The purpose of this CIR is to request approval for one ID credit for an innovative approach to material reduction by using QuietRock soundproof drywall in lieu of multiple layers of traditional drywall. INTENT: To minimize the total quantity of new gypsum wallboard (drywall) used in acoustically sensitive buildings through accurate performance specifications, enhanced materials, and efficient design. The innovative approach will be applied to walls and partitions specified as acoustically high performance for interoffice privacy and/or noise control (sound transmission class 50 or higher). In some cases, a single layer of soundproof drywall can be used to replace up to five layers of traditional drywall. This product and design approach will result in a significant reduction in the total embodied energy of the materials used in the building. (The BEES software from NIST has reported that a single panel of drywall represents between 150,000 to 300,000 Btu\'s of embodied energy). REQUIREMENT: Minimize amount of building materials used by designing walls meeting the sound isolation requirement with QuietRock soundproof drywall. Demonstrate at least a 20% savings in the quantity of gypsum wallboard used compared to the baseline design using conventional, techniques and materials. SUBMITTALS: Architectural plans, details and specifications, a letter signed by the architect or acoustical engineer outlining the acoustical performance requirements identified in the design, the measures implemented in the approach, photographs of soundproofing measures under construction, bills of sale of soundproofing drywall materials purchased, and calculations demonstrating at least a 20% savings in the quantity of drywall used compared with conventional, baseline construction techniques and materials. DESIGN APPROACH: For a two-story multi-purpose commercial building, areas of the floor plan require additional noise control (due to amplified lecture halls or private workspaces). Well established performance specifications required that these walls perform to an STC 50 or higher. These partitions have been designed using QuietRock, an innovative soundproof drywall, so that an over 20% material reduction is achieved. The process was as follows: 1. All walls with a sound isolation requirement have been reviewed by a qualified professional to assess/confirm minimum performance requirements and alternate, material-optimized assemblies were recommended. 2. Acoustical walls requiring multiple layers of gypsum drywall have been redesigned using layer(s) of soundproof drywalls in their place. 3. Architectural details have been added that address acoustical seal and closure best practices for optimal sound isolation. 4. Per CIR 12/6/2002 and 1/9/2003, the basic steps for Boeing to achieve an ID Credit for Material Reduction will be: - Provide documentation, such as a narrative and drawings, to prove on the validity of the baseline to which the project is compared. - Provide a convincing and thorough analysis of this condition by a knowledgeable professional, such as an acoustical engineer or an architect. - The actual bill of materials purchased and a spreadsheet comparing quantities & costs. - A letter signed by a responsible party enumerating and certifying the product and building methods. Should this credit be audited, the applicant also should be prepared to provide photographs of the soundproof wallboard installation in the field.