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House of the Wooden Sacellum (Casa del tramezzo di legno) (Herculaneum)

The House of the Wooden Sacellum (Casa del Tramezzo di Legno), also known as the House of the Wooden Partition, is a well-preserved ancient Roman patrician residence located at Insula III.11 in Herculaneum (modern Ercolano, Italy), buried under pyroclastic flows from the eruption of Mount Vesuvius in 79 CE. Positioned on the east side of Cardo IV Inferiore, a major north-south street, it originally spanned the entire insula but was later subdivided, with some rooms converted into humble artisan dwellings and shops, reflecting economic or social adaptations possibly after the 62 CE earthquake. Dating to the late Republican period (1st century BCE), it was remodeled in the 1st century CE, blending Samnite structural elements with Roman decorative refinements. The house derives its name from a remarkably preserved carbonized wooden partition (tramezzo di legno)—a folding screen with hinged panels and bronze fittings—separating the atrium from the tablinum, a rare surviving example of Roman carpentry that still functions, allowing for privacy during business or family gatherings. This feature, along with a wooden bed and table, highlights Herculaneum's superior organic preservation compared to Pompeii. Likely owned by a person of means, perhaps involved in trade, the house exemplifies mid-level elite urban living in a seaside resort town.

Excavation history began with 18th-century Bourbon tunnel explorations, which caused minor damage, but systematic open-air digs occurred between 1928 and 1929 under archaeologist Amedeo Maiuri, who noted its patrician character and preserved façade. The mudflow burial carbonized wood at temperatures around 300–500°C, preserving details absent elsewhere, though early interventions warped some elements. As part of the Parco Archeologico di Ercolano (€13 entry, open 8:30 AM–7:00 PM), it is accessible to visitors, who often highlight the partition's ingenuity and frescoes in reviews, though the site's fragility limits upper-floor access.

Overall Layout and Architectural Features

The house occupies a narrow rectangular plot (ca. 200–250 square meters) constrained by urban density, oriented north-south for light from Cardo IV. The layout follows a simplified Tuscan atrium plan: entry via a fauces (corridor) leads to a central atrium with an impluvium, flanked by cubicula and alae, culminating in a tablinum screened by the wooden partition. To the west, a corridor connects to a peristyle garden with porticoes, providing ventilation and privacy. The design emphasizes axial progression—fauces → atrium → tablinum → peristyle—prioritizing family over public display, unlike grander villas.
Architecturally, it features opus reticulatum walls with tufa thresholds and jambs (Samnite legacy), a compluvium (roof opening) for light/rain into the marble-lined impluvium, and multi-story opus craticium (timber-framed) construction with beam holes for upper galleries. The façade, one of the best-preserved in Herculaneum or Pompeii, rises to the second storey with a portal, windows, and small lights, including masonry benches outside. The wooden partition—charred panels with central hinged doors, bronze lamp supports (ship's stern-shaped), and still-operational hinges—allowed the owner to observe clients without direct exposure. Drainage via puteals fed cisterns, and post-62 CE reinforcements closed some openings for stability. The upper floor, accessed separately post-subdivision, included rented rooms, indicating adaptive reuse.

Room-by-Room Description

The house comprises 12–15 ground-floor spaces and upper rooms, labeled per Maiuri's plans; the western peristyle section is partially detached.

Entrance Fauces (Room 1): Narrow corridor (ca. 3x1.5m) from Cardo IV, with painted walls (south/north) in faded Fourth-Style motifs; tufa threshold; branches east to atrium, west to Room 3.
Room 3 (Cubiculum/Storeroom): South of fauces (ca. 2x2m); south wall recess for storage, upper west wall arched niche (possible lamp holder), beam holes for upper flooring; utilitarian with minimal decor.
Atrium (Room 6): Central Tuscan space (ca. 5x4m) with compluvium and impluvium (opus signinum basin with white tiling pattern, later marble-covered); four low masonry pillars support a wooden gallery (partially reconstructed); doorways to Rooms 2, 4, 5, 7, 8, and west corridor (10). Upper walls feature painted masks; near impluvium, a marble table (ca. 1m high) with intricately carved legs (dog or griffin motifs) for offerings or display.
Room 2 (Cubiculum): Northeast of atrium (ca. 3x2m), adjacent to fauces; simple bedroom with flooring remnants and ceiling details; possible bed recess.
Room 4 (Cubiculum): South side of atrium (ca. 3x2m); east wall plants on red zoccolo (lower band), upper south wall frieze with deer panel; lit by small window.
Room 5 (Cubiculum): Southwest of atrium (ca. 3x2m); carbonized wooden bed frame in southwest corner (one of few preserved); upper wall engraving from 1757 Bourbon dig; private sleeping quarters.
Room 7 (Ala/Wing): South side of atrium (ca. 2x2m); open alcove for display; painted west/south/east walls in geometric patterns.
Room 8 (Triclinium/Dining Room): Southwest of atrium (ca. 4x3m); doorways to atrium and east portico; Fourth-Style frescoes with sea-monsters, dolphins, phoenix, goat, grapes, and sacred scenes on red/black grounds; suitable for reclining meals.
Tablinum (Room 9): Rear of atrium (ca. 4x3m), screened by wooden partition; owner's study for business; black/white mosaic floor with diamond motifs around central copper tile; views to peristyle.
Corridor (Room 10): West of atrium (ca. 2x4m); leads to peristyle; north wall doorway to Room 12; utilitarian passage.
Peristyle Garden (11): West end (ca. 6x5m); colonnaded on east/north sides (tufa columns); south wall garden painting with foliage/figures; central greenspace for leisure.
Room 12 (Oecus/Reception): North wall of peristyle (ca. 3x3m); plaster decorations; doorway from corridor.
Rooms 13–17 (Peristyle Wings): North/west sides; doorways/windows (e.g., Room 13 north wall, Room 14/15 west); Room 16 (central west) deteriorated frescoes; Room 17 northwest corner doorway; small cubicula/oeci.
Upper Floor: Accessed via separate entrance (post-subdivision); gallery with railings; multiple rooms (e.g., above Room 3) for tenants; statuette of Attis found here.

Decorations, Artifacts, and Significance

Decorations blend Third/Fourth Pompeian Styles: fauces in First-Style marble imitation (vivid earth tones); atrium upper walls with masks; Room 4 plants/deer frieze; Room 8 mythical sea scenes; peristyle south wall garden illusion. Floors: opus signinum (atrium/impluvium), black/white mosaics (tablinum with diamonds/copper), red/white (cubicula).
Artifacts: Wooden partition (charred, functional hinges/bronze fittings); carbonized bed (Room 5); marble table (atrium, carved legs); Attis statuette (upper floor); wooden leaves/bronze lamps. Bourbon digs yielded 1757 engravings.
The house's significance lies in its preserved façade (up to second storey, rare in Vesuvius sites) and wooden elements, illuminating Roman carpentry, privacy mechanisms, and post-earthquake adaptations (subdivision for income). It exemplifies patrician decline into multi-use, contrasting grander villas, and highlights Herculaneum's organic preservation for daily life studies.