ICF Contractor in Dandridge, TN for over 39 years. Serving Dandridge, Jefferson County & surrounding areas. By building with Fox Blocks Insulated Concrete Forms (ICF), you can produce a sustainable building enclosure that is energy-efficient, durable, and requires little maintenance. Not only do ICF walls increase the resistance to fire and safety from natural disasters, their airtight qualities allow for better indoor air quality. The monolithic wall provides a geothermal barrier that helps provide uniform interior temperature and superior sound attenuation properties to increase the building performance of any building type.