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Can You Install a New Roof Over Existing Shingles?

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The short answer is: sometimes—but not always. While installing a new roof over old shingles (often called a roof overlay) can reduce upfront costs, it’s not always allowed by code or recommended for South Jersey homes.

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Here’s what homeowners in the Cherry Hill area should know before choosing this option.

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What Does It Mean to Install a Roof Over Existing Shingles?

Roofing over means installing a new layer of asphalt shingles directly on top of the existing roof without tearing off the old shingles first.

This method skips the tear-off process, which can save time and money. However, it also limits what your roofer can inspect underneath the surface—something that matters when deciding between repair and replacement.

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Is Roofing Over Allowed in Cherry Hill and Camden County?

In most parts of Camden County, building codes allow a maximum of two layers of asphalt shingles. This means roofing over may be permitted only if:

• Your home has one existing layer of shingles

• The roof decking is solid with no rot or sagging

• Existing shingles are flat and securely attached

• There are no active leaks or moisture issues

• The installation meets local inspection requirements

 

If your home already has two layers of shingles, a full tear-off is required by code.

A local contractor experienced with asphalt shingle roof installations can determine whether your roof qualifies for an overlay or if a full replacement is the better option.

You can learn more about proper installation standards here.

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When Roofing Over Is NOT a Good Idea

Because homes in South Jersey experience heavy rain, strong winds, snow, and summer heat, roofing over existing shingles is not recommended if:

• Shingles are curling, cracked, or severely worn

• There are leaks or interior ceiling stains

• The roof deck has soft spots or signs of rot

• Flashing around chimneys or vents needs replacement

• Ventilation issues need to be corrected

• You want the longest possible lifespan from your new roof

 

In many of these cases, targeted roof repairs or a full replacement may be necessary before new shingles are installed.
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Pros of Installing a Second Layer of Shingles

Some Cherry Hill homeowners consider this option because it offers:

• Lower upfront cost

• Faster installation time

• Less debris and cleanup

• Less disruption to daily life

 

In limited situations where the roof is still in good shape, roofing over can serve as a short-term solution, though it rarely delivers the best long-term value.

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Cons of Roofing Over an Existing Roof

There are important downsides homeowners should consider:

• Shorter lifespan compared to a full replacement

• Hidden damage cannot be properly inspected or repaired

• Added weight on the roof structure

• Reduced ability to detect future leaks

• Possible manufacturer warranty limitations

• Less clean, uniform appearance

 

For most homes in Camden County, a roof overlay will not last as long as a complete tear-off replacement.

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Is a Full Tear-Off Better for Cherry Hill Homes?

In most cases, yes.

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A full tear-off allows your roofing contractor to inspect the roof deck, replace damaged wood, and install new underlayment and flashing. It also ensures your new shingles are installed correctly for New Jersey’s climate.

Homeowners who want long-term protection typically benefit from a professionally installed shingle roof by an experienced local company like JV Roofing & Exteriors.
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Does Roofing Over Affect Insurance or Home Value in NJ?

It can.

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• Some insurance companies prefer or require full tear-offs

• Home inspectors often flag layered roofs during resale

• Buyers may view overlays as a shortcut rather than a permanent fix

 

If you plan to sell your home in Cherry Hill, NJ or anywhere in Camden County, a full roof replacement is usually the stronger investment.

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How Do You Know What’s Right for Your Roof?

The best way to know whether roofing over is allowed—or smart—is to schedule a professional roof inspection with a local Cherry Hill roofing contractor.

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You can quickly book an online roofing appointment to have your roof evaluated by a professional who understands local codes and conditions.

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If you have questions or want to discuss your options first, you can also reach out directly.
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Final Thoughts

Yes, you can sometimes install a new roof over existing shingles in Cherry Hill, NJ, but it’s not always the safest or smartest choice. While it may save money upfront, it often sacrifices longevity and peace of mind.

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For most homeowners in Camden County, a full tear-off roof replacement provides better protection and a roof that’s built to last.

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