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Pure Eco includes air sealing as a standard component of our attic insulation projects and also offers it as a standalone service for Santa Monica homeowners.
Insulation slows heat transfer while air sealing stops air movement. In Santa Monica, where the dominant environmental challenge is moisture rather than extreme heat, this distinction is particularly important. Uncontrolled air movement through the building envelope does not just affect thermal comfort and energy costs; it also brings coastal humidity into the wall cavities, floor systems, and attic spaces where it degrades materials over time. Air sealing in a coastal home is as much about moisture management as it is about energy efficiency.
Contact us at (877) 870-7998 for a free air sealing consultation.
Santa Monica homes leak air in the same places that homes everywhere do: can lights recessed into the ceiling below the attic, attic hatch covers that are rarely insulated or properly sealed, gaps between drywall and top plates where air moves freely from the wall cavity into the attic, and plumbing, electrical, and HVAC penetrations that are unsealed on the attic side. The consequences in Santa Monica are compounded by the moisture load those air leakage pathways carry.
When marine layer air infiltrates through unsealed attic penetrations, it brings humidity into the attic space. In an under-ventilated attic with inadequate insulation, the humidity creates condensation on cold surfaces and sustained moisture levels that support mold growth. In the crawl space, unsealed penetrations in the floor system allow humid ground-level air to migrate into the living space above. Air sealing breaks those pathways and reduces the volume of uncontrolled moisture-laden air entering the building envelope.
Santa Monica homeowners who are considering solar installation should know that air sealing and insulation are consistently the first improvements recommended before panels are sized and installed. Reducing the heating and cooling load of the home through envelope improvements makes the solar system smaller, less expensive, and more effective over its lifetime.
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Santa Monica falls within California Title 24 Climate Zone 6. Title 24 includes air sealing requirements for new construction and certain renovations. For existing homes not undergoing permitted renovations, air sealing is not mandatory, but it is one of the most cost-effective energy- and moisture-management improvements available.
The construction type of your Santa Monica home affects the air sealing scope. The older Craftsman and Spanish Colonial homes in Ocean Park and Sunset Park may have balloon-frame wall construction, which creates a continuous air channel from the crawl space through the wall cavity and into the attic. Sealing the top plate connection in these homes is especially important because the moisture pathway extends the full height of the building. The postwar ranch and tract homes in the eastern residential neighborhoods have platform framing with smaller but still significant gaps at penetrations and attic transitions.
Caulk is used for small gaps at penetrations, along top plates, and at transitions between materials.
Spray foam is used for medium to large gaps around pipes, electrical boxes, and HVAC chases.
Rigid blocking with sealant is used for large open areas such as dropped soffits, fireplace chases, and areas where framing creates open passages into the attic.
Recessed light covers are airtight covers that fit over existing recessed fixtures from the attic side, eliminating one of the most significant air leakage paths in older Santa Monica homes.
A standalone air sealing project in a typical Santa Monica home takes three to five hours. When performed as part of an insulation project, it may add two to three hours and is completed before insulation installation begins. The work is done entirely from the attic. Living areas are not disrupted.
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After
Yes. Air sealing reduces the volume of uncontrolled marine layer air entering the building envelope through gaps and penetrations. Controlling air movement is one of the most effective ways to manage moisture accumulation in attics, wall cavities, and floor systems in a coastal home.
The EPA estimates that air sealing combined with insulation can reduce heating and cooling costs by 15 percent in homes with significant existing air leakage, which is common in Santa Monica’s pre-1980 housing stock.
Yes, consistently. Reducing your home’s heating and cooling load through air sealing and insulation before sizing a solar system means the system required is smaller and the return on the solar investment is better.
No. Air sealing addresses the ceiling plane between the living space and the attic. Attic ventilation, which manages temperature and moisture within the attic space itself, is maintained and verified after every air sealing project.
Both. Standalone air sealing assessments and installations are available, and air sealing is included as a standard part of our attic insulation projects.
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Pure Eco provides free in-home assessments for air sealing throughout Santa Monica. We identify your home’s primary leakage points, explain the moisture and energy impact of sealing them, and give you a detailed estimate with no obligation.
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