Spray polyurethane foam (SPF) is a highly effective insulation material that significantly improves a building’s energy efficiency by sealing gaps and creating an airtight barrier. Unlike traditional insulation like fiberglass or cellulose, SPF expands on application to fill cracks and voids, reducing heat loss in winter and heat gain in summer. This tight seal minimizes air leaks that cause drafts and lost energy, helping reduce heating and cooling costs. The foam’s high R-value per inch means it provides excellent thermal resistance in a thinner layer than many other insulation types. Additionally, SPF can serve as an air barrier and moisture barrier, which helps maintain better indoor air quality and prevents mold growth that could compromise energy performance over time.
If you suspect your SPF insulation isn’t performing as it should — maybe you notice drafts, uneven temperatures, or increased utility bills — a simple visual inspection and touch test can help. Look for areas where the foam appears compressed, crumbled, or missing, as damaged foam loses insulating power. You can also check attics or crawl spaces for thermal leaks around windows, vents, or penetrations in the building envelope. Safe DIY checks involve looking for signs of moisture damage or gaps while ensuring good ventilation during inspection. However, because SPF is sensitive to application quality and may be covered by a warranty, it’s wise to call a professional roofer or insulation expert if you find issues or after several years. When hiring a contractor, ask specifically about their experience with SPF applications and if they honor manufacturer warranties. Also, clarify how they inspect and address aging foam to maintain energy efficiency over time.