SGH provided building enclosure consulting services for the reinforced concrete structure featuring cast concrete decorative elements and distinctive components, such as the 85 ft dia. copper-clad planetarium dome and cupola, coelostat, and telescope domes. Although the building was in generally good condition, it suffered from leakage and some of the waterproofing systems had exceeded their useful life. Highlights of SGH’s work the following:
Investigated exterior walls, copper-domed roofs, roof deck and stairs, planetarium promenade, interior marble flooring, and travertine panels
Used a 125 ft boom lift to examine and water test the planetarium dome
Designed and observed installation of mockups for paint removal, concrete repair, parge coating, elastomeric coatings and anti-graffiti coatings and performed stone floor cleaning mockups
Developed several alternative repair schemes for review by the architects and City of Los Angeles
In addition to restoring the building, the City wished to expand the observatory. The 40,000 sq ft expansion, discretely placed primarily underground and in building elements carefully woven into the original exterior, permitted the original building to appear much as it has since 1935. SGH designed waterproofing for the underground addition and developed restoration procedures for marble floors and travertine walls.