Jacales
The jacal has a simple design but one of extraordinary flexibility, which allowed for an adaptation of construction techniques in response to the variety of conditions faced by the Spanish and French across the great width and breadth of Texas. Jacal is the Spanish adaptation of the Nahuatl word xahcalli, which described the domestic dwellings of the native people of Central Mexico. Jacales were introduced to East Texas by the Spanish and would have been built at Mission Dolores during its 1721-1773 occupation.
The best feature of the jacal was that it could be built with limited construction knowledge using a variety of materials and with very few tools. It could also be built quickly but could last for a very long time if built properly and periodically maintained. Using natural building materials readily at hand, the jacal could also be built inexpensively. Plus, the jacal could be modified or added to with little effect or damage to the original structure. No wonder it was such a popular building style!
The basic shape for the jacal was a single room of rectilinear layout. Postcard image from the early 20th century give good visual examples of the basic jacal framing. In most cases, the room was covered with a gable roof frame. Thus structurally, the center of the narrower end walls would have the tallest pole columns – usually with a ‘Y’ of a branch at its top – placed in the center of the wall line. A long ridge pole would be placed in the notch of this branch ‘Y’, forming the peak of the roof. Posts of lesser heights would then be placed at each corner of the room, with additional beam poles placed at the top of the posts to form the low side of the roofline.
Posts were also placed at each side of any door or window opening for stability. In most cases, the posts were placed into shallow holes especially dug for each post. In the case of palisado wall construction, a trench was dug along the length of the wall to support the ends of the vertical posts placed next to each other to create a complete wall.
Archeologists look for signs of both of these conditions during excavations, revealed as post molds or wall trenches marked by soil patterns with a different and usually darker color or matrix. In some cases, these trenches or post molds can also include cultural material (daub, charcoal, pottery sherds) which can date or clarify occupation phases related to the structure.
The space between vertical posts was filled with small rocks and mud or lime chinking. Smaller, thinner branches would sometimes be placed vertically between the framing pieces. These branches would also be placed horizontally. Such methods created very substantial walls which would be finished with another coat of daub, sometimes with a final a plaster coat on the more refined jacales. Aligned rocks possibly used as chinking or fill material in an exterior wall have been observed in archaeological excavations at Mission Dolores. Sometimes these infilled walls would simply be finished out with palm fronds or with grasses similar to the roof construction. And sometimes the rooms were simply open air and had no walls.
As is known from comparable 18th century Spanish missions, it is likely that the church at Mission Dolores may have been a more substantial structure than the simple jacales that would have been residences for the priests, the two soldiers, and their families. The church at Mission San Sabá appears to have been the most substantial building in the complex, surrounded by what appear to be jacal type structures. The structures depicted on the Los Adaes map which are located inside the presidio appear to have dressed lumber frames and a smooth external appearance, while the houses surrounding the presidio are described in 1768 as by Pierre Marie François de Pagès, a French visitor, as “. . . around forty miserable houses, constructed with stakes driven into the ground.” Pagès stayed in one of these houses and describes is as follows, “I went to sleep in the corner of his house, which by the bye, scarcely deserved that name, for the roof was only supported by a sort of paling, the greatest part of which had fallen to the ground from negligence and length of time.”
The houses at Los Adaes described by Pagès were undoubtedly jacales, and this type of structure would also have been present at Mission Dolores. Given the fact that Pagès described the houses at Los Adaes as consisting of vertical posts stuck in the ground, it is likely that these jacales were the palisado variety. At least one small structure identified during the archaeological investigations at Mission Dolores on the basis of post holes and wall trenches appears to be a palisado. The large pits filled with refuse excavated at Mission Dolores originally may well have been pits resulting from digging clay for making adobe blocks and for covering the jacal structures.
The same Spanish expedition that built the church and priest’s residence at Mission Dolores in 1721 also built the same structures at Los Adaes, so it is likely that the building style is similar, if not identical. Unfortunately, we have no surviving documents with precise descriptions of the mission church at Mission Dolores. All that can be concluded with confidence is that the structure was made of wood and not stone. Urrutia's drawing of the Los Adaes mission complex shows a church and priest’s residence forming part of the compound wall, which appears to be a type of wooden fence. The simulation model for Mission Dolores also uses the walls of one of the structures as part of the compound walls based on Corbin’s discovery of the traces of a wall trench and adobe block building. The roofs of the buildings at Los Adaes are described as wood shingle roofs. Pagès also passed through Mission Dolores, but he makes no mention of what he saw, possibly because there wasn’t anything much different than what he had seen at Los Adaes.
Mission Dolores Simulation Design
Wolf has designed a wonderful plan for a simulation at the Mission Dolores Museum and Visitors Center. This simulation includes a mission complex, agricultural fields, and an Ais village. The first thing that entering visitors will see is the Ais village, followed by the agricultural field and then mission complex. Wolf has proposed that the major architectural elements—the poles of the buildings—be constructed of lightweight cast concrete and that the roofs and infilling be authentic material. The art of casting lightweight concrete to simulate wooden frameworks has been perfected by Carlos Cortes, a descendent of an artist who made concrete castings of wooden objects in the 1920s that are still on display today in San Antonio at the Palace of the Governors and at one of the missions. The overall simulation will provide a visual rendering showing of the relationship of the Spanish, the Ais, and the land.
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Jacal type structure showing palisade style construction with rock chinking and mud infilling overlain by horizontal lathing and finally plastered on the exterior. As the walls have deteriorated, the rock chinking is deposited along the wall lines. SFA Archaeological Laboratory. |
Excavation exposure at Mission Dolores of a linear stain pattern running through the center of the photo (bottom to top) of slightly darker color with occasional postmolds and rocks. This feature (Feature 25) is interpreted as the likely perimeter wall of the mission compound. SFA Archaeological Laboratory. |
Early 20th century photo of a substantial jacal residence in Matamoros, Mexico with vertical grilles covering window openings. The typical structure has smaller branch infill palisado walls covered with daub (note the replastering of the wall at one window). Horizontal strips provide additional wall stability. Also note the extended roof framing members and the overhang of the gable thatch roof. The door is located in the end wall. |
Early 20th century colorized postcard showing a domestic compound near Harlingen, Texas. Clearly visible are two jacales with three abutting ramadas, or open-wall shade awnings. Both jacales have horizontal branch infill walls, doors in the end walls, and grass thatch roofing. |
Early 20th century postcard photo taken in Tamaulipas, Mexico of a typical jacal with apparent palm frond roofing and wall finish. Note that the door is centered in the long wall. |
Preliminary plan of the proposed simulation of Mission Dolores de los Ais by San Antonio architect Mark Wolf. The simulation depicts an Ais village, agricultural fields, and mission complex, all along the Ayish Bayou. |
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