* You must [[repairing|repair]] any [[damage]] on the oriels with a [[slate brick]] before [[improve|improving]] it.
* Activate a slate brick, right-click the oriel and select ''Repair'' or ''Improve''.
* The effective [[quality]] of the slate brick is affected by its damage and your [[masonry]] skill, ; it must be higher than the oriel's current quality.
== See also ==