Pasadena Library Roof Secured for Rainy Season

Construction crews installed plastic sheeting to protect the historic building as seismic retrofit work continues.

Updated on Oct. 30, 2026 in Construction

Bold flat-color editorial illustration showing geometric overlapping planes, representing protective sheeting on a library roof, in an institutional register. — The City of Pasadena has installed protective sheeting on the Central Library's roof to shield its interior during ongoing seismic retrofit operations. AI Illustration. Upload story photo >

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Crews have covered the Great Hall roof of the 135,000-square-foot Central Library in Pasadena with plastic sheeting to shield the interior from upcoming rain. The protective measures occur as the city advances a major seismic retrofit for the 1927 facility.

Why it matters

The library was shuttered in 2021 after a structural assessment revealed the masonry building was susceptible to earthquake collapse. Protecting the site from moisture is essential to preserving its historic interior throughout the multi-year construction process.

The current construction contract is valued at $165,659,609, supported by $11.74 million in bond proceeds drawn as of June 30. Voters previously approved the $195 million Measure PL general obligation bond with 72.42 percent support.

The players

Central Library

This historic library building in Pasadena serves as the main branch of the city's library system and was built in 1927.

The details

Workers are currently performing rebar fitting and shotcrete installation to reinforce the structure against seismic activity. The city expects the basement footing and slab pours to reach completion by the end of October 2026.

The Central Library original building construction was completed in 1927.
The library closed for structural safety reasons on May 3, 2021.
Voters approved the Measure PL bond in November 2024.
Basement concrete pours and roof covering completion are expected by the end of October 2026.
Project completion is targeted for summer 2028.

Market Landscape

The Central Library retrofit project aligns with the broader municipal effort to upgrade aging unreinforced masonry structures to current safety standards. This initiative reflects a wider trend of city governments investing in significant historic preservation and seismic resilience through voter-approved general obligation bonds.

Taxpayers funding this project through Measure PL will see a levy of $28.90 per $100,000 of assessed valuation. Residents remain without use of the facility until its planned reopening following the completion of these structural safety upgrades.

The takeaway

Maintaining climate control and structural integrity during a long-term closure is vital for historical preservation. Homeowners can apply these lessons in property maintenance by ensuring temporary protective measures are in place before seasonal weather shifts occur.

What happens next

City officials expect basement footing and slab pours to be completed by the end of October 2026, with the overall retrofit project scheduled for completion by summer 2028.