When it comes to updating your home’s roof, many Troy, MI homeowners face a key decision: should you invest in a full new roof or opt for a re-roof? While the terms are often used interchangeably, they represent two very different processes with distinct implications for cost, longevity, and structural integrity.
At
180 Contractors Roofing & Siding, we help homeowners make informed choices by breaking down the key differences between these two roofing solutions. Here’s what you need to know before climbing onto your next roofing project.
What Is a New Roof?
A new roof—also called a full roof replacement—involves removing all existing roofing materials down to the deck. This allows the contractor to inspect and repair underlying structures such as decking, underlayment, and flashing before installing new shingles or roofing materials.
Benefits of a New Roof:
- Full inspection of structural integrity
- Ability to replace damaged decking
- New underlayment and ventilation improvements
- Extended warranty protection from manufacturers like Owens Corning
- Increased home value and better long-term performance
In Troy, where homes face temperature extremes and harsh weather, full replacements are often the safer, more durable solution.
What Is a Re-Roof?
Re-roofing, also known as a roof overlay, skips the removal process and involves placing new shingles directly over an existing layer (only if there’s one existing layer). It’s faster and less expensive upfront but comes with notable limitations.
Benefits of a Re-Roof:
- Lower upfront cost
- Quicker installation time
- Minimal disruption to the home during construction
Downsides of a Re-Roof:
- No opportunity to inspect or repair underlying issues
- Added weight can strain your roof structure
- New shingles may not lay flat or seal properly
- Shorter lifespan and may void warranties
Troy’s fluctuating climate—including ice dams, summer storms, and high humidity—makes re-roofing a risky bet without a thorough structural evaluation.
Code Considerations and Layer Limits
In many municipalities, including those in Oakland County, building codes prohibit more than two layers of roofing. If your home already has two layers, re-roofing is no longer an option—you must opt for a full replacement.
Even if you only have one layer, our experts at 180 Contractors Roofing & Siding often advise against overlays unless the existing roof is in near-perfect condition—something rarely found in older homes.
Which Is Right for Your Home?
Choose a New Roof If:
- Your roof is more than 15–20 years old
- You’ve experienced recurring leaks or water damage
- You want long-term performance and durability
- You plan to sell your home and want to increase its value
Consider a Re-Roof If:
- Your roof has only one layer
- There’s no structural damage or soft spots
- You need a temporary fix due to budget constraints
However, even when budget is a concern, it’s important to weigh the cost savings of a re-roof against the potential for expensive repairs later.
Why We Recommend Full Replacements
At 180 Contractors Roofing & Siding, we prioritize your home’s protection. That’s why we prefer full roof replacements that include thorough inspections, complete tear-offs, and installation of superior materials such as Owens Corning shingles.
A new roof ensures better ventilation, energy efficiency, and peace of mind—especially in a city like Troy, MI, where weather can turn in an instant.
Let Us Guide You to the Right Decision
Whether you’re leaning toward a new roof or considering a re-roof, we’ll give you honest advice based on a detailed inspection. Our goal is to ensure your roof investment pays off in both the short and long term.
Read also our blog:
Why Multiple Layers of Shingles Are a Bad Idea
