Can You Put a Metal Roof Over Shingles? 5 Critical Facts Every Florida Homeowner Should Know (2026)
When upgrading to a durable, energy-efficient metal roof in Central Florida, many homeowners look for ways to save on installation costs. One of the most frequently asked questions we get at Gravity Roofing is: can you put a metal roof over shingles? While the short answer is yes, the reality of doing so in Orlando’s unique climate and strict building code environment is much more complex. Let’s dive into the ultimate facts you need to know before making this major roofing decision.
Can you put a metal roof over shingles?
Yes, you can put a metal roof over shingles in many cases, as it saves on tear-off costs and reduces landfill waste. However, in Florida, building codes often restrict this if there are already two layers of roofing, or if the underlying decking is damaged and requires inspection.
5 Things to Consider Before Installing a Metal Roof Over Shingles
Before you decide to skip the tear-off process, you must understand how this installation method impacts your home’s safety and longevity. Here are five critical factors regarding a metal roof over shingles:
1. Florida Building Codes and Weight Limits
Florida has some of the strictest building codes in the country due to hurricane threats. The Florida Building Code outlines reroofing requirements, structural considerations, and limitations on multiple roof coverings. Generally, building codes prohibit having more than two layers of roofing on a structure. If your home already has a second layer of asphalt shingles, you absolutely cannot put a metal roof over shingles; a full tear-off is legally required. Even if you only have one layer, the added weight of the metal must be supported by your roof’s structural integrity.
2. Hidden Decking Damage
This is the biggest risk when you put a metal roof over shingles. Florida’s high humidity and heavy rains often cause hidden wood rot in the plywood decking beneath your old shingles. If you do not tear off the old roof, you cannot inspect the decking. Installing a premium metal roof over rotting wood is like building a mansion on a foundation of sand—it will eventually fail, especially during a hurricane.
3. Cost Savings vs. Long-Term Risks
The primary reason homeowners ask can you put a metal roof over shingles is to save money on labor and disposal fees associated with tearing off the old roof. While you might save a few thousand dollars upfront, you risk voiding manufacturer warranties if the old shingles cause the metal to warp or if trapped moisture leads to severe structural damage down the line.
4. The Importance of Furring Strips (Strapping)
If you and your contractor decide that you can put a metal roof over shingles safely, it shouldn’t be laid directly on top of the old asphalt. A professional installation requires adding wooden furring strips (or strapping) over the old shingles. This creates a flat, even surface for the metal panels and provides a crucial air gap that helps ventilate trapped heat and moisture, which is vital in Central Florida.
5. Smoothness and Aesthetics
Old shingles are rarely perfectly flat; they may be curled, blistered, or missing granules. If a metal roof is installed directly over a bumpy, uneven shingle roof without proper strapping, those imperfections can transfer through to the metal panels, causing a wavy appearance known as “oil canning.” For the sleekest look, a clean tear-off is always preferred.
Trust Gravity Roofing for Honest Advice
“We never recommend taking shortcuts when it comes to protecting your family from Florida storms,” says Taz Crumpler, President of Gravity Roofing. While it is technically possible to put a metal roof over shingles, we almost always advise our Orlando clients to opt for a full tear-off to ensure the roof deck is 100% sound.
If you are considering a metal roof upgrade and wondering about the best installation method for your specific home, our Central Florida inspection team is here to help. We will provide a thorough assessment and explain all your options transparently.
Ready to explore your metal roofing options? Contact Gravity Roofing today to book your free, no-obligation roof inspection or get an instant online roof estimate. Call us at (407) 461-0234 or visit us at 14 S Bumby Ave, Orlando, FL 32803.
