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Metal roofs in Washington, DC: what the historic guidelines name and what they leave out
Search the District's historic preservation documents for standing seam, pressed metal, copper or terne and the list is short. The Office of Planning guideline Roofs on Historic Buildings gives metal one page and a footnote, and eight district design guidelines add sentences of their own, some more welcoming to metal than others. This page quotes each wording briefly and marks the gaps. It reads documents and does not rule on your address.
- Standing seam appears once in the roof guideline, in a footnote
- 4 of 8 district guidelines name metal for roofs hidden from the street
- No gauge, slope or fastener detail for metal in the guideline
What the roof guideline says about metal
The Office of Planning guideline sets out roof shapes, parts and materials, then how each deteriorates and what to do about it. Metal gets its own entry under materials, and shows up again in cornices, copings, gutters and the substitute table. Taken together, these are the statements that bear on a metal roof.
- Metals named
- Copper, lead and terne plate, which the guideline calls common in the nineteenth century, with zinc and galvanized steel added for sloping roofs in the early twentieth.
- What sets the look
- Three things: the type of metal, how it is finished and how the sections are joined.
- Finish
- Copper is usually left unpainted and weathers to a green patina; lead weathers to a soft gray. The rest are painted.
- Joints
- Flat-seam, with a flat and uniform appearance, or raised-seam, with a ribbed one. A footnote adds that raised-seam is also called standing-seam.
- Shingles
- Decorative metal roof shingles of varying shapes, sizes and textures may be found on late nineteenth and early twentieth century buildings.
- At the edges
- Cornices may carry sheets of tin, zinc or other metal; copings may be metal; gutters were copper, galvanized steel, terne plate or lead.
- Repair ladder
- Light corrosion: wire brush and repaint. Heavier damage: replace sections with the same type of metal. Extensive damage: replace the whole membrane.
All other types of metal roofing are painted to resist corrosion.
Office of Planning, Roofs on Historic Buildings, Roof Materials: MetalThe last rung carries the weight: the whole membrane "should be replaced by a metal roof that duplicates the character of the existing". The guideline does not say how closely, or how a reviewer measures it.
Terms you will hear, and where each appears
Trade words and document words do not always match. This table follows each term through the roof guideline and the eight district guidelines.
| Term | Roofs on Historic Buildings | Eight district guidelines |
|---|---|---|
| Standing seam | Once, in a footnote, as another name for raised-seam | Not used |
| Pressed metal | Not used; says decorative metal roof shingles | Anacostia: pressed-metal shingles listed as an original covering |
| Copper | Unpainted and weathering green; gutters; flashing and gutter substitutes | Meridian Hill: cornices, balconies, gutters, downspouts, porch roofs and cresting |
| Terne plate or tin | A footnote calls a terne plate roof a tin roof; named among painted metals | Terne not used; Anacostia mentions tin only for cornice sheets |
| Lead-coated copper | Not named; copper and lead appear separately | Not named |
| Sheet metal | Appears for finials, not as a roof term | Anacostia: sheet metal roofing and cornices; Old West End: only in its glossary entry for flashing |
| Aluminum | Listed only as a substitute | Anacostia, Bloomingdale and Kingman Park mention it for other building parts |
Texts searched by the author on October 19, 2026, from the Office of Planning's PDFs. Table cells report words, not policy.
Two rows matter for a quote. A proposal that says standing seam matches the guideline's raised-seam. One that says lead-coated copper has no description to compare with, so ask the Historic Preservation Office how it reads that product.
Eight district guidelines, one question
The Historic Preservation Review Board has adopted guidelines for particular districts. Eight were read for one question: what may a roof become when the street cannot see it, and what must it match when the street can?
Roofs hidden from the street
- Bloomingdale. Section 2.3 says flat and sloping rowhouse roofs not visible from the street "can be replaced with metal, membrane or other materials".
- Kingman Park and Emerald Street. Kingman Park says the flat portion of roofs not visible from the street can be replaced with metal, membrane or other materials, and adds that green roofs are allowed. Emerald Street says its roofs, which are not visible from the street, can be replaced with the same three options.
- Anacostia. For flat or gently sloping roofs concealed behind parapets and pent roofs, the text says "sheet metal roofing is acceptable" beside membrane and built-up types.
- Old West End. Non-visible flat roofs may be replaced in kind or in alternative materials. Metal is named only in the district's character notes.
- Foxhall Village and Meridian Hill. Roofing not visible from a street can be replaced in kind or with an alternative material; neither names metal.
Roofs the street can see
- Anacostia. Sheet metal, slate and wood shingles are the original coverings, and the district calls them the most compatible and preferred. The text lists "pressed-metal shingles" among them.
- Meridian Hill. A visible replacement should match the original's material, color, texture, size, finish and profiles. Copper is described on the district's cornices, gutters, porch roofs and cresting.
- Bloomingdale and Kingman Park. Turrets, pent roofs and decorative finishes should replicate the original's appearance. Bloomingdale encourages the original material but says it may not be required; Kingman Park encourages slate in kind and allows synthetic slate or asphalt shingles.
The Office of Planning page for Bloomingdale is titled as draft guidelines and says the Review Board approved the draft on October 22, 2020. Ask whether that wording is the one applied today.
These texts apply only inside the districts they name, under the permit and review path in the Washington, DC roofing guide.
When the metal itself changes
Here the guideline is most specific. Its order runs: maintain the existing material, repair deteriorated areas in kind, replace the whole material in kind, and only then use a substitute. Owners are told to weigh the substitute's expansion, contraction and weathering, and the text warns that it may react chemically with adjacent historic materials.
The guideline's own examples of a substitute for an old metal roof are aluminum, and synthetic slate where slate was the historic covering. It also lists aluminum for flashing and gutters, and fiberglass for metal at the eaves, cornice and parapet. The text version of the table does not show which substitute pairs with which historic metal on the sloping-roof row, so read the printed table, then ask.
The table does not list metal replacing slate or shingle. The slate roof guide shows how Arlington's documents treat slate; for the District, ask the Historic Preservation Office.
Where the documents are silent
Gauge and finish
The roof guideline names painted metal and unpainted copper and lead, and nothing finer.
Slope
No minimum slope for any metal roof. The word slope covers roof shape and the placing of skylights and solar.
Fastening
No fastener, clip, nail or solder detail appears.
Service life
Age figures are given for slate, asphalt shingle and built-up roofing, and none for metal.
Metal over old roofing
The words overlay and recover do not appear.
Judging visibility
The roof deck handout describes a flag test: the edges of proposed work are marked and staff walk the block to check sight lines. It names decks, additions, solar and mechanical equipment, not roof coverings.
Roofing and metalwork both sit on the Office of Planning's list of work staff can clear quickly when it is in kind or compatible. Staff review against adopted guidelines, and work found inconsistent goes to the Review Board. The Old West End guideline tells owners that repair should be consistent with Roofs on Historic Buildings.
Although originally clad in metal, their material is not generally a character-defining feature
George Washington University/Old West End guidelines, rowhouse features (published June 2018)That sentence about gently sloped main roofs applies to that district and those roofs only, not to a pent roof, a cornice or a roof the street can see.
Reading a metal scope against the documents
- Find the governing document. Confirm with the Historic Preservation Office whether the address sits in a district, and which guideline text applies: the general roof guideline, or one of the adopted district guidelines.
- Sort the roof into hidden and visible parts. Flat roofs behind a cornice or parapet, pent roofs, turrets and dormer roofs fall on different sides of the line in the district texts.
- Name the existing metal. Copper, lead, terne plate, zinc, galvanized steel and decorative shingles each carry a different guideline sentence. A scope that says only metal roof gives nothing to review.
- Name the proposed metal, finish and seam. The guideline says these three decide a metal roof's appearance, so a scope should state each one.
- List flashing, gutters and edge metal separately. The substitute table treats them as their own rows.
- The scope says whether each part of the roof is in kind, compatible or a substitute.
- A substitute, if any, is named, with a note that the Historic Preservation Office was consulted.
- Technical points the guideline leaves out, such as slope, fastening and thickness, are written into the quote from the manufacturer's instructions.
Book a phone consultation to talk through a Washington, DC metal roof; the call starts with the address, the building type and what can be seen from the street. For the District's permit path and the rowhouse flat-roof rules, read the Washington, DC guide. See the metal roofing page, flat roof page, roof replacement page, materials and services, or book a phone consultation and call (571) 397-6072. The Arlington County roofing guide shows a county permit table for comparison; service areas lists nearby places.
Where each claim here was read
Opened October 19, 2026. The roof guideline carries no date, and its closing credit names the Historic Preservation Division and the Department of Consumer and Regulatory Affairs, older agency names, so treat it as current only as far as the Office of Planning page that links it does.
- Office of Planning: Roofs on Historic Buildings (PDF guideline)
- Office of Planning: Design Guidelines and Historic District Guidelines
- HPO Expedited Review and Work Qualifying for HPO Review
- Roof Decks and Roof Additions (PDF handout)
- District guidelines: Anacostia, Bloomingdale, Colony Hill, Emerald Street, Foxhall Village, Kingman Park, Meridian Hill, George Washington University/Old West End
Questions people ask
Does the DC roof guideline allow a metal roof on a historic rowhouse?
The guideline treats metal as a historic sloping-roof material and asks that a badly deteriorated metal roof be replaced by one that duplicates the character of the existing. It states no rule for putting metal on a roof that never had it, so ask the Historic Preservation Office.
What does the DC guideline say about standing-seam metal?
It uses the phrase once. The guideline names two joints, flat-seam and raised-seam, and a footnote says raised-seam is also called standing-seam. Flat-seam gives a flat, uniform appearance; raised-seam gives a ribbed one.
Are pressed metal and tin roofs mentioned in the DC guidelines?
A footnote in the roof guideline says a terne plate roof is commonly called a tin roof. The phrase pressed metal is not in that guideline, which refers to decorative metal roof shingles instead. The Anacostia district guideline does name pressed-metal shingles, among the original roof coverings it lists for that neighborhood.
Can I replace a copper or terne roof with aluminum in a DC historic district?
The guideline lists aluminum as a possible substitute for the sloping-roof metals and for copper, lead and galvanized steel flashing, but only after maintenance, in-kind repair and in-kind replacement have been ruled out as not technically or economically feasible. It tells owners to consult the Historic Preservation Division before using a substitute.
Which DC district guidelines say a hidden roof can be metal?
Anacostia, Bloomingdale, Emerald Street and Kingman Park name metal. Anacostia says sheet metal roofing is acceptable behind parapets and pent roofs; the other three say roofs not visible from the street can be replaced with metal, membrane or other materials.
Does the DC guideline say how long a metal roof lasts or what gauge to use?
No. A text search of the guideline finds no gauge, thickness, minimum slope, fastener or solder detail for metal, and it gives age figures for slate, asphalt shingle and built-up roofing but none for metal. Put them in the written scope.
What if my block is not in a district with its own guideline?
Then the general roof guideline is the written reference. Capitol Hill, Cleveland Park, Massachusetts Avenue, Mount Pleasant and Woodley Park have community-written guidelines that the Office of Planning says the Review Board has not officially adopted. Ask the Historic Preservation Office which document it applies to your address.
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.