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Spray polyurethane foam (SPF) is a two-component liquid — a polyol resin and an isocyanate — that is mixed and sprayed on site. It expands within seconds and cures into a rigid or semi-rigid foam that insulates and air-seals in one step, and also acts as a vapor retarder. Open-cell foam is lighter and ideal for interior walls and soundproofing; closed-cell foam is denser, moisture-resistant and adds structural rigidity.

In most Bay Area homes, yes. Spray foam costs more upfront, but it seals the air leaks fiberglass and blown-in cannot, so most homeowners see a 30–50% reduction in heating and cooling costs. It also reduces moisture intrusion and mold risk, adds structural strength (closed-cell) and never sags or settles. Fiberglass and blown-in remain good choices for budget projects or retrofits where full air sealing is not the goal — and we install those too.

A typical single-family attic, wall or crawlspace project takes 1–2 days. Commercial jobs or whole-building encapsulation usually run 3–5 days. Closed-cell foam cures fully in about 24 hours; open-cell is ready for drywall within a few hours. You receive a written project timeline before work begins.

Yes. All occupants, including pets, should be out of the house during application and for at least 24 hours afterward while the foam off-gasses and cures. Once cured, the material is inert and non-toxic. Our crew walks you through preparation and safe re-entry timing.