Start here

Quick, low-risk steps

  1. Use binoculars or ground-level photographs to note your current roof material and visible condition.
  2. Collect your roof’s age, any prior repair records, and the approximate roof area from a recent survey or satellite measurement.
  3. Ask each bidder to specify the metal type, gauge, profile, and coating system in writing.
  4. Request a line-item scope that separates tear-off, decking allowance, underlayment, flashings, and trim.
  5. Confirm that the quoted system is approved for your roof pitch and local wind zone.
  6. Compare warranties side by side, noting coverage for finish, substrate, and workmanship.

Common Metal Roof Systems

Metal roofing comes in three broad categories: standing seam, metal shingles or tiles, and corrugated or ribbed panels. Standing seam uses concealed fasteners and raised vertical seams, which can reduce leak points. Metal shingles mimic traditional materials like slate or wood shake but are formed from steel or aluminum. Corrugated panels are often used on agricultural or low-slope structures and typically have exposed fasteners.

Each system has different attachment requirements, minimum slope limits, and wind-resistance ratings. The manufacturer’s evaluation report and local building code determine whether a particular system is allowed on your roof. Always ask for the specific product approval number and installation standard referenced in the quote.

  • Standing seam: concealed fasteners, 1.5-inch to 2-inch seam height common
  • Metal shingles: interlocking panels that resemble slate, tile, or shake
  • Corrugated panels: exposed fasteners, often used on slopes 3:12 and above
  • Verify the minimum roof pitch allowed by the manufacturer for each system
  • Ask whether the system is tested for the wind zone applicable to your address

Material Specifications That Affect Cost

The base metal, thickness (gauge), and protective coating largely determine durability and price. Common substrates include 24-gauge or 26-gauge steel, aluminum, and occasionally copper or zinc. A thicker gauge generally resists denting better but adds weight and cost. Coatings such as Galvalume or Kynar 500 provide corrosion resistance and color retention.

Finish warranties vary significantly by product and may be prorated. Some manufacturers require specific underlayments or ventilation to maintain the warranty. Ask for the warranty document and note any exclusions for coastal or industrial environments, even if Atlanta is inland.

  • Steel: typically 24 or 26 gauge; Galvalume or galvanized coating
  • Aluminum: lighter, often used in coastal areas; may cost more than steel
  • Coating: PVDF (Kynar 500) offers longer color and chalk resistance
  • Finish warranty: check for prorating, transferability, and labor coverage
  • Underlayment: high-temperature self-adhered membrane often required under metal

Key Quote Line Items for Metal Roofs

A complete metal roof quote should break out the same scope items as any roof replacement, plus metal-specific components. Look for separate line items for the metal panels or shingles, trim and flashing, fasteners, and any required underlayment or slip sheet. The quote should also state whether the existing roof will be torn off or if the metal will be installed over it.

Installation over existing shingles may be allowed by code in some cases, but it can trap moisture and void the metal manufacturer’s warranty. Ask the contractor to confirm the decking condition and whether any sheathing replacement is included in the base price or handled as a per-sheet allowance.

  • Metal panel or shingle material: specify gauge, profile, and coating
  • Trim and flashing: ridge, rake, eave, valley, and penetration flashings
  • Fasteners: type, spacing, and corrosion resistance (e.g., stainless steel)
  • Underlayment: high-temperature self-adhered or synthetic, per manufacturer
  • Decking allowance: per-sheet cost if replacement is needed after tear-off

Questions to Ask Before You Sign

Before accepting a bid, verify that the contractor has experience with the specific metal system you are buying. Ask for a copy of the manufacturer’s installation instructions and confirm that the crew will follow them exactly. Request a written change-order policy that explains how unexpected decking damage or code upgrades will be priced.

Permits and inspections are required for roof replacements in Atlanta. Confirm that the contractor will pull the permit and schedule all required inspections. The City of Atlanta’s zoning and permitting office provides current workflow information, but rules and service coverage vary by exact jurisdiction.

  • Ask for proof of the manufacturer’s training or certification for the system
  • Request a copy of the installation manual and wind test report
  • Get a written change-order policy with unit pricing for decking and upgrades
  • Confirm permit and inspection responsibility in the contract
  • Check that the warranty registration will be completed by the contractor

Take this with you

Evidence and scope checklist

  • Metal type, gauge, and coating specified in writing
  • Panel profile and seam height (if standing seam)
  • Fastener type, material, and spacing
  • Underlayment product and installation standard
  • Tear-off or overlay decision and decking allowance
  • Trim, flashing, and penetration details
  • Permit and inspection responsibility
  • Manufacturer’s installation instructions referenced
  • Warranty: finish, substrate, and workmanship terms
  • Change-order policy for hidden decking or code upgrades
Open the interactive private worksheet →

Common questions

What homeowners ask next

Can metal roofing be installed over existing shingles?

In some cases, local building codes allow metal roofing over one layer of shingles, but this can trap moisture and may void the metal manufacturer’s warranty. Always check the manufacturer’s instructions and your local code before choosing an overlay. A full tear-off allows inspection of the decking and is often the safer long-term choice.

What is the difference between 24-gauge and 26-gauge steel?

Gauge refers to the thickness of the steel; 24-gauge is thicker and more resistant to denting than 26-gauge. The thicker material adds weight and cost. The appropriate gauge depends on the panel profile, roof slope, and local wind loads. Ask your contractor to justify the gauge selection based on the manufacturer’s specifications.

Do metal roofs require special underlayment?

Yes, most metal roof manufacturers require a high-temperature self-adhered underlayment or a specific synthetic underlayment to protect against condensation and leaks. The underlayment type must match the metal system and roof slope. Using the wrong underlayment can void the warranty.

Evidence

Sources used for this guide

Research checked July 31, 2026

Optional next step

Need an on-site professional?

Use the guide and worksheet first so you can describe the situation and compare the full scope. A referral is optional; you can also contact a licensed local provider directly.

Referral matching is not enabled yet.

We have not enabled a provider route for this site. Use the checklist to contact and verify local providers yourself; urgent hazards should go to the appropriate emergency or public service.