20 The ECOSPAN® Composite Floor System is an innovative, simple, effective and economical method of providing all steel, open web structural components for elevated floor construction while incorporating the benefits of lighter weight composite design. ECOSPAN® requires only a nominal 3 inch thick, 3000 psi concrete slab. The open web configuration and 48" o.c. joist spacing allows HVAC and electrical design flexibility. ECOSPAN® requires no stripping of formwork and no shoring. Consider the Advantages: • Ecospanisaneffectiveandeconomicalsolutionforconstructing residential and commercial floor systems. •  Erection is safe, easy, and cost effective. There are no short deck sheets, plywood forms or shoring; sub-trades can normally continue construction the day after the concrete is placed. •  Floor to floor heights can often be decreased due to the inherent ability to pass mechanical ducts, piping, conduit, etc. through the open web design. •  High strength-to-weight ratio of composite steel joists allows for greater spans and spacing with lighter members. •  Weight savings due to composite joist design reduces building weight and allows foundation and wall costs to be reduced. THE ECOSPAN® COMPOSITE FLOOR SYSTEM The ECOSPAN® Composite Floor System AN® Composite Floor System is an innovative, simple, effective and method of providing all steel, open web structural components for elevated ction while incorporating the benefits of lighter weight composite design. equires only a nominal 3 inch thick, 3000p.s.i. concrete slab. b configuration and 48” o.c. joist spacing allows HVAC and Electrical design OSPAN® requires no stripping of formwork and no shoring. •  Constructed with non-combustible materials, achieving multiple UL Fire Rating listings with gypsum board, acoustical ceilings, or spray applied fire resistant materials. •  The Ecospan Composite Floor System has a Sound Trans- mission Classification (STC) of 57 and meets or exceeds Impact Insulation Classification (IIC) requirements of the IBC for residential and commercial construction with commonly used sound attenuation materials. Environmental Advantages: The Ecospan Composite Floor System may contain a significant portion of recycled material which may be beneficial in achieving environmental certification, such as LEED, for your project. Please contact your Ecospan representative or visit: www.Nucor.com/responsibility/sustainability/compliance/leed for recycled content information. Basic Design Philosophy As a composite section, compression is carried by the concrete and tension by the bottom chord, maximizing the effective depth and increasing the capacity of the floor system. Typical ECOSPAN® System