Pasadena, Los Angeles County,
This precast stone restoration project for the historic headquarters of Carnegie Observatories in Pasadena followed an earlier restoration in the 80s, which left the stone vulnerable to damage. High-pressure water cleaning had scoured the original cement surface and left the cast stone trim more absorbent and prone to deterioration when exposed to moisture. Application of special rendering compounds stabilized these surfaces and made them much more resistant to weathering.
Click on images below to enlarge.