Find out when a full tear-off is necessary before installing a metal roof. Learn Colorado code requirements, pros and cons, and how Roof Nuts helps you make the right call.

Do You Need to Tear Off Your Old Roof Before Installing a Metal Roof?

Metal Roofing
September 02, 2025•2 min read

Metal Roof Tear-Off: Do You Really Need to Remove the Old Roof?

If you’re considering a metal roof in Colorado, one big question often comes up:

Do I have to remove my old roof first?

The short answer:
Sometimes yes — but not always.

Let’s break it down simply.

When You Don’t Need a Tear-Off

In many cases, metal roofing can be installed directly over one layer of existing shingles or even an old metal roof.

✅ This saves time and labor costs
✅ It avoids unnecessary landfill waste
✅ It adds a layer of insulation and sound dampening

But there are rules.

According to the 2021 International Residential Code (IRC) and most Colorado building departments:

You can only install a new roof over one existing layer. Two or more layers must be torn off first.

When a Tear-Off Is Required

Here’s when removal is necessary:

  • More than one existing roof layer

  • Damaged or rotted roof decking

  • Local code requires tear-off for metal systems

  • Trapped moisture under old shingles

  • Insufficient attachment for new fasteners

Colorado building codes — and smart roofing practice — require solid sheathing that’s dry, clean, and flat for proper metal roof installation.

What Roof Nuts Looks For

We always inspect your roof first. Our team checks:

  • Decking condition

  • Ventilation needs

  • Shingle layers

  • Existing fastener pattern

  • Ice dam or water damage signs

We only recommend a tear-off when it protects your long-term investment.

What Are the Benefits of Tearing Off?

Even though it costs more up front, a tear-off offers:

  • A clean slate for ventilation upgrades

  • Better long-term roof performance

  • A chance to inspect and repair roof structure

  • Peace of mind — no hidden damage beneath

In places like Denver, Fort Collins, and Colorado Springs where snow, hail, and wind are common, a tear-off may be the safer call.

Common Questions About Metal Roof Tear-Off

Can I install a metal roof over shingles?
Yes, if there’s only one existing layer and the decking is sound. Code allows it.

Does a tear-off add much cost?
It depends on the size of the roof and number of layers, but expect $1.00–$2.50/sq. ft. for removal and disposal.

Will skipping the tear-off affect warranty?
It could. Some manufacturers require a clean deck for full warranty coverage.

Do Colorado building codes require tear-off for metal roofs?
Not always — but many cities follow the IRC, which restricts layering. Always check with your local building department or ask us.

Serving Colorado Homeowners and Property Managers

We help homeowners and property managers across:

  • Denver

  • Colorado Springs

  • Fort Collins

  • Lakewood

  • Aurora

  • Thornton

  • Westminster

  • Arvada

  • Pueblo

  • Greeley

We also serve Georgia’s major cities through our Roof Nuts GA team.

Talk With the Pros Before You Decide

Not sure if your roof needs a tear-off?

Let Roof Nuts take a look. Our expert metal roofing crew gives you clear answers with zero pressure.

📞 Call us in Colorado: 303-276-2403
🌐 Visit RoofNutsCO.com

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