Proper nail placement, shingle overhang in accordance with building codes, and using compatible materials, like the proper underlayment for asphalt shingles and flashing based on your roof type and climate, are crucial aspects of the installation that can prevent issues like shingle uplift or water infiltration, prolonging shingle life span.

Quality of Materials

The lifespan and performance of asphalt shingles depend greatly on the quality of materials. There are four shingle grades, each of which has a different average life span.

It’s worth noting that performance shingles, which are typically designed to withstand intense wind and impact, may have a longer life span in areas that don’t see extreme weather.

Ventilation

Proper ventilation regulates temperature and moisture levels in the attic space beneath the roof to aid in the longevity of the asphalt shingles. Adequate ventilation helps prevent the buildup of heat, which can cause the asphalt to soften and degrade over time and lead to premature aging and deterioration. Excessive moisture accumulation in poorly ventilated attics can foster the growth of mold, mildew, and rot, compromising the structural integrity of the roof deck and accelerating the decay of the shingles above.

Roof Pitch

The pitch of a roof, which refers to its steepness or slope, can affect shingle life span. A steeper roof pitch allows for more efficient water drainage, reducing the likelihood of pooling water and moisture infiltration beneath the shingles. This helps prevent water-related damage such as rot, mold, and deterioration of the shingle material, thus extending its life span. A steep roof pitch also promotes better air circulation beneath the shingles, reducing heat buildup and mold growth that can age shingles.

Color

Color can affect the material over time due to the way different colors interact with sunlight and heat absorption. Light-colored shingles, such as white or light gray, reflect more sunlight and heat compared to darker colors, like black or dark brown, which absorb more heat. Darker shingles that absorb more heat may experience higher temperatures and a higher level of UV radiation absorption, leading to accelerated degradation of the asphalt material.

Trees

Tree branches touching your roof can shorten the longevity of asphalt shingles. Overhanging branches, especially during windy conditions or storms, can pose a risk of physical damage, and they can also hold moisture against your roof, increasing the risk of mold and leaks.

The shade provided by trees can inhibit sunlight exposure to certain areas of the roof. This further supports the growth of moss and algae, which can compromise the integrity of the shingles over time.

Signs It's Time to Replace Asphalt Shingles

If you're wondering if it's time to replace asphalt shingles, there are some signs you can check for to see if it's required.

• Visible damage: Cracked, curled, or missing shingles are clear indicators of wear and tear. They compromise the effectiveness of the roof in protecting the structure.

• Granule loss: Excessive granule loss, which may be visible in gutters or on the ground near downspouts, suggests the shingles are nearing the end of their life span.

• Bald spots: Areas where granules have worn away entirely will leave the asphalt substrate exposed. Once exposed, it is vulnerable to damage from UV rays and weather.

• Leaks: Water stains on interior ceilings or walls or evidence of moisture in the attic suggest that the shingles are failing to provide adequate protection.

• Sagging roof deck: A sagging or uneven roof surface may indicate structural issues caused by water damage or deteriorating shingles.

• Age: If the roof is close to or beyond the 15- to 30-year life span, consider a replacement to avoid potential problems associated with aging shingles.

• High energy bills: Poorly functioning shingles can compromise the insulation and ventilation of the attic space, leading to increased energy costs as the HVAC system works harder to maintain comfortable indoor temperatures.

• Moss or algae growth: Excessive moss, algae, or fungal growth on the shingles can indicate moisture retention and deteriorating material.

How to Maintain Asphalt Shingles

To ensure the longevity of asphalt shingles, conduct regular inspections. You can hire a roofer or a roof inspection company to get the job done. Make sure you schedule an inspection at least once a year to identify and address issues before they escalate.

There are also some tasks homeowners can perform on their own to extend asphalt shingle life span:

• Trim overhanging branches that touch your roof or provide excessive shade

• Clean your gutters at least once a year to avoid clogs and spillover onto or near the roof

• Ensure proper ventilation in the attic space to regulate temperature and moisture levels

Troubleshooting Tips for Asphalt Shingles

If you’re experiencing interior leaks or are noticing other signs of asphalt shingle issues, use the following tips to assess the situation and avoid worsening problems.

• Inspect your roof and gutters. Check areas of your roof for damage above any spots where water appears to be leaking into your home. Even a brief spot-check from a ladder can help identify issues before they escalate.

• Replace damaged shingles. If you notice any worn or curling shingles or bald spots on the surface, have a local roofing company carry out a repair before the problem gets worse.

• Inspect your attic. Check your attic once a year for wet or sagging insulation, water spots, pest infestation, and mold growth to identify potential roof leaks.

• Check fasteners. If you’re comfortable getting up on your roof and have the proper safety equipment, scan the surface to look for visible nails or nail heads popping up through the shingles.

• Apply sealant as needed. If you find any exposed nails or gaps between materials during your DIY roof inspection, use roofing sealant as a temporary solution until you can get a professional out for a permanent repair.

• Avoid walking on your roof. Walking on your roof is not only dangerous but it can also accelerate the loss of shingle grit that can contribute to roof leaks. 

Warranties for Asphalt Shingles

Warranties for asphalt shingles vary depending on the manufacturer and product, but they often cover defects in materials and workmanship for a specified period, ranging from 10 to 30 years. Some products may include 50-year warranties or even lifetime warranties, provided you have a professional install the materials.

These warranties may also offer prorated coverage beyond the initial period, with some manufacturers providing full replacement value within a certain timeframe and decreasing coverage as the shingles age.

Additionally, warranties may include provisions for wind and algae resistance, and other specific performance guarantees. Homeowners should carefully review the terms and conditions of the warranty, including any requirements for installation, maintenance, and documentation, to ensure compliance and eligibility for coverage in the event of a claim.

Replacing vs. Repairing Asphalt Shingles

Repairing a shingle roof costs an average of $950, while replacing costs around $10,500, so repairs will almost always be more affordable.

However, the choice to repair or replace asphalt shingles requires considering the extent of damage, the age of the roof, and the overall cost-effectiveness. Minor damage, such as a few missing or damaged shingles, are often best to repair, especially if your roof has five or more years of life left in it. However, if the damage is widespread, if the shingles are nearing the end of their life span, or if there are underlying structural issues, replacing the entire roof is often a more affordable option in the long run, despite costing more up front.