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The Foundation:
The round house began with circular ditch and internal post ring. The ditch (approximately one to two feet deep) marked the house’s perimeter and provided drainage, preventing water from pooling against walls.
Inside this perimeter, substantial posts were erected—oak or ash, stripped but often not fully processed, driven deep into ground. These posts (typically eight to twelve, depending on house size) supported the roof’s weight.
The Walls:
The outer walls were not load-bearing (the roof’s weight rested on the inner post ring) but provided wind-break and insulation. They were constructed through various methods:
Wattle and daub: Woven hazel branches (wattle) plastered with clay, dung, and straw mixture (daub). This created solid, insulated walls that could be repaired easily.
Stone: In areas with abundant stone and little wood, drystone walls were built—stacked without mortar, creating sturdy barrier that lasted centuries.
Turf: Stacked sod blocks created insulated walls using the most renewable material, though turf walls required regular maintenance as the grass roots eventually died and the structure weakened.
The Roof:
The distinctive conical roof was thatched—the inner post ring supported a ring beam, from which rafters extended downward to meet the outer wall. The steep pitch (approaching 45-50 degrees) shed rain quickly, prevented snow accumulation, and created significant interior height.
The roof’s apex left open (or only partially closed) allowed smoke to escape—the gap was large enough for smoke exit but small enough to prevent excessive rain entry.
The Diameter:
Roundhouses varied from small (15-20 feet diameter, housing single family) to massive (50+ feet diameter, serving as communal halls). The average household roundhouse was probably 25-35 feet across—providing adequate space while remaining structurally feasible with available materials and techniques.
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