Rywen Insulation is a family-owned insulation contractor based in San Leandro, California. Owner Roni Galicia operates Rywen under CSLB license #1140414. Rywen installs attic insulation, encapsulates crawl spaces, installs vapor barriers, and seals rodent entry points. Rywen serves detached single-family homes across the East Bay, the Peninsula, and Marin County, including Oakland, Berkeley, Lafayette, San Mateo, Redwood City, Danville, and Walnut Creek.