South Portico vestibule James Hoban devised for the 1824 addition. (White House History Number 29)
Located beneath the South Portico, this vestibule most clearly illustrates the system of vaulting James Hoban devised for the 1824 addition. The groined arch forming the ceiling of the vestibule makes the tall doors possible by redirecting the weight borne by a low-slung barrel vault that supports the heavy stone floor of the semi-circular South Portico above.
- Medium
- Photo
- Credit
- Jack E. Boucher, Historic America Buildings Survey