Seamless acoustical plaster for California schools, theaters, houses of worship, and historic buildings, installed by BASWA certified installers.

Acoustical plaster is a seamless, sound-absorbing ceiling and wall finish that looks like smooth plaster. It gives architects and designers a continuous surface with no tiles, grids, or visible panels, while controlling echo and reverberation in the room. Across California, it's specified for schools, performing arts, houses of worship, hospitality, and historic buildings.
A BASWA system starts with sound-absorbing panels adhered to a stable substrate such as drywall, concrete, or existing plaster. Certified installers fill the seams and hand-trowel a porous marble-aggregate finish over the top. Sound passes through the finish's fine pores into the panel, where its energy turns into heat instead of reflecting back into the room.
BASWA acoustic North America supplies BASWA systems across California and connects every project with a certified installer. The systems carry a Class A fire rating and pass California's standard for VOC emissions from indoor building products.
California builds a wide range of hard-surfaced, daylit, and architecturally ambitious rooms. Acoustical plaster fits where sound control has to stay out of sight: the ceiling or wall looks like smooth plaster while it absorbs sound.
Learning commons, lecture halls, libraries, and lobbies need speech to carry clearly without the room turning loud. BASWA Phon is built for these gathering and lecture spaces, and it follows curved and vaulted ceilings, so campus buildings keep their architecture. California campus projects include the Chapman University Keck Center for Science and Engineering in Orange, the UC Berkeley Law Building, and UCLA Kaufman Hall.
Theaters and auditoriums need reverberation matched to the program, whether that's speech, music, or both. At the Gardiner W. Spring Auditorium at Chaffey High School in Ontario, BASWA Phon brought acoustic control to a historic performance space. Other California venues include the Madison Theater at Santa Monica College and Zellerbach Hall at UC Berkeley.
Sanctuaries often call for domes, vaults, and curves, and they need both spoken word and music to carry. BASWA Phon follows complex geometry, including domes and groin vaults, and comes in thicknesses up to 70 mm for rooms that need more absorption. In California, it's on the dome of the Armenian Diocese Church in Burbank and at Beth El in Escondido.
Patient rooms, waiting areas, and lobbies are calmer when sound doesn't linger. BASWA systems pair acoustic performance with a Class A fire rating under ASTM E84 and top-rated mold resistance under ASTM D3273. Acoustic treatment doesn't have to look clinical or be broken into tiles.
Galleries and cultural buildings need quiet without visual clutter, so the work on the walls carries the room. A seamless acoustical plaster ceiling reads as a plain plane of plaster, with no grid or panel seams to compete with the exhibit.
California has an older building stock worth keeping: Spanish Colonial, Mission Revival, and Art Deco theaters and civic buildings. BASWA Phon can be applied over existing plaster, and it works around molding and crown profiles rather than covering them. On older buildings, BASWA mechanical fixing inserts add a screwed connection between the acoustic panels and the existing surface, so the system stays in place even if aging stucco behind it starts to break down. See acoustical plaster in historic preservation.
Hotel lobbies, clubhouses, and restaurants are built with hard, beautiful surfaces that make conversation work harder. At Pelican Hill Resort in Newport Beach, BASWA Phon covers the domed and arched ceilings of the clubhouse, spa, and pool grill. In wine country, it's installed at REDD Restaurant in Yountville. For walls people will touch or bump, BASWA Basic is impact resistant.
Every BASWA system in California is installed by a certified installer: a plastering or drywall contractor trained by BASWA to apply the system to its standard. Certification is what keeps a hand-troweled finish consistent from one project to the next. It also gives general contractors a subcontractor who has done this work before.
BASWA certified installers have completed California projects from the Bay Area to Los Angeles, Orange County, the Inland Empire, and San Diego County. Tell us where your project is and what stage it's in, and we'll connect you with an installer who works in your area.
Contact us to find a certified installer.
Plastering and drywall contractors in California can train to install BASWA systems. Certified installers get product training, technical support from BASWA, and referrals when architects and owners ask who can install the system near them.
If your firm does high-finish plaster or drywall work in California, learn how to become a BASWA certified installer. Already certified? Ask about Advanced Training Certification.
BASWA systems and finishes pass the California Department of Public Health Standard Method v1.2 for VOC emissions from indoor building products, the test often called California Section 01350. That matters for schools, healthcare, and any project pursuing green building certification. Full results are on our technical data page.
BASWA Phon panels contain at least 80% recycled glass, and the finish is 95% recycled marble aggregate. The system is Living Building Challenge Red List free, with Health Product Declarations and Environmental Product Declarations available. Longevity is the larger sustainability story: BASWA systems installed in the early 1990s are still in service.
BASWA systems are installed by BASWA certified installers, who are plastering and drywall contractors trained on the system. Contact BASWA acoustic North America with your project location and we'll connect you with a certified installer in your area.
Plastering and drywall contractors can train with BASWA to become certified installers. Contact us to ask about certification.
Yes. BASWA finishes pass the California Department of Public Health Standard Method v1.2 for VOC emissions from indoor building products.
Yes. BASWA Phon follows curves, domes, and groin vaults, with a minimum radius of 2 feet for standard curved application. Tighter conditions are reviewed with our technical team before install.
Yes. BASWA Phon can be applied over existing plaster. On older surfaces, mechanical fixing inserts add a screwed connection that keeps the system in place if aging stucco behind it breaks down.
Custom homes across California use the same seamless acoustical plaster, including the Vault House in Oxnard. See acoustical plaster for homes for residential projects and how to get started.
Connect with our skilled network of certified installers
BASWA's network of certified installers is available throughout the world. Contact the installer in your project location.