Metal roofing on a Fairfax Station house: what has to be true first
Four out of five Fairfax Station homes went up between 1970 and 1989, so metal here is usually a re-roof of a house with decades behind it. Before panels are ordered, five things need answers: the slope, the review, the underlayment, the snow and the permit.
1. Is the slope enough for the panel?
| Panel style | Code minimum slope | A maker's own figure |
|---|---|---|
| Lapped screw-down panels, no sealant | 3:12 | 3:12 for one ribbed exposed-fastener panel |
| Lapped panels with sealant in the laps | 1/2:12 | Check the product sheet |
| Standing seam | 1/4:12 | 1/4:12 for one mechanically seamed line, but another maker's snap-together panel can ask for more |
The maker's published minimum beats the code figure, so a low porch roof narrows the choice fast. A true flat section is a job for a membrane, not panels.
2. Does anyone besides the county need to say yes?
Yes, in a few cases, and none of them is the county permit counter. Approvals for panel color and profile come from three other places:
- Your association, if you have one. Crosspointe is a separate Census place from the Fairfax Station community around it. Ask your board in writing.
- The Town of Clifton, if your parcel is inside it. The Town has its own Architectural Review Board, and we understand it asks for a certificate of appropriateness ahead of the county permit. Whether a like-for-like re-roof needs one is not something we could confirm, so call the Town.
- A county Historic Overlay District, if one covers your lot. None of the county's 15 is named Fairfax Station. Robey's Mill is on Popes Head Road, and the county can say whether your lot falls inside its line.
3. What goes under the panels, and what snow does on top
Virginia's ice barrier rule lists asphalt shingles, metal roof shingles, mineral roll roofing, slate and wood, and Fairfax County does designate ice barriers. Metal panels are not on the list, so their underlayment follows the general rule and the panel maker's instructions. One maker recommends a high-temperature underlayment at 3:12 and below.
Snow is a design question. The county's design ground snow load is 25 pounds per square foot. A smooth panel can send a slab onto a front step or a car, so note what sits under each eave and decide on snow guards before panels are ordered.
One more material fact: metal panels expand and contract with every temperature swing. On screw-down panels, that movement and aging washers are the usual causes of leaking fasteners, so a yearly screw check belongs in the paperwork. See our metal roofing screws guide and the standing seam article.
4. What the county permit does and does not cover
Fairfax Station is unincorporated Fairfax County, so Fairfax County Land Development Services is the building official. Its guidance lists replacing roof shingles as work that needs no building permit, and it lists roof repairs and chimney repairs as permit work. Ask the county how a metal panel re-roof is classified. State code exempts replacing roof covering on houses, subject to a wind-speed condition, but not more than 256 square feet of decking or fire-rated decking. Confirm your scope with the county before work starts.
Two typical Fairfax Station metal projects
A hip roof on a house from the early 1980s
The roof is a plain hip of about 28 squares at a 6:12 pitch, with tired shingles and no one in the house keen on a fussy profile. Pitch is well above the 3:12 line, so either panel style could work. We would show you both, explain that standing seam hides its fasteners while screw-down panels need screw checks, and put the chosen finish in writing for the association first if there is one. Tear-off, underlayment per the maker and trim take most of the job.
A front porch roof and a bay cap at 2:12
The two small roofs together are about 150 square feet at a low slope, under the 3:12 line for screw-down panels. A standing seam product with a published low-slope minimum is the realistic metal option, and if no product qualifies, we would say a membrane or shingles fit better. The owner sees the slope measurement and the maker's minimum on paper before ordering.
Metal is the wrong choice when
- The roof is below the panel maker's minimum slope.
- Your association or the Town of Clifton says no, and the answer is not in writing yet.
- You want zero fastener upkeep but have screw-down panels in mind.
- The only goal is a bill saving. Savings depend on color, insulation and attic ventilation, so no figure can be promised.
On a house where shingles still have years left, a shingle repair or replacement may be the better answer. The Fairfax County roof replacement article covers the comparison.
Frequently Asked Questions
Does the Crosspointe homeowners association have a rule about metal roofs?
Crosspointe is its own Census place and has a homeowners association. If you live there, ask the association in writing before anything is ordered, and do the same for any other Fairfax Station community with an architectural committee. The panel profile, finish and color are the details worth writing down for the request.
My house is in the Town of Clifton. Does a metal roof need design review first?
Clifton is an incorporated town with its own Architectural Review Board. The Town adds its own approval step ahead of the county building permit. Call the Town before you order panels to learn whether your re-roof needs a certificate of appropriateness.
Is my house inside Robey's Mill or another county historic overlay district?
Fairfax County has 15 Historic Overlay Districts and none is named Fairfax Station. Robey's Mill, on Popes Head Road, is the one nearest by road; the county can say whether an address falls inside its boundary. State code lets the building official require a roofing permit in a locally designated historic district. If your parcel might be inside one, ask the county's Architectural Review Board first.
Do I need ice and water shield under metal panels in Fairfax County?
The code's ice barrier rule lists asphalt shingles, metal roof shingles, slate and wood, not metal panels, and Fairfax County does designate ice barriers for the listed coverings. For panels, the underlayment follows the code's general rule and the maker's instructions. One maker recommends a high-temperature underlayment at 3:12 and lower slopes. We specify what the panel maker calls for.
What does 24 gauge versus 29 gauge mean for a house roof?
Gauge is the thickness of the steel, and a lower number is thicker. Makers publish 24, 26 and 29 gauge options, and a thicker panel is stiffer. No single gauge is right for every roof. Panel type, rib shape and the support underneath matter as much, so choose the gauge together with the profile and the deck, not alone.
Metal estimates around Clifton and the Parkway
Reston Roof, based in Reston, quotes metal roofs on houses along Clifton Road, Ox Road and the Fairfax County Parkway, and the Fairfax Station Railroad Museum on Fairfax Station Road is a landmark owners often use to describe where they live. We look up the parcel first because a Fairfax Station mailing address can belong to the Town of Clifton or to Crosspointe. The service area list shows the full reach.
Weighing metal for your house?
Give us the pitch, the community and whether you want the whole roof or a porch. The reply covers which panel style fits and what has to be approved. Call (571) 453-6515.
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