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Metal roofing in Fairfax, VA: what the code and the permit offices actually say
Neither the City of Fairfax nor Fairfax County prints a page about metal roofs. What exists is Virginia's residential code, a reroofing section that names standing-seam metal, a county permit list and a county load table. This page reads those documents line by line, marks where they are silent, and lists what to ask. Which Fairfax holds your parcel is covered in the Fairfax hub.
- 25 psf ground snow load on the county load table
- 115 mph ultimate wind speed for residential in the county table
- 0.019 inch minimum thickness for metal flashing in the code
What each office prints
A metal roof raises one question the permit pages never answer directly: does the product matter to the permit? Here is what each government says, and the gaps.
Fairfax County, Land Development Services
The no-permit list for residential work includes "Replacement of roof shingles" and replacing less than 256 square feet of roof plywood, unless the plywood must be fire rated, as on townhomes. Roof repairs are on the permit list, and the miscellaneous permit page names "Re-Roof/Re-Line". For commercial buildings, replacing less than 100 square feet of roof covering needs no permit.
Metal is not mentioned on any of these pages.
City of Fairfax, Code Administration
The permit FAQ (archived copy) calls for a permit for framing changes, rafters included, and for "Repairs not exempted in Building Code Section 108". Roofing is not named. The office number the City prints is 703-385-7830.
A City page that says what to do when a metal panel replaces a shingle does not exist among the pages read.
Underneath both sits the state list, 13VAC5-63-80. It exempts replacing roof covering in groups R-3, R-4 and R-5 where the nominal design wind speed is not above 100 mph, and replacing 100 square feet or less in any group. Exception 1 lets a building official require an application for replacement roofing in a locally designated historic district. The county table prints a different wind measure, an ultimate speed, so the exemption's wind condition is a question to put to the office.
The county's no-permit entry says "shingles". A standing-seam panel or a lapped metal sheet is not a shingle, and the entry does not say whether it counts. That is a reason to ask, not a reason to assume either way.
Code clauses that touch a metal roof
| Clause | What it says | What to ask |
|---|---|---|
| Fire class (R902.1) | Class A, B or C is required in jurisdictions designated by law or where the roof edge is under 3 feet from a lot line. Metal sheets and shingles on noncombustible decks count as Class A; on a combustible deck the only metal named is copper sheet of at least 16 ounces per square foot. | Which tested assembly is on the scope, and what is the deck? |
| Deck (R905.10.1) | Metal panels go on solid or spaced sheathing, unless the panel is designed for spaced supports. | Is the existing deck solid, and does the product need it? |
| Underlayment (R905.1.1) | Underlayment under metal roof panels and metal shingles must meet the standards listed in the chapter. | Which underlayment is named? |
| Ice barrier (R905.1.2) | Where the climate table records ice at the eaves, the clause names metal roof shingles, not metal roof panels. Where it applies, it runs to 24 inches inside the wall line, and 36 inches along the slope at 8 in 12 or steeper. | Does the building official treat the panel as covered? The county table says "yes" to ice shield underlayment. |
| Flashing (R903.2.1) | Flashing goes at wall intersections, slope changes and openings. Metal flashing must be corrosion resistant and at least 0.019 inch thick. | What gauge and metal are the flashings? |
| Cricket (R903.2.2) | A chimney or penetration wider than 30 inches gets a cricket or saddle on its ridge side, covered in sheet metal or the roof material. | Is a wide chimney in the scope? |
| Solar (R902.4) | Rooftop panels on the covering are tested and listed to UL 2703 and fire classified. | Is an array planned over the new roof? |
Source: 2021 Virginia Residential Code, Chapter 9 (third-party copy, checked October 19, 2026), and the county Codes and Standards page for the ice shield line. Slope minimums for each panel type are on the metal roofing guide.
Recover or replace: the reroofing section
Chapter 9 of the residential code has a reroofing section, and it is where metal gets named. The terms below are the code's own.
- Replacement
- Removal of existing layers of covering down to the roof deck. The one exception lets an adhered ice barrier membrane stay and take a second layer.
- Recover
- A new covering over the old. Allowed where the new covering follows its maker's instructions.
- Standing-seam clause
- "Complete and separate roofing systems, such as standing-seam metal roof systems", that carry roof loads to the structure and do not rely on the old roof need no removal of existing coverings.
- Coatings
- A new protective coating over an existing coating, metal roof panel or metal roof shingle can go on without tear-off.
- Not allowed
- A recover over a water-soaked or deteriorated base, over slate, clay, cement or asbestos-cement tile, or over a roof with two or more coverings already.
- Wood shake
- Metal panels and shingles may go over wood shake, but if that leaves a combustible concealed space, the whole surface is covered with gypsum board, mineral fiber, glass fiber or another approved material.
Two further lines matter on a Fairfax roof. Reroofing does not have to meet the quarter-inch-in-twelve minimum slope where a roof already drains positively, and the reinstallation clause says existing flashings, edgings and vents that are rusted, damaged or deteriorated are replaced. The Metal Construction Association (MCA) presents installing over an existing roof as a way to avoid tear-off, but its page is a trade statement and the code sets the conditions.
The code text read here covers the residential volume. The county also lists the 2021 Virginia Existing Building Code, which this page did not open, so an apartment, condo or co-op roof should be taken to the county's commercial path, as the Fairfax hub describes.
Snow, wind and sliding snow
County figures from its Codes and Standards page; code figures from Chapter 9 of the 2021 Virginia Residential Code, read from a third-party copy because the code publisher blocks automated access. Checked October 19, 2026.
The county's Local Design Load Criteria table gives a ground snow load of 25 psf and ultimate wind speeds of 105, 115 and 120 mph by risk category, with 115 mph for Risk Category II and residential. The county adds that the 25 psf figure is valid only where the design team uses the 2021 state code's figures and ASCE 7-16 throughout, and that a different path means the posted number does not apply. The code also requires roof coverings to be installed to the manufacturer's instructions and to resist the component and cladding loads in its own table.
None of that says which panel passes. The MCA's pages say its metal roof systems are designed to meet wind and uplift tests named ASTM E1592, UL 580 and UL 1897, so a quote can name the test and the attachment that went with it.
"All snow-guard systems represent a load chain" to carry sliding forces into the building.
Metal Construction Association, Snow Retention Systems for Metal RoofingThe MCA says a slippery pitched roof can drop snow and ice below the eaves and that retention systems exist to reduce that risk, with every link, from the guard to the attachment, proven to take the load. The code chapter read does not mention snow retention, so this is a design question, not a code requirement found. Look below the eave: a door, a walk, a gutter or a neighbor's fence decides whether the question is worth asking.
Questions to settle before ordering
- Which government holds the parcel, and does its office treat a metal panel under the "shingles" or "re-roof" wording?
- How many coverings are on the roof now, and is the base dry and sound? The code bars a recover over two or more.
- Is the plan a recover or a tear-off, and does the written scope say which?
- What is the fire label for the assembly on that deck, especially within 3 feet of a lot line?
- Does the ice barrier line apply to this panel, given the county table and the code wording?
- What wind test and attachment does the product list, and what snow retention, if any, is planned?
- For a historic district parcel, has staff said whether a permit application is required?
Roofers of Arlington installs, repairs and replaces roofs, including metal roofing and flat roof systems. Book a phone consultation to talk through a Fairfax metal roof: have the street address, the current covering and a photo of the eave ready. See also roof replacement, materials, services and the service areas list.
Sources behind the Fairfax metal figures
- Fairfax County LDS: Does My Project Require a Permit? and the residential miscellaneous permit page, October 19, 2026
- Fairfax County LDS: Codes and Standards, October 19, 2026
- 13VAC5-63-80, Virginia Uniform Statewide Building Code, October 19, 2026
- 2021 Virginia Residential Code, Chapter 9 (third-party copy), October 19, 2026
- Metal Construction Association: Snow Retention Systems, Steep Slope Metal Roofing and Types of Metal Roofing, October 19, 2026
- City of Fairfax: Permit FAQs (archived copy, September 21, 2026)
Questions people ask
Can a metal roof be installed over existing shingles in Fairfax?
Virginia's residential code allows a recover where the new covering follows the manufacturer's instructions, and it says standing-seam systems that carry their own loads need no removal of the old roof. It bars a recover over slate or tile, over a wet or failing roof, and over a roof that already has two or more coverings. Ask the permit office and get the layers named in writing.
Does a Fairfax County metal roof need a permit?
The county's permit list says replacing roof shingles needs no permit and roof repairs do, and its residential permit page names "Re-Roof/Re-Line". Neither page mentions metal. State code exempts some replacement roof covering, with limits, so ask Land Development Services about your scope.
What fire class does a metal roof have under the Virginia code?
The code lists metal sheets and shingles on noncombustible decks as Class A assemblies. On a combustible deck, the only metal the code names as Class A is copper sheet of at least 16 ounces per square foot. Other builds need a tested label, so ask which assembly applies to your deck.
Does Virginia require an ice barrier under a metal roof?
Where the code's climate table records ice at eaves, its ice barrier clause names metal roof shingles but not metal roof panels. The county's load table separately answers "yes" for ice shield underlayment. The pages do not reconcile, so ask the building official what applies to your panel.
What snow load does Fairfax County use for roofs?
The county's Codes and Standards table prints a ground snow load of 25 psf and adds a condition: it holds only if designers use the 2021 state code figures and ASCE 7-16 throughout. Whether that table reaches a house re-roof is a question for the plans reviewer.
Do metal roofs need snow guards in Fairfax?
The code pages read for this guide do not address snow retention. The Metal Construction Association says slippery pitched roofs can drop snow and ice below the eaves and describes snow retention as a load chain into the structure. Ask your roofer and engineer whether the walkways, doors and gutters below the eave call for it.
Is the City of Fairfax different from the county for a metal roof?
The code is statewide, so the same roof sections apply. The offices differ: the City's permit FAQ does not name roofing, while the county lists shingles and repairs. Call Code Administration for a City parcel and Land Development Services for a county one.
Talk through your roof with Roofers of Arlington
Share the address, what you are seeing on the roof and the decision you need to make. We will tell you what to expect before anything is scheduled.