Courtyard house walls are impressive structures, with massive granite stone blocks,and constructed with inner and outer faces. The space between was infilled with rubble and soil, in some cases to a thickness of two metres. There appears to be two possible methods of construction. The first method would be first to construct the interior walls. Taking Chysauster Hut 4 (See Fig. 2) as an example, the walls of the oval-shaped room, 4a, would be built next room 4b, to which was added 4c, the long sub-rectangular subdivided room. The overall oval shape of the building was retained throughout, a gap being left for an entrance into the courtyard followed by an anomalous sub-triangular area of stone. Following the line of the oval building a small circular room, 4d would be constructed the structure would be completed by building a wall linking 4d to 4a.
The walls would be possibly then built to a height of approximately six feet. Once this construction was complete the building of the outer walls would commence. This was carried out in an anti-clockwise direction commencing at the courtyard doorway. A double wall construction, later infilled with rubble, was achieved by leaving a three foot gap between inner and outer walls. The line of construction moved from 4c to 4b, too sharp an angle being avoided by leaving a large gap between the walls to be infilled later (Fig 2 b ). The wall line would continue to 4a, smoothing off any sharp angles in the process. As the wall continued round to the courtyard doorway, a rough oval would be created and the anomalous, sub-triangular infill, described earlier, created. With the double wall construction complete, an infill of rubble would create a strong support for the roof.
The second and less likely method used in wall construction started with the building of the exterior walls. Assuming that the objective of the builder was to build a large thick walled oval structure, building the outer walls first would be the most logical approach. However, when one looks at Hut 4 at Chysauster one immediately notices that the outer walls of this structure is not a perfect oval shape. There is a very definite bulge in the outer wall in at room 4b. This indicates that the first method described is the most likely to have been used. Viewing the outer wall construction in this light the rough bulging oval shape becomes the necessary result of smoothing off any angular exterior edges. Furthermore, the resulting large infills simply became the natural by-product of this construction method.
Applying this hypothesis to for example to Hut 6 (Fig 2) at Chysauster, the rounding off of external walls becomes more explicable. Hut 6 manifests a very detailed room plan which, if the initial construction of internal walls is accepted, explains the thickness of the infill. The infill between the walls of Hut 6 is very thick in places, particularly to the left of the entrance to the courtyard, also the area between 6a and the small store 6c.
The outer walls of this house are distinctly oval shape this can be seen clearly from aerial photography. The only visible exception being a bulge in the outer wall behind 6c, the possible store room. This emphasises the supposition that the building of the inner walls took place first, because the builder had to deviate from the overall smooth lines of the outer wall to accommodate the possible storeroom 6c.
A survey of other courtyard houses in the area adds weight to this theory of construction of the walls. On the next ridge to the West of Chysauster is the courtyard house settlement of Mulfra Vean. Here are two good examples that strengthen the theory. Courtyard house 1 has, it appears, two courtyard entrances, although this could be the result of a section of the outer walls having fallen in antiquity. The diagram (Fig 3a) indicates an oval room at the back of the courtyard, and what appears to have been two rooms in areas b and c, with a possible partition wall between them. The outer walls behind area b and c are good examples of this smoothing of the lines of outer walls. Additionally at Mulfta Vean the general oval line of the outer wall of Courtyard house 3 (Fig 4) is flawless, except where it has to loose its shape to accommodate room 3a.
Fig. 4
Another courtyard house settlement on the next ridge to the West near Lanyon, is Boswarva. At this site there are two examples of this possible construction practice. Courtyard house 2 (Fig 5) has a very simple outer contour, apart from the area behind room a. This is consistent with the plan at Mulfra Vean. House 3 at Boswarva (Fig 6) has a complicated interior wall plan, yet the outer wall is a simple oval. In consequence, this leaves two large infilled areas between rooms a and b and also between rooms b and c. the evidence suggests that logically the inner walls were constructed first. To construct the required size and type of room would be relatively simple. The outer walls could then be erected to supply strength, stability and insulation to the structure.
Figs. 5 & 6
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