If your roof is showing signs of wear, you might be wondering if it's okay to install new shingles over the old layer. The short answer is: yes, you can-**but only in certain situations**. Let's look at the pros, cons, and what roofing experts suggest.
Is It Legal to Shingle Over an Existing Roof?
In many areas, yes. Most building codes allow up to two layers of asphalt shingles. However, you should always check local codes or ask a roofing professional.
When Is It Okay to Roof Over?
- Your existing shingles are in decent shape - No curling, missing, or spongy spots.
- No soft decking or leaks - The roof structure beneath must be solid and dry.
- You only have one layer already - Never go beyond two layers.
Benefits of Roofing Over Old Shingles
- Lower cost - You save on labor and disposal fees.
- Faster install - Less tear-off means a quicker turnaround.
- Less mess - Less debris around your property.
Drawbacks You Should Know
- Shorter lifespan - Overlay roofs usually don't last as long as full replacements.
- May void warranty - Some manufacturers don't warranty shingles installed over old ones.
- Hides problems - You can't inspect or repair the decking underneath.
- Extra weight - Two layers of shingles add a lot of weight to your structure.
What Do Roofers Recommend?
Many reputable roofers recommend a full tear-off unless your budget is tight and the roof is in excellent condition underneath. Removing the old shingles lets them inspect the roof deck, repair any damage, and ensure proper ventilation and flashing.
How to Know What's Right for You
The best decision depends on your roof's condition, budget, and how long you plan to stay in the home. A local contractor can inspect your roof and help you decide if an overlay is an option-or if it's time for a full replacement.
Talk to Local Roofing Pros Before Deciding
Still unsure if you should roof over or start fresh? RoofersSearch makes it easy to connect with qualified local roofers who can assess your roof and give honest, affordable advice. Compare quotes for free and protect your investment.