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Fiberglass Roofing Shingles: An Honest Review

September 27th, 2025

4 min read

By Isabelle Braeutigam

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Protecting your home starts with choosing the right roofing material, but with so many options out there, it can be tough to know which one fits your needs best.

At Custom Built Design & Remodeling, we understand that Michiganders want a roof that balances durability, cost, and performance to withstand the state’s unpredictable weather.

That’s why we’ve put together this honest review of fiberglass roofing shingles, breaking down the pros and cons to help you make an informed decision that safeguards your home and fits your budget:

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What Are Fiberglass Roofing Shingles?

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Fiberglass shingles are made by layering fiberglass mats coated with asphalt and topped with mineral granules. This construction makes them lighter and more fire-resistant compared to traditional asphalt shingles, which used to be the standard decades ago.

Fiberglass shingles come in various styles, including three-tab and architectural (dimensional) shingles, giving you flexibility in appearance and budget.

Pros of Fiberglass Roofing Shingles

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1. Durability

Fiberglass mats provide a strong, stable base that resists cracking, splitting, and warping.

This durability allows the shingles to hold up well under Michigan’s harsh weather conditions, such as heavy snow, ice, rain, and temperature swings, without breaking down prematurely.

Why This Is Important:

A durable roof means fewer repairs and replacements over time, protecting your home from leaks and damage while saving money and stress in the long run.

2. Fire Resistance

Fiberglass shingles are typically rated Class A for fire resistance, the highest classification available. This means they can withstand severe exposure to flames and heat without igniting quickly.

Why This Is Important:

Michigan homes can benefit from enhanced safety against fire hazards, especially in areas prone to wildfires or accidental fires. Plus, insurance companies may offer discounts for homes with Class A fire-rated roofing, lowering your ongoing costs.

3. Lightweight

Compared to other roofing materials like slate, tile, or even metal, fiberglass shingles weigh less, which puts less strain on your roof framing and structure.

Why This Is Important:

A lighter roof reduces the risk of structural issues, especially in older homes. It also often means easier and faster installation, potentially lowering labor costs.

4. Cost-Effective

Fiberglass shingles are generally more affordable than premium roofing materials like metal or synthetic composites. This makes them a popular choice if you’re seeking good value.

Why This Is Important:

If you’re Investment-conscious, you can get reliable protection and decent aesthetics without deviating from your goals, allowing funds to be allocated to other home improvements or essentials.

5. Ease of Installation

Fiberglass shingles are manufactured in standardized sizes and are lighter, making them easier for roofing crews to handle and install quickly.

Why This Is Important:

Quicker installation means less disruption for your family and potentially lower labor costs. It also reduces the window of vulnerability where your home might be exposed to the weather during installation.

Cons of Fiberglass Roofing Shingles

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1. Shorter Lifespan

Fiberglass shingles typically last 20 to 30 years, which is less than some alternatives like metal roofing (40+ years) or premium composites.

Why This Is Important:

If you plan to stay in your home long term, you might face a roof replacement sooner than with more durable materials, affecting your overall investment.

2. Granule Loss

The protective mineral granules on fiberglass shingles can wear off over time, especially after severe weather or hailstorms. This leaves the asphalt layer exposed, which accelerates aging.

Why This Is Important:

Granule loss reduces the roof’s ability to reflect sunlight and resist water, potentially leading to leaks and decreased curb appeal. Early detection can save money on bigger repairs.

3. Susceptible to Algae Growth

In Michigan’s humid climate, fiberglass shingles can develop dark streaks or stains from algae growth, which primarily affects the roof’s appearance.

Why This Is Important:

While algae doesn’t usually damage the roof structurally, it can lower your home’s curb appeal and potentially affect resale value. Cleaning or treating shingles may be necessary to maintain appearance.

4. Limited Insulation

Fiberglass shingles do not provide significant insulation, so the energy efficiency of your home depends mostly on attic insulation and ventilation rather than the roofing material itself.

Why This Is Important:

Without additional insulation, your heating and cooling costs could be higher. Proper attic insulation is crucial to keep energy bills down, especially in Michigan’s seasonal climate.

5. Not as Impact-Resistant

Fiberglass shingles can be more vulnerable to damage from hail compared to specialized impact-resistant shingles or metal roofing options.

Why This Is Important:

Michigan experiences occasional hailstorms that can crack or dent shingles, leading to premature wear or leaks. Choosing the right roofing for your area’s weather protects your home and may lower insurance premiums.

How to Decide If Fiberglass Shingles Are Right for You

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Choosing fiberglass shingles depends on your budget, roof requirements, and long-term goals. If you want a durable, affordable roofing option that resists fire and mildew, fiberglass shingles are a solid choice.

Here’s an expanded view of what fiberglass roofing shingles are and aren’t best for:

Best For:

  • Homeowners seeking a cost-effective and reliable roofing option
  • Those looking for good fire resistance and weather durability
  • Michigan homeowners who want a low-maintenance roof that performs well in varied climates
  • Projects with a moderate lifespan expectation (about 20-30 years)
  • Homeowners who prioritize function and value over premium aesthetics

Not Best For:

  • Homeowners wanting a luxury or high-end roofing appearance
  • Those needing an exceptionally long-lasting roof with warranties beyond 30 years
  • Projects requiring heavy customization or unique architectural styles
  • Homeowners who prefer materials with higher impact resistance, like metal or slate
  • Situations where maximum resale value and curb appeal are top priorities

Next Steps to Remodeling or Replacing Your Roof

Choosing the right roofing material is key to protecting your home and investment.

Fiberglass shingles offer a durable, cost-effective option that performs well in Michigan’s climate, though they come with some limitations to consider.

At Custom Built Design & Remodeling, we’re here to guide you through every step of selecting and installing the best roof for your home.

Book a consultation to explore whether fiberglass shingles are the right fit for your roofing project.

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Now that you know more about fiberglass roofing shingles, let’s explore what the first step of the Custom Built Proven Process looks like with your build, a deeper look into common roofing materials, and the best exterior home improvement projects:

Isabelle Braeutigam

Isabelle has worked at Custom Built for over 7 years, learning the systems from all sides. She has become an industry advisor in the customer relations software HubSpot, has a keen talent for elements of design, and currently leads the marketing team under the innovative TAYA system.