Opus incertum
ancient Roman construction technique
Opus incertum ("irregular work") was an ancient Roman construction technique, using irregularly shaped and randomly placed uncut stones or fist-sized tuff blocks inserted in a core of opus caementicium.
Initially it consisted of more careful placement of the caementa (rock fragments and small stones mixed with concrete), making the external surface as plain as possible. Later the external surface became plainer still by reducing the amount of concrete and choosing more regular small stones. When the amount of concrete between stones is particularly reduced, it is defined as opus quasi reticulatum. Used from the beginning of the 2nd century BC until the mid-1st century BC, it was later largely superseded by opus reticulatum.
Vitruvius, in De architectura (Ten Books on Architecture), favours opus incertum, deriding opus reticulatum as more expensive and structurally inferior, since cracks propagate more easily.
The public source identifies “Opus incertum” as ancient Roman construction technique. This brief keeps that definition visible, then builds a research path around Opus, incertum and ancient.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Opus incertum”, the useful work is to connect “ancient Roman construction technique” to the records capable of establishing context and consequence.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Apr 13, 2026. The linked authority identifier is Q1326603. None of the 0 selected statements returned an explicit reference.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Opus incertum”, its source revision and the description used here.
- Expand the search: follow Opus incertum primary sources, Opus incertum archive and Opus research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Opus incertum”?
- What terminology or title could unlock a more precise catalogue search?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Opus incertum” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.