EPDM Roofs in McLean, VA: The County Sentence Naming It
Fairfax County's guide for its historic overlay districts names EPDM in a list of things it does not recommend. The sentence is real and narrower than it sounds. Below: what each phrase leaves open, and which McLean buildings it can reach.
The sentence, taken apart
Which words in the county's EPDM line do the work?
On page 65 of the Historic Overlay District General Design Guidelines (January 2026, marked Final Draft), under roofs and roof materials, the Not Recommended list includes using incompatible cladding material on highly visible roof slopes, such as terra cotta tile, wood shake, highly variegated asphalt shingles, visible rubber roofing materials such as EPDM and TPO, rolled roofing with seams that create visual horizontal bands, or other non-original materials.
“Highly visible roof slopes”
- What it says
- The concern is a covering you can see, on a slope you can see.
- What it leaves open
- The guide does not define “highly visible” or say from where: street, neighbor or both.
- Who answers
- Architectural Review Board, 703-324-1380.
“Such as EPDM and TPO”
- What it says
- Two membranes share a list with tile, shake, variegated asphalt shingles and rolled roofing.
- What it leaves open
- The list ends with “other non-original materials,” which assumes an original roof to compare against. For a house with no historic covering left, the page gives no test.
- Who answers
- Same board.
“Not recommended”
- What it says
- It is a guideline list. The Langley Fork guide says of its own text, “They are guidelines, not requirements” (page 6).
- What it leaves open
- How strongly staff weigh it on a given permit.
- Who answers
- Same board, then Land Development Services at 703-222-0801 for the permit itself.
It also draws flat roofs and a membrane
Page 64 lists flat among the roof forms found in the districts. The illustration on page 47 labels “vinyl membrane” and “rolled / flat roof” under common roofing materials. Page 74 favors certain roof products on “flat roofs, non-visible elevations.” So the guide knows flat roofs exist. It does not say how the EPDM line applies to one.
Who lives under which roof
Which McLean buildings could that sentence ever reach?
Census Bureau, ACS 2024 5-year estimates (2020 to 2024) for the McLean place. It counts homes, never roofs. The “our reading” lines are ours.
- Detached house14,358 homes; 988 are rented
The only home type the Langley Fork district rule allows. The guide's zoning summary says residential dwellings there “shall be limited to single family detached units” (page 22).
A rented house puts the decision with a landlord. Our reading: the EPDM line matters here only if the parcel is inside the overlay and the work needs a permit.
- Townhouse1,744 homes
Outside what the Langley zoning summary allows. A townhouse association's own documents may carry roof rules, so get them in writing.
- Two to 49 units237 homes, 1.3 percent
A thin slice. Counts this small carry wide margins of error.
- Buildings of 50 or more1,489 homes; 407 owner-occupied, 925 rented
Our reading: this is where a membrane question belongs, because a large building may carry low-slope sections the Census cannot see. The overlay guide is not aimed at these buildings.
For a Tysons address, the Tysons section of our McLean page has its own numbers.
On age, only 564 of 17,833 McLean homes date from 1949 or earlier (344 from 1939 or earlier, 220 from the 1940s). Another 6,321 were built in the 1950s and 1960s.
Line of the district
Is your parcel inside Langley Fork or outside it?
Inside the overlay
- Where
- About 71 acres around Georgetown Pike and Chain Bridge Road. The guide says the district is in McLean (page 24).
- The EPDM line
- The Langley guide sends applicants to the countywide guide, where the line sits. Its own text names no roof covering.
- When review applies
- The guide says review is “only required for work that requires a permit” (page 5).
Anywhere else in McLean
- Where
- Any address outside the Langley Fork boundary. Of the county's fifteen overlay districts, Langley Fork is the one whose guide says it sits in McLean; the other guides were not read for McLean addresses.
- The EPDM line
- It is guidance for overlay districts, so it does not reach a house outside one.
- The permit question
- County permit pages name replacing roof shingles as no-permit work and say nothing about a membrane. Ask Land Development Services.
The county shows the boundary as a map image, so a street name is not an answer. The board answers by address.
Before a membrane is priced
What should you pin down first?
- In or out of the overlayOne call to the board, with the street address.
- Which slopes face the streetThe county line is about visible slopes, so a photo from the curb helps the conversation.
- What the roof is made of nowThe line speaks of non-original materials. Say whether you know the original.
- Who owns the decisionOwner, landlord or association. Colour does not tell membranes apart, since SPRI says sheets come in black, white and many other colours, so ask for the product name.
Membrane background: flat roof and materials. County permit table: McLean.
Questions
Rubber-roof questions from McLean owners
Does Fairfax County ban EPDM roofs in McLean?
No page we read says so. The line is a not-recommended item in an overlay-district guide, and the Langley Fork guide calls its guidelines “not requirements.” A house outside an overlay district is not under that guide.
Does the line cover a flat roof nobody sees from the street?
It speaks of “highly visible roof slopes” and the guide never defines the phrase. Ask the board about the roof in question.
Does the Langley Fork guide itself mention EPDM?
No. The words EPDM, rubber and membrane do not appear in it. Only the countywide guide names EPDM, on page 65.
Is a white membrane treated differently from a black one?
The sentence names materials, not colours, and no page read gives a colour exception. Sheet membranes come in many colours, so a roof's colour alone does not say what it is.
How many McLean homes were built before 1950?
An estimated 564 of 17,833, per ACS 2024 5-year data.
Does my townhouse association take its roof rule from this guide?
No. Association covenants are separate documents. The Langley zoning summary allows only detached houses, so attached homes are outside that district's rule.
Nearby pages: metal roofs in McLean, where the Langley Fork guide itself is read closely, EPDM roofs in Falls Church and EPDM roofs in the City of Fairfax.
Official pages used
Checked October 12, 2026: HOD General Design Guidelines, January 2026; Langley Fork HOD Design Guidelines, January 2026; county historic overlay districts; county when a permit is required; Census Reporter, McLean; SPRI FAQ.
Talk through the next step
Tell us which slopes face the street
Give us the address, the building type and what covers the roof now. A short phone call sorts out which county office to ask before any membrane is chosen.
9220 Topaz St, Fairfax, VA 22031
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