Dow's Styrofoam Highload Foam Insulation Board features exceptional moisture resistance and R-value retention. All three Styrofoam Brand Highload products resist compressive creep and fatigue, delivering long-term compressive strength. Like all Styrofoam Brand insulation products, Styrofoam Brand Highload 40, 60 and 100 are durable, versatile and reusable '“ making them a preferred choice for a variety of high-load applications.