Learn whether you can install metal roofing over shingles in Florida. Understand when it’s a smart option, when it’s not, and how Roof Nuts can help you decide.

Can metal roofing go over shingles?

Metal Roofing FAQs
September 03, 2025•2 min read

Can Metal Roofing Be Installed Over Shingles?

Yes, metal roofing can be installed over shingles in certain cases — but it depends on the condition of your existing roof.

In Florida, this is a common question homeowners ask when they’re looking to upgrade to metal roofing without the added labor and cost of tearing off the old roof.

When Is It OK to Install Metal Over Shingles?

It’s typically allowed and safe when:

  • The existing shingle roof is flat and even

  • The shingles are not curled or brittle

  • The roof deck is dry, firm, and not rotted

  • There’s only one existing layer of shingles

Installing metal over shingles can reduce labor costs and landfill waste. It also provides an extra layer of insulation and protection if the structure beneath is sound.

When Should You Avoid It?

You should avoid installing metal over shingles if:

  • Your shingles are severely curled or cracked

  • The decking underneath is spongy or damaged

  • There are multiple layers of shingles already

  • There’s existing moisture trapped beneath the shingles

In these cases, covering the problem won’t solve it — it can lead to long-term damage, leaks, and costly repairs.

Does It Meet Florida Building Code?

Florida building codes allow metal-over-shingle installations in most municipalities — but they also require a proper inspection of the existing structure. For example:

  • The 2021 Florida Building Code allows roof-overs on single-layer shingle roofs when local load calculations and underlayment requirements are met.

  • Permits are required, and compliance with local wind uplift standards is a must.

What Does Roof Nuts Do?

At Roof Nuts, we don’t guess — we inspect.

We evaluate:

  • Shingle condition and wear

  • Decking integrity

  • Ventilation and moisture concerns

  • Local code and HOA restrictions

We’ll give you a straight answer: If a metal-over-shingle install makes sense, we’ll do it right. If not, we’ll explain why and give you your best options.

FAQ

Can metal roofing go over 2 layers of shingles in Florida?
No. Florida building codes typically don’t allow metal roofing to be installed over more than one layer of shingles.

Will the old shingles cause rust or damage to the metal roof?
Not if done correctly. A proper underlayment or purlin system is installed between the metal panels and shingles to prevent abrasion, moisture entrapment, or rust issues.

Will it look uneven?
Only if the shingles underneath are warped or the deck is damaged. A proper inspection ensures the surface is even and prepped before installation.

Is it cheaper to install metal roofing over shingles?
Yes, you save on labor and tear-off disposal. But only if your existing roof is in good condition.

Will Roof Nuts check my current shingles before recommending metal roofing?
Absolutely. Call us at 904-694-3426 and we’ll come inspect your roof and give you honest feedback.

Ready for an inspection to see if metal-over-shingle is right for your Florida home?
Call Roof Nuts at 904-694-3426 or contact us online to schedule a free roof evaluation.

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