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EPDM roofing in Alexandria, VA: what the City papers say, and what a seam is
Twelve Alexandria documents were searched for the letters EPDM and found none. One names rubber membranes in a single sentence. So the City gives an owner almost nothing on this material, and the useful questions move to the seams, where a federal guide specification and the Virginia code say more. This page reads both sets of texts and ends with what to ask. Book a phone consultation to talk through an Alexandria EPDM roof.
- 0 of 12 City documents name EPDM
- 1 sentence in the BAR roofing chapter names rubber membranes
- 3 inch minimum seam width in the federal EPDM guide spec
What twelve City documents say about membranes
The City of Alexandria publishes its roofing rules for historic addresses as short chapters and policy sheets. For this page the roofing chapters, the administrative policies, the Parker-Gray reference guide, the application form, the skylight, solar, dormer and chimney chapters, the Permit Requirements page, the Historic Preservation page and a 2012 Code Administration memo were saved and searched. The one sentence that touches a rubber roof is this.
Later 20th-century roofing materials include fiberglass, rubber membranes, and imitation slate.
Roofing chapter, Old and Historic District, City of Alexandria (amended 07/16/2025)The Parker-Gray chapter carries the same sentence. The chapter also has a material chart with a photo captioned single ply membrane, dated to the 20th and 21st centuries. That is the whole of the City text on the material. It does not say which membrane, how it is attached, or how its seams are made.
| Document | What it says that touches a flat or membrane roof | Where it is silent |
|---|---|---|
| Roofing chapter (Old and Historic, Parker-Gray) | Names rubber membranes; says flat and low-sloped roofs are not reviewed by the Board; recommends light colors on flat roofs | Membrane type, attachment, seams, color shade, who judges the light color |
| Policies for Administrative Approval | A roof replacement row for slate, tile, metal, composition, synthetic slate and wood shingle; a flat roof mount rule for antennas | No row for a membrane roof at all |
| Parker-Gray Residential Reference Guide | Roofing material of 25 square feet or more goes to staff; under 25 needs no review | The row names no material |
| Skylights chapter | Flat-profile skylights on flat and low-sloped roofs count as not visible | Curb and membrane flashing around the skylight |
| Permit Requirements page | Two categories, residential and commercial; three or more dwelling units is commercial | The word roof does not appear |
Sources: City of Alexandria chapters and policy sheets, amended July and September 2025; Permit Requirements page updated April 3, 2026. Opened October 18 and 20, 2026.
Silence is a finding here. A City page that does not mention a membrane does not approve one, and it does not rule one out. For the district question itself, the Alexandria roofing guide lays out the three paths.
Permit rules that reach a flat roof
State exemption
Section 13VAC5-63-80 exempts replacement of an unlimited amount of roof covering in R-3, R-4 and R-5 buildings unless the nominal design wind speed is over 100 miles an hour, and replacement of 100 square feet or less in every group.
A 2012 City memo
Code Administration wrote that a permit application is required for replacement roofing in a historic district designated under Virginia law, naming Parker Gray and Old Town. It rests on the 2009 code, so treat it as a pointer, not current text.
Larger buildings
The City sorts three or more dwelling units as commercial, and many flat roofs sit on such buildings. The state exemption for unlimited replacement is written for R-3, R-4 and R-5 only, so ask Code Administration which group your building is.
The City's application form adds that, after Board approval, any required permit comes from Code Administration.
Splice tape or seam adhesive
An EPDM roof is made of rubber sheets joined at the edges, and the joint is where the sheet is no longer one piece. The EPDM Roofing Association, which speaks for the manufacturers, says EPDM comes in larger sheets than other single-ply options, which it says means fewer seams. Its installation page gives panel sizes up to 30 by 100 feet for an adhered roof and up to 50 by 200 feet for a ballasted one. Fewer seams is a manufacturer-side claim, so ask what the quote assumes for this roof.
The best public text on how a seam is made is a federal one: Unified Facilities Guide Specification 07 53 23, the August 2025 edition prepared by NAVFAC for government projects. It does not bind a private roof. It does show two methods side by side.
Seam tape
A double-sided synthetic rubber strip, at least 0.03 inch thick and 3 inches wide, set between primed sheets. Along a line where the sheet is mechanically fastened, the specification calls for 6 inch tape. The specification note says tape has proven most effective at keeping the long-term seal of field seams.
The note makes tape the primary technique for the field of the roof.
Seam adhesive
A brushed synthetic rubber adhesive on both mating surfaces, followed by an in-seam sealant bead and a lap sealant over the edge. The specification restricts it to flashing areas where tape is hard to apply, and field-of-roof adhesive seams need Government approval.
It has more steps to get right, because the adhesive must set to a field-check condition before the sheets close.
That is one specification for one owner. A private owner may be offered either method and the manufacturer instructions for the chosen system decide which is allowed. What the specification shows is that the choice is a written item, not a detail left to the crew.
How a taped seam is closed, and when it is checked
- Sheets relax. The guide specification has the rolled-out sheet rest at least 30 minutes before seaming, with the lap not less than 3 inches in any case.
- Surfaces are cleaned and primed. The tape goes on only after the primer sets as the manufacturer instructs.
- Tape goes on the lower sheet and is rolled. A hand roller gives full contact. Tape end laps are at least 1 inch.
- The top sheet is laid, the release paper is pulled and the seam closes. The closed seam is rolled across its width, then along its length.
- T-joints get a patch. Where three sheet edges meet, the specification adds a strip of membrane-backed flashing tape at least 9 inches long.
- Seams are checked and the day is closed out. The inspection list says seams are hand rolled and all seams are checked at the end of each workday. A manufacturer representative visits at least three times, once within the first 20 squares and once at substantial completion, and signs a report.
The adhesive sequence adds a wet film of about 0.025 to 0.030 inch on both sheets, a manufacturer field check before closing, a bead of in-seam sealant, and, after a minimum of 2 hours, a cleaned lap edge with lap sealant feathered over it. Where a sheet is mechanically fastened, the guide keeps at least 3 inches of seam beyond the plate or batten edge.
Which text covers which question
Virginia code. Section 1507.12 of the commercial chapter on roof assemblies has three parts: a design slope of at least 1/4 inch in 12, a material standard table that lists EPDM under ASTM D4637, and a rule for ballasted low-slope roofs. It names no seam method. The text was read on the UpCodes copy of the Virginia edition, so confirm it with Code Administration.
ASTM D4637. The standard the code cites for the EPDM sheet. Its text is sold by the publisher and was not opened for this page, so it is cited only as the table entry.
Federal guide specification. UFGS 07 53 23 is where the seam steps above come from. It is a model for government work, written with options and notes, not a rule for a private building.
Manufacturer instructions. Both the code and the guide specification defer to them for the lap, the tape or adhesive and the sealants. Ask for the instruction sheet for the system named in the quote.
The general EPDM page, EPDM roofing, covers the material itself, and the materials overview sets it beside the other flat roof options. The flat roof page covers drainage and ponding.
What a seam line in a scope should say
- Are field seams made with splice tape or with seam adhesive, and is the choice written down?
- What seam width and lap does the quote use, and does it match the instruction sheet for the system named?
- If adhesive: which primer, in-seam sealant and lap sealant, and is the manufacturer field check part of the work?
- How are T-joints and flashing seams handled, since those are the places the guide specification treats separately?
- Are seams rolled and checked at the end of each workday, and who writes that down?
- Does anyone from the membrane manufacturer visit and report, or does the crew alone judge its seams?
- Is the address in Old and Historic Alexandria, Parker-Gray or neither, and has staff said whether visible work needs review?
- Is the building residential or commercial in the City sorting, and does a permit apply?
Book a phone consultation to talk through an Alexandria EPDM roof. Have the street address, the building type and photographs of the roof surface and seams ready. See also commercial roofing and roof replacement, and the Alexandria hub for the City path.
References, with the dates they were opened
- City of Alexandria, Roofing chapter, Old and Historic District, amended 07/16/2025, opened October 20, 2026.
- City of Alexandria, BAR Policies for Administrative Approval, amended 09/24/2025, opened October 20, 2026.
- City of Alexandria, Parker-Gray Residential Reference Guide, opened October 20, 2026.
- City of Alexandria, Permit Requirements, updated April 3, 2026, opened October 20, 2026.
- 13VAC5-63-80, Virginia Administrative Code, opened October 20, 2026.
- Virginia Construction Code 2021, chapter 15, UpCodes copy, opened October 20, 2026.
- UFGS 07 53 23, Ethylene-Propylene-Diene-Monomer Roofing, August 2025, opened October 20, 2026.
- EPDM Roofing Association, installation methods and Technical Bulletin 101, opened October 20, 2026. A manufacturers association, so read as industry text.
This page reports what the documents say. For the permit path ask Alexandria Code Administration and preservation staff; for the seam method ask the membrane manufacturer and your engineer.
Questions people ask
Does Alexandria say anything about EPDM roofs?
Not by name. The Board of Architectural Review roofing chapter says later 20th-century materials include rubber membranes, and its material chart has a single-ply membrane photo. No City document searched for this page uses the letters EPDM.
Is a flat EPDM roof reviewed by the Board of Architectural Review?
The roofing chapter says flat and low-sloped roofs, because of their limited visibility, are not reviewed by the Board. Staff review still covers visible replacement roofing, and staff judge visibility on a visit, so ask preservation staff before you sign.
Do I need a building permit to recover or replace an EPDM roof in Alexandria?
The state exemption list covers unlimited replacement of roof covering in R-3, R-4 and R-5 buildings below a wind speed limit, and 100 square feet or less in any group. A local historic district can change that, so confirm with Code Administration.
What is the difference between seam tape and seam adhesive?
Tape is a double-sided rubber strip set between two primed sheets. Adhesive is brushed on both sheets, and then a sealant goes on the lap edge. The federal guide specification makes tape the primary method and treats adhesive seams in the field of the roof as an exception.
Does the Virginia code say how EPDM seams must be made?
The single-ply section, 1507.12 in the commercial code, names the sheet standard (ASTM D4637 for EPDM), a minimum slope and the ballast rule. It has no seam method. The manufacturer instructions govern the seams, so the code points the question elsewhere.
Can I read the federal EPDM specification myself?
Yes. UFGS 07 53 23 is a public guide specification written for government projects. It does not bind a private roof, but it shows what a detailed seam section contains, so it is a useful checklist for your own scope.
What should I ask about seams before accepting an EPDM quote?
Ask whether field seams are tape or adhesive, which width and which lap the quote uses, whether seams are rolled and checked each day, and who confirms the work against the manufacturer instructions. Write the answers into the scope.
Talk through your roof with Roofers of Arlington
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