Corsella D¿rken recently unveiled Delta-FL, the company’s wood-framed subfloors. Delta-FL is capable of supporting up to 6,000 pounds per square foot. According to the company, Delta-FL keeps moisture from passing through concrete and provides insulation. Delta-FL is available with a 20-year product warranty and can be used with laminate flooring. The subfloor is available in 5-by-65.6-foot rolls and 4-by-8-foot sheets