When it’s time for a new roof, many homeowners look for ways to reduce costs. One common option that gets mentioned is adding a “second layer” of shingles over the old roof instead of tearing the original one off.
While this may seem like a quick, cheaper solution, it usually creates far more problems than it solves.
At Pro Exteriors, we almost never recommend a second layer of shingles — and here’s why.
A second layer adds serious weight to your home
Roofing materials are heavy. A single layer of shingles already puts significant weight on your home’s structure. Adding a second layer can add thousands of extra pounds to your roof system.
This can lead to:
- Structural strain on your home
- Sagging rooflines
- Long-term damage to framing and supports
Your roof structure was designed for one layer — not two.
It hides problems that should be fixed
The biggest danger of a second layer is what you can’t see.
If there is:
- Water damage
- Rotted wood
- Mold
- Soft or weak decking
A second layer will cover it up instead of fixing it. That hidden damage will continue to spread — silently — underneath the new shingles.
When the problem finally shows up inside your home, it will be much more expensive to repair.
A new roof should fix problems, not hide them.
Your new shingles won’t last as long
Shingles are meant to lie flat on a solid, even surface. When you install them over old shingles, they don’t sit properly.
This causes:
- Uneven appearance
- Poor sealing
- Increased wind damage
- Reduced lifespan of the roof
Even “brand new” shingles can fail years earlier when installed over an old layer.
You’re paying for a new roof… but not getting full value from it.
Many manufacturers won’t honor the warranty
This is a big one.
Many roofing manufacturers (including major brands) may void or reduce the warranty if shingles are installed over an existing layer, especially if proper inspection and preparation were not done.
If something goes wrong later, you could be stuck covering the full cost — even if the materials fail.
That risk alone usually outweighs any short-term savings.
Insurance companies may question or deny claims
In some cases, insurance companies may:
- Reduce claim payouts
- Question roof installation quality
- Deny coverage for damage caused by improper installation
This becomes a huge issue if your roof fails during a storm and your insurance carrier sees it has been installed over an existing layer.
The “cheaper” option can end up costing you the most.
So when is a second layer ever okay?
In very limited cases, local code may allow a second layer. But allowed does not mean recommended.
For most homeowners, a full tear-off and replacement is:
- ✓ Safer
- ✓ Longer-lasting
- ✓ Better for resale value
- ✓ Better for insurance purposes
- ✓ Better for your home’s structure
A proper roof replacement isn’t just about shingles — it’s about what’s underneath them too.
The Pro Exteriors approach: Do it right the first time
At Pro Exteriors, we believe in doing the job correctly, not cutting corners.
Our full roof replacement process allows us to:
- Inspect and repair roof decking
- Fix hidden water or structural damage
- Install underlayment and waterproof barriers properly
- Give you the best possible warranty & performance
We don’t just replace your roof. We protect your home.
401-688-0986 Contact Pro Exteriors today for an honest roof evaluation.
Serving Rhode Island with expert exterior solutions. If you’re going to invest in a new roof, make sure it’s done the right way — the first time.