Specifications include, but are not limited to: Wilkerson Commons rooftop ductwork AHU-1 and AHU-2. To replace insulation and put in place a protective barrier on external duct work that will shed the water and provide superior protection from the elements. - Ventureclad, Alumiclad or similar will NOT be allowed - Duct work must be sloped or crowned to shed water. As per original specs: - Insulation shall be 2 layers of 2” rigid Styrofoam, Dow (see attached) or equal, with the seams offset. - Insulation shall be secured to the duct to prevent air gaps. Additional specs: - Insulation shall have a protective metal cover of either .024” aluminum or .023” sheet metal. - Metal cover will have an embossed stucco finish. - The tops shall be sloped or pitched to prevent pooling.