What is a palm vault?
A palm vault is a rib vault in which the ribs radiate in all directions from a single freestanding, load-bearing column. The image of a trunk topped by a crown of spreading fronds gives the vault its name. Structurally it is a form of fan vault, but developed all round one support rather than against a wall.
How it works
In an ordinary quadripartite rib vault the ribs meet from four corner points and the load is carried to four supports. In a palm vault it works the other way round: from one column the ribs spring upwards in a circle and then meet the surrounding vault cells or the ribs of the neighbouring column.
Consequences for the structure:
- The column carries far more than in a normal bay system, because all the surrounding vault cells land on it.
- The ribs largely balance each other’s thrust, since they stand in radial equilibrium.
- The space reads as open: fewer supports are needed for the same vaulted area.
Where you see it
The palm vault belongs to the late Gothic, when master masons began treating the rib structure as a decorative network rather than a purely structural skeleton. Well-known examples include the vault in the ambulatory of Saint-Séverin in Paris (around 1450) and the celebrated “palmier” in the church of the Dominican convent in Toulouse.
The motif returns much later in nineteenth- and twentieth-century construction, when cast-iron or concrete columns with flared heads create the same image — the mushroom column is in effect its matter-of-fact descendant.
Related vault forms
- Fan vault: ribs fan out from the wall springing; typical of English late Gothic.
- Funnel vault: the springing rises from a single point in a funnel shape.
- Net vault: the ribs form a dense diamond pattern with no clear fan structure.
Related terms
- Vault
- Vault rib
- Quadripartite rib vault
- Column
- Mushroom column
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