FAQs

Spray foam insulation, also referred to as spray polyurethane foam insulation, is a product applied using a sprayer that combines two liquid components. Upon application, the foam expands to completely fill cavities and cover surfaces. It's commonly used for insulating walls, attics, ceilings, floors, basements, and crawlspaces. The two liquids comprise methylene diphenyl diisocyanate (MDI), polymeric methylene diphenyl diisocyanate (pMDI), polyols, catalysts, blowing agents, flame retardants, and surfactants.

The primary distinction between spray foam insulation and conventional insulation types like fiberglass or cellulose is that spray foam functions as both an air barrier and thermal barrier in one product. Traditional insulation forms do not impede air flow. Spray foam insulation effectively provides insulation and air sealing simultaneously, which is crucial for establishing a continuous and comprehensive thermal and air barrier within the building envelope.

Spray foam insulation comes in two distinct types: open-cell and closed-cell. Closed-cell foam hardens into a rigid state, while open-cell foam cures to a softer, spongy texture. In terms of insulation effectiveness, closed-cell foam has an R-value of approximately R-7 per inch, whereas open cell foam is around R-4 per inch. Closed-cell foam creates an air barrier at just 1 inch of application, while open-cell foam typically requires 3 inches. Additionally, open-cell foam is water permeable, unlike closed-cell foam, and offers superior soundproofing qualities.

While each project has unique requirements, we typically suggest open-cell spray foam for attic insulation and closed-cell spray foam for basement or crawlspace applications. Open-cell foam is preferable for attics due to its moisture permeability, allowing water from potential roof leaks to pass through and be detected. Closed-cell foam is not recommended for attic use as it could trap moisture from leaks, potentially causing roof rot and damage. However, closed-cell foam may be suitable along the roof line in hurricane-prone or high-wind areas for added structural integrity. For basements and crawlspaces, closed-cell foam is ideal, as it creates a moisture barrier, preventing damp air from entering the living space.

Applying spray foam along the roof, rather than the attic floor, offers additional benefits. It transforms the attic into a climate-controlled storage space, enhancing comfort and freeing up floor space previously covered by traditional insulation. This approach has also been shown to extend the lifespan of HVAC air handlers located in attics by shielding them from temperature extremes. The decision between insulating the attic floor or roof decking often depends on budget considerations, as the attic floor typically covers less square footage than the roofline or decking.

For new construction or major renovation projects, we can insulate exterior walls with spray foam or a combination of spray foam and traditional fiberglass batts, using a method called 'flash and batt.' In existing homes, focusing on insulating the attic and crawlspace or basement significantly improves comfort and efficiency without the need to insulate walls. Wall insulation in existing homes can be invasive, so we help clients avoid this by concentrating on the top and bottom of the thermal boundary of the conditioned space.

Spray foam insulation is indeed safe. However, some individuals may be sensitive to the fumes produced during the installation process, known as off-gassing. To ensure safety, we advise occupants to vacate the premises once spraying begins and remain away for 12-24 hours after completion. This allows sufficient time for the foam to fully off-gas. After this period, the home is completely safe for occupancy.

The cost of spray foam insulation is influenced by various factors. As a general guideline, spray foam is approximately twice the cost of traditional fiberglass insulation. Factors affecting the price include job size, foam type, the need for existing insulation removal, and local regulations requiring ignition barriers. Despite the higher cost, spray foam provides superior performance as it serves as both an air barrier and insulator, offering better value when installed by our trained professionals.

Spray foam insulation will indeed reduce your energy costs. The exact payback period varies depending on factors such as home occupancy patterns and HVAC system usage. Our clients typically report energy bill savings ranging from 15% to 30% in spray foam-insulated homes compared to those with traditional fiberglass insulation, which often lack proper air sealing.

When properly installed and protected from direct sunlight, spray foam insulation has a lifespan that matches that of the structure it's installed in. It does not degrade over time, making it a long-lasting insulation solution.