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Metal Roof Questions

Metal Roof Warranty Near Salt Water: What Is Covered?

Many metal roof warranties exclude salt spray or apply only beyond a set distance from salt water. Published limits range from 400 feet to one mile, and the common figure is 1,500 feet. A paint warranty does not cover rust on the metal. Read each warranty's finish and substrate sections.

By Josh Hildebrand, owner of Coastline Roofing · Florida license CCC1331076 ·

You live near the water and want a metal roof, and the warranty fine print sounds scary. Here is what real manufacturer documents say.

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The basics

Does a metal roof warranty cover salt air damage?

Usually only in part. Many warranties exclude salt spray or only apply beyond a set distance from salt water, and paint coverage is separate from rust coverage.

A metal roof usually comes with more than one warranty, and each covers something different. Sheffield Metals, a coil supplier, splits them into three types:

  • Substrate warranty. Covers the base metal under the paint against corrosion through, under normal atmospheric conditions.
  • Paint or finish warranty. Covers the paint cracking, flaking, peeling, chalking and color fade past set limits.
  • Weathertightness warranty. The installer and the maker take responsibility for leaks from defects or workmanship, under the terms written in it.

Salt water is where the fine print gets tight. Drexel Metals, a coil maker, writes that a paint warranty does not cover corrosion of the base metal in a saltwater environment. So a roof can have a long paint warranty and still have no cover if the metal rusts. If your home is near the Gulf, Tampa Bay, a canal or a tidal river, read the warranty before you buy, not after a claim.

Metal roofs are one of the best roofing choices for coastal Florida when the product matches the setting. Our metal roofing page covers what Coastline installs, which is 24-gauge standing seam and 5V crimp.

Near the water and thinking metal?

Coastline installs 24-gauge standing seam and 5V crimp metal roofs. We can go over the metal and finish options with you and review the manufacturer's actual warranty document before you decide. Coastline Roofing works all over Florida (license CCC1331076).

Call (941) 896-7793 or text your town and a photo.

The fine print

What distance limits show up in real warranties?

Published limits range from a few hundred feet to one mile, depending on the maker and the metal.

There is no single rule. The 1,500 foot figure you may have heard is real in some warranties, but it is each maker's own term. Here is what four published documents say:

Examples of salt water limits in published metal roofing documents
DocumentWhat it says
Sheffield Metals, Galvalume steelSubstrate warranties do not cover constant salt or fresh water spray. Listed distances: within 1,500 feet of breaking surf, within 800 feet of a large bay, within 400 feet of a marsh.
Sheffield Metals, painted aluminumNo distance table, but the warranty requires an annual fresh tap water rinse for panels within one mile of a seacoast, saltwater or brackish water.
Metal Sales, PVDF coil warrantyFilm integrity, chalk and fade coverage (35 to 45 years) apply only if the distance from a salt water environment exceeds 1,500 feet. It also excludes salt spray and excessive salt atmospheres.
Western States Metal Roofing (installer blog)Says standard aluminum panel warranties often include a proximity to ocean clause, and that 1,500 feet is the most common distance. Custom coastal warranties are set job by job and small projects may not qualify.

Brackish water is a mix of salt and fresh, and it shows up in tidal rivers and bays across Manatee and Sarasota counties. Sheffield names it in the aluminum rinse rule. So when you measure a distance, measure to the nearest water, not only to the beach. Marsh and bay edges count in Sheffield's Galvalume table too, at 400 and 800 feet.

One more thing to know: the warranty is only as good as the paper behind it. Sheffield's guide says to read each warranty's inclusions and exclusions in full and to contact the maker with questions, since its own lists are not complete.

What can void it

What can cut off coverage on a coastal metal roof?

Salt distance is only one reason a claim gets denied.

You are inside the distance

If the home is within the warranty's listed distance, the finish or the metal may simply not be covered. Metal Sales says the warranty applies only beyond 1,500 feet of a salt water environment.

The rinse was skipped

Sheffield says missing the annual fresh water rinse is an exclusion on its painted aluminum warranty near salt water. Drexel also recommends a periodic fresh water rinse for coastal roofs.

Scratches and cut edges

Drexel notes that shearing an edge or scratching the surface weakens the system that protects the steel, and corrosion can start there, especially in salt air.

Field painting

Metal Sales states its warranty does not apply to panels that have been field painted. See our guide on painting a metal roof before anyone repaints.

Dissimilar metals

Metal Sales says contact with a dissimilar metal like copper, or water carrying it, is not covered. Sheffield lists galvanic reactions from incompatible fasteners or products as a paint warranty exclusion.

A late or incomplete claim

Metal Sales requires claims within 30 days after the buyer finds the problem, with records of the order, ship date and install date. Sheffield tells owners to file paperwork on the maker's timeline.

How to check

How do you check the warranty on a metal roof near salt water?

Get the exact product name, read the finish and substrate sections for distance language, and get any exceptions in writing.

You do not need to be an expert. You need the right paper and a few clear questions.

  1. Get the product name and the maker

    Ask your roofer for the panel brand, the metal (Galvalume steel, galvanized steel or aluminum) and the finish. The warranty belongs to the maker of that exact product.

  2. Read the finish section and the substrate section

    They are separate. Look for words like salt water, salt spray, coastal, marine or hostile environment, and any distance in feet or miles.

  3. Measure from your roof to the nearest salt or brackish water

    Use a map. Count the Gulf, bays, canals and tidal rivers, not only the beach.

  4. Read the care rules

    Some warranties require a yearly fresh water rinse. AkzoNobel, a coatings maker, says annual washing is the only regular upkeep a baked-on finish needs. Write the date on your calendar when the roof goes on.

  5. Find out who the warranty is from

    Maker warranties, installer warranties and combined weathertightness warranties are different. Ask which one you are getting and what each one covers.

  6. Keep records

    Metal Sales requires records that tie the claim to the order and install dates. Keep the invoice, the product order number and the warranty in one folder.

No roofer can promise what the manufacturer's paper excludes

Coastline does not write the maker's terms. We can coordinate the metal choice and show you the manufacturer's actual warranty document before you sign. If the home is close to salt water, ask the maker in writing whether your address qualifies.

Choosing the metal

Which metal works best near salt water?

Aluminum is the usual pick for coastal homes, and warranty terms on aluminum are often shorter.

Sheffield Metals says aluminum is better suited to saltwater environments than Galvalume steel, though its substrate warranties are shorter, about 20.5 years or less. Western States Metal Roofing goes further and says roofing near the ocean should not have a steel base, and that warrantable coastal panels are generally aluminum. That is one installer's view, so ask the maker rather than take it from a blog.

Steel is not off the table for every coastal home. Distance, exposure and the exact product all change the answer. Our guides to aluminum vs steel roofs and Galvalume vs galvanized roofing go through the trade-offs, and metal roof rust in coastal Florida shows what early corrosion looks like.

If you already have a metal roof and see rust at edges, fasteners or cut ends, an inspection with a written photo report is the next step. For help with the metal choice on a new roof, our metal roof cost guide explains what moves the price.

Reviews

What homeowners say about working with Coastline

★★★★★
"From beginning to end the roof was done in 2 days. One night the crew stayed until 8:00. Each evening before leaving the crew ensured the yard was cleaned. We are so happy, and our roof is beautiful!"
Sharon T.Roof replacement
★★★★★
"Russell was great to work with. He was prompt in coming out to assess our roof and very knowledgeable. ... The job was complete in 2 days once work began."
Bryan S.Roof replacement
★★★★★
"Josh was especially amazing. He was professional, patient, and took the time to explain everything clearly so I felt comfortable and informed throughout the entire process. You can tell he genuinely cares about his customers and takes pride in his work."
Madison T.Roofing customer
Keep reading

Related guides

Metal Roofing

Standing seam and 5V crimp metal roofs from Coastline.

See our metal roofing →

Roof Warranty Types

The kinds of roof warranties and what each one covers.

Read the warranty guide →

Is My Metal Roof Rusting?

Signs of rust and what they mean on the Gulf Coast.

Read the rust guide →

Also see aluminum vs steel metal roof and painting a metal roof.

FAQ

More questions

Is the 1,500 foot rule a law?

No. It is a term written into some manufacturers' warranties. Metal Sales applies it to its PVDF coil warranty, and Western States Metal Roofing says it is the most common distance on aluminum panel warranties. Sheffield Metals lists 1,500, 800 and 400 feet depending on whether the water is surf, a large bay or a marsh.

Does the annual rinse really matter?

On some warranties, yes. Sheffield Metals says its painted aluminum warranty requires an annual fresh tap water rinse within one mile of a seacoast, saltwater or brackish water, and skipping it is an exclusion. Drexel Metals also recommends a periodic fresh water rinse for coastal roofs.

Does a paint warranty cover rust?

Generally not. Drexel Metals writes that corrosion of the base metal from salt exposure is generally not covered by a paint warranty. Western States Metal Roofing says the same: a paint warranty covers the paint, not corrosion of the material. Ask for the substrate warranty terms separately.

Can I still put a metal roof within the distance limit?

You can, but the warranty may not apply. Western States Metal Roofing says custom coastal warranties exist, set job by job based on location, climate, building design and color, and small projects may not qualify. Ask the maker in writing whether your address and product are covered.

Do pools or other things affect a paint warranty?

They can. Sheffield Metals says environmental factors such as livestock buildings, water treatment facilities and pools can affect paint warranty eligibility. Read the exclusions list in your actual warranty, because the lists in guides like this one are not complete.

Sources

  1. Sheffield Metals: Metal Roof and Wall Warranty Types
  2. Metal Sales Manufacturing: PVDF System Warranty, Coil (Dec 2023)
  3. Drexel Metals (Metal Roofing magazine, 2003): Paint Warranties, Do They Apply in Coastal Environments?
  4. Western States Metal Roofing: Metal Roofing in Coastal Areas, Paint Warranties
  5. Sheffield Metals: Learning Center, coastal distances and aluminum rinse rule
  6. AkzoNobel: PVDF and SMP Metal Roofing Care and Maintenance

Get the warranty paper before you sign

If you are near the water and weighing metal, Coastline can walk you through the metal options and review the manufacturer's warranty with you, and give you a written photo report on the roof you have now.

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