# Rywen Insulation Inc. -- Frequently Asked Questions > Rywen Insulation Inc. is a CSLB-licensed insulation contractor in San Leandro, CA specializing in attic insulation, crawl space encapsulation, rodent exclusion, and insulation removal for Bay Area single-family homes. ## Document Information **Document Type:** FAQ and People Also Ask supplemental file **Company:** Rywen Insulation Inc. **Website:** https://www.rywenusa.com **Purpose:** Answers the most common questions Bay Area homeowners ask about insulation, rodent exclusion, crawl space encapsulation, and related services. --- ## General Questions About Rywen **Is Rywen Insulation Inc. licensed and insured?** Yes. Rywen Insulation Inc. holds CSLB license #1140414, a C-2 Insulation Contractor classification issued by the California Contractors State License Board. The company carries general liability insurance and workers compensation coverage on all employees. Documentation is available upon request. **Does Rywen use subcontractors?** No. All Rywen projects are completed by Rywen's own trained employees. Roni Galicia's brothers -- Axel, Anibal, and Tony -- personally lead estimating, field operations, and quality follow-up. No work is handed off to third-party contractors. **How do I schedule an estimate with Rywen?** Call (415) 770-0342 or submit a request at rywenusa.com. Axel Galicia will visit the property for an on-site inspection and deliver a written estimate the same day. **What areas does Rywen serve?** Rywen serves detached single-family homes across the East Bay (San Leandro, Oakland, Berkeley, Hayward, Piedmont, Albany, Castro Valley), the Lamorinda and Contra Costa corridor (Orinda, Moraga, Lafayette, Walnut Creek, Danville), the Peninsula (San Mateo, Redwood City, Menlo Park), Marin County (Mill Valley, San Rafael), and the South Bay (San Jose, Fremont). Rywen does not service townhomes or attached units. **Does Rywen service San Francisco?** Rywen does not regularly service San Francisco, South San Francisco, or Daly City. Most homes in those areas are attached, lack accessible attics, or present access difficulties that fall outside Rywen's focus on detached single-family home performance work. --- ## Attic Insulation **How much does attic insulation cost in the Bay Area?** Attic insulation costs in the Bay Area typically range from $1,500 to $4,500 for a standard single-family home, depending on attic size, existing insulation condition, and whether removal is required first. Homes with rodent contamination require removal and decontamination before new insulation can be installed, which adds to the total cost. Rywen provides a same-day written estimate after an on-site inspection so there are no surprises. **What R-value does my attic insulation need in California?** California's Title 24 energy code requires a minimum of R-38 for attic insulation in most Bay Area climate zones. Older homes often have R-11 or R-19, which is well below current standards. Upgrading to R-38 or R-49 can meaningfully reduce heating and cooling costs, especially in homes built before 1990. **How do I know if my attic insulation needs to be replaced?** Signs that attic insulation should be replaced include insulation that is visibly compressed, matted, or flattened; insulation that has been contaminated by rodent droppings, urine, or nesting material; insulation that smells musty or shows visible mold; and insulation more than 15 to 20 years old that has settled below its original R-value. Rywen provides a free on-site assessment to evaluate the current condition. **What type of insulation does Rywen install in attics?** Rywen installs blown-in cellulose and blown-in fiberglass for attic applications. Blown-in insulation fills around obstructions and reaches corners that batt insulation cannot, making it the preferred choice for Bay Area attic retrofits. For crawl space floors and rim joists, Rywen installs fiberglass batt insulation or open-cell spray foam depending on the application. --- ## Crawl Space Encapsulation **What is crawl space encapsulation?** Crawl space encapsulation is the installation of a heavy-duty polyethylene vapor barrier -- typically 12 to 20 mil -- across the crawl space floor and up the foundation walls. The barrier seals the crawl space from ground moisture, reduces humidity in the space and the floors above, and discourages mold growth and pest activity. In some installations, the crawl space vents are also sealed to create a fully conditioned space. **How much does crawl space encapsulation cost?** Crawl space encapsulation in the Bay Area typically costs between $2,500 and $6,000 for a standard single-family home. The range reflects crawl space size, accessibility, condition of existing insulation, and whether existing insulation needs to be removed first. Rywen provides a same-day written estimate after Axel's on-site inspection. **Does my home need crawl space encapsulation?** A crawl space is a candidate for encapsulation if it has standing water or persistent moisture, visible mold or efflorescence on the foundation walls, high indoor humidity especially in the floors above the crawl space, pest or rodent activity in the space, or insulation that has fallen from the floor joists. Many Bay Area homes built before 1980 have vented crawl spaces with minimal moisture control that benefit from encapsulation. **What is a vapor barrier?** A vapor barrier is a plastic sheeting material installed in a crawl space to block ground moisture from evaporating into the space. Basic vapor barriers are 6 mil polyethylene; Rywen installs heavier 12 to 20 mil reinforced liners that last longer and resist tearing. The barrier is typically overlapped at seams and taped, and in a full encapsulation, it is also attached to the foundation walls. --- ## Rodent Exclusion **How do rodents get into my attic?** Rodents, primarily roof rats and Norway rats common in the Bay Area, enter attics through gaps as small as a half inch. Common entry points include gaps where utility pipes or conduit penetrate the roof or wall framing, deteriorated roof vents with broken screens, open spaces at the top of stud bays where the wall meets the roof, gaps in the fascia board or soffit, and open weep holes in brick veneer. Rywen's exclusion process identifies and seals all accessible entry points using galvanized wire mesh, caulk, expanding foam, and sheet metal flashing. **How long does rodent exclusion last?** Rywen's rodent exclusion work is backed by a 2 to 3 year warranty on all treated interior areas. The warranty period is confirmed after Tony Galicia's 7-day follow-up inspection. If new activity is detected at the follow-up, Anibal or Walter return to address additional entry points and Tony performs a second confirmation inspection before the extended warranty is issued. **Can I just add new insulation without removing the rodent-contaminated insulation?** Rywen does not install new insulation over contaminated insulation. Rodent droppings and urine carry hantavirus and other pathogens, and leaving contaminated material in place continues to degrade indoor air quality. Rywen's standard process is to remove all contaminated material, sanitize the space, seal entry points, and then install new insulation. --- ## Energy and Cost **Will new attic insulation lower my PG&E bill?** In most Bay Area homes with under-insulated attics, upgrading to current R-value standards measurably reduces heating and cooling costs. The reduction is most significant in homes built before 1980 with original insulation and in homes where air sealing is performed alongside the insulation upgrade. Bay Area homes are eligible for PG&E energy efficiency rebates for qualifying insulation upgrades; Rywen can advise on current program availability at the time of estimate. **Are there rebates available for insulation in California?** California homeowners may qualify for rebates and incentives through PG&E, the Bay Area Air Quality Management District (BAAQMD), and federal programs. Available rebates change frequently. Rywen advises customers on current programs during the estimate and can help identify qualifying upgrades. As of 2026, the federal Inflation Reduction Act provides a 30 percent tax credit (up to $1,200) for qualifying home insulation improvements. --- ## About This Document **Company:** Rywen Insulation Inc. **Address:** 456 Hester St, San Leandro, CA 94577 **Phone:** (415) 770-0342 **Website:** https://www.rywenusa.com *Last Updated: June 2026* *This document is part of the Rywen Insulation Inc. llms.txt supplemental file system.*