
Custom Rohnert Park Insulation provides insulation contracting throughout Napa, CA - including air sealing services, attic insulation, and crawl space insulation - and has been serving Sonoma and Napa County homeowners since 2015.
Custom Rohnert Park Insulation provides insulation contracting throughout Napa, CA - including air sealing services, attic insulation, and crawl space insulation - and has been serving Sonoma and Napa County homeowners since 2015.

Napa sits in the heart of wine country and has experienced several significant wildfire events in recent years, including the 2017 Atlas Fire and the 2020 LNU Lightning Complex fires, which brought smoke and ash throughout the city even though the fires did not reach downtown. Air sealing the attic floor is one of the most effective ways to reduce wildfire smoke intrusion, improve energy efficiency, and stop conditioned air from escaping year-round. Older Victorian and Craftsman homes near downtown - along with stucco ranch homes built in the 1980s and 1990s on the east side - often have air leaks at recessed lights, plumbing penetrations, and rim joists that allow outdoor air and particles to infiltrate constantly. For Napa homeowners concerned about wildfire smoke, high energy bills, and indoor air quality, our air sealing services seal these gaps and provide lasting protection.
Napa summers are hot and dry, with temperatures regularly reaching the low to mid-90s from June through September, and inadequate attic insulation allows radiant heat to pour into living spaces all day long. Many pre-1980 homes in Napa have original insulation that has settled or compressed over the decades, leaving large areas with little to no coverage. Attic insulation upgrades to R-38 or higher provide immediate comfort gains, reduce cooling costs sharply, and make homes more livable during the long summer months without relying on air conditioning running constantly.
Many older Napa homes - particularly Victorian and Craftsman homes near downtown and along Jefferson, Franklin, and Oak streets - have raised foundations with uninsulated crawl spaces that absorb cold air in winter and moisture year-round. Napa receives about 25 to 30 inches of rain annually, nearly all of it falling between November and March, and that moisture seeps into crawl spaces that lack proper vapor barriers, causing cold floors, musty odors, and wood rot on floor joists. Insulating crawl space walls or floors and installing a ground-cover vapor barrier solves these problems permanently.
Napa has a large share of homes built before 1980, and many of them have little to no insulation in their exterior walls. Retrofit insulation - which involves drilling small holes through the interior or exterior wall surface, blowing in cellulose or fiberglass, and then patching and finishing the holes - brings these older homes up to modern standards without tearing out drywall or siding. This is one of the most cost-effective upgrades a Napa homeowner can make, especially on wood-frame homes with original single-pane windows and minimal wall insulation.
For Napa attics that have some existing insulation but fall short of current R-value targets, blown-in cellulose or fiberglass is the most efficient way to bring them up to standard. It installs over existing material, fills around obstructions, and reaches every corner without requiring removal of what is already there. This is the most common attic upgrade we perform in Napa homes where original insulation has settled or thinned over the past 30 to 40 years.
For Napa homes with hard-to-reach spaces - like rim joists, sill plates, and foundation transitions - spray foam provides both insulation and air sealing in a single application. Older homes that have shifted or settled over the years often have gaps at the base of walls and around foundation elements where standard batts or blown-in insulation cannot fully seal the space. Spray foam expands to fill these voids, preventing air leakage and moisture intrusion at the same time. It is particularly effective on homes that sustained foundation damage during the 2014 South Napa earthquake and have been repaired but still have lingering air leaks.
Napa is a mid-sized city with a population of roughly 80,000 people, sitting at the southern end of the Napa Valley wine region. Home values here are high - median values often exceed $600,000, and many properties top $800,000 or more - and homeowners in Napa tend to invest in maintaining and upgrading their properties because of the equity they hold. The local economy leans heavily on tourism, hospitality, and the wine industry, and the city draws millions of visitors each year. The housing stock in Napa includes a mix of Victorian and Craftsman homes near downtown, stucco ranch homes from the 1980s and 1990s on the east side and outskirts, and newer subdivisions on the hillsides above the valley floor. Many older homes have mature trees, large lots, and wood framing that requires regular upkeep.
The climate in Napa is Mediterranean, with hot, dry summers and wet winters. Temperatures regularly climb into the 90s from June through September, and the area receives 25 to 30 inches of rain per year, nearly all of it falling between November and March. Wildfire risk has become a major concern after the 2017 Atlas Fire and the 2020 LNU Lightning Complex fires brought smoke and ash to the area, and many homeowners have pursued air sealing and ember-resistant upgrades to reduce fire risk and smoke intrusion. The 2014 South Napa earthquake also damaged a lot of older homes, particularly those with brick chimneys and unreinforced masonry, and some of those repairs were done quickly and could benefit from a closer look. Contractors who work in Napa need to understand how these factors affect older wood-frame homes and what upgrades provide the most value.
Our crew works throughout Napa regularly, and we understand the local conditions that affect insulation contractor work here. We have worked on homes near Oxbow Public Market along the Napa River, Victorian and Craftsman homes in the downtown historic district, and stucco ranch homes on the east side neighborhoods near Silverado Trail. The city has a wide range of property types, and each neighborhood presents different challenges - older homes near downtown often have settling and foundation issues, while newer subdivisions tend to have under-insulated attics and poor air sealing.
Napa sits at the southern end of Napa Valley, where Highway 29 and Highway 121 meet, and we serve the area regularly from our base in Rohnert Park. Nearby communities like Sonoma and Novato face similar challenges - older homes, hot summers, wet winters, and wildfire risk - and we know what works and what does not for homeowners in this part of the Bay Area.
Call or submit a contact form, and we respond within one business day to schedule a free on-site estimate. We ask about your home, the problems you are seeing, and what you want to accomplish so we can arrive prepared.
We inspect your attic, crawl space, and other areas of concern, take measurements, and review the current insulation and air sealing situation. If your home is older or sustained damage in the 2014 earthquake, we flag any potential issues with settling, wood rot, or structural gaps. We provide a written estimate on the spot with a clear breakdown of cost, materials, and timeline. No pressure, no upselling.
Most insulation jobs in Napa are completed in one day. We protect floors and work areas, install the insulation, seal air leaks, and clean up thoroughly before we leave. You do not need to be present during the work, but we are happy to walk you through the project before we start.
After the work is complete, we walk you through what we did, show you the finished areas, and answer any questions. You receive a project summary and warranty information, and we follow up to make sure you are satisfied with the results.
We reply to all Napa area inquiries within one business day. No pressure, no upselling - just a clear, written estimate and honest answers to your questions.
(707) 210-9475Napa is a mid-sized city with a population of roughly 80,000 people, located at the southern end of the Napa Valley wine region about an hour north of San Francisco. The city sits at the confluence of several highways - Highway 29, Highway 121, and Highway 12 - and is well known as the commercial and cultural center of the Napa Valley. The downtown historic district along Main Street and First Street includes Victorian-era commercial buildings, restaurants, wine tasting rooms, and walkable streets along the Napa River, and the Napa Valley Wine Train runs through the city and up the valley. Older residential neighborhoods near downtown - along Jefferson, Franklin, and Oak streets - include Victorian and Craftsman bungalows built between the 1880s and 1930s, many with wood siding, covered front porches, and mature oak and walnut trees.
The housing stock in Napa ranges from these historic homes near the downtown core to stucco ranch homes built in the 1980s and 1990s on the eastern and southern edges of the city, typically on smaller lots with tile roofs and attached garages. The city experienced significant damage during the 2014 South Napa earthquake, which cracked brick chimneys, damaged foundations, and caused structural issues on many older homes - some of those repairs are still being addressed. Nearby communities include Sonoma to the west and Novato to the south, and the region is part of the broader Bay Area housing market.
Seal gaps and maximize energy efficiency with professional spray foam application.
Learn MoreKeep your home comfortable year-round with properly installed attic insulation.
Learn MoreFill hard-to-reach spaces quickly with high-performance blown-in insulation.
Learn MoreSafe removal of old or damaged insulation to prepare for a fresh installation.
Learn MoreProtect your floors and reduce moisture with crawl space insulation.
Learn MoreStop drafts and energy loss by sealing air leaks throughout your home.
Learn MoreHigh-density foam that delivers superior R-value and moisture resistance.
Learn MoreLightweight, flexible foam ideal for interior walls and sound dampening.
Learn MoreCode-compliant insulation solutions for commercial and industrial buildings.
Learn MoreBlock ground moisture from entering your crawl space and damaging your home.
Learn MorePrevent condensation and moisture damage with professional vapor barrier installation.
Learn MoreCall today for a free estimate, or fill out our contact form to get started.