Metropolitan Sytems Information Statement 1989

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STEP 4: ESTABLISH DESIGN DETAILS It is recommended that the principles listed below be incorporated into the design in its earliest phases to minimize exterior -interior sound transmission. Most of these principles are also consistent with the Minnesota Energy Code. Alternate design features may be accommodated but may require a more extensive acoustical evaluation. o Avoid large glass areas unless appropriate STC can be provided. o Use solid -core exterior doors (in combination with storm doors) where possible. o Use patio (glass) doors sparingly. o Do not use large wooden -frame casement windows that cannot accommodate the weight of heavier glazing. o Use skylights sparingly (STC-rated if possible). o Avoid roof -ceiling structures without insulated attics. o Specify caulking and sealing of all through -the -wall penetrations. o When using sound channels on interior skin, avoid bypassing channels by attaching shelving and appliances directly to studs. (For more suggestions on building practices to minimize noise impacts in a home, see U.S. Environmental Protection Agency, Quieting in the Home, Washington, D.C.: 1978). STEP 5: COMPLETE STANDARD CHECKLIST What type of acoustical information does the city require? A checklist of information needed for an acoustical evaluation (outlined below) should be completed and submitted to the local building inspector. STANDARD CHECKLIST FOR ACOUSTICAL INFORMATION 1. Name, address and telephone number of building plan submitter, architect, or other contact person for questions or clarification of the plans and information submitted. 2. Location of the site on the Noise Zone Map. 3. Set of plans and specifications with the following information: a. Floor plans and evaluations. b. Information on the exterior envelope of the building: 1) Exterior wall systems, including materials, elevations, sections, thermal or acoustical insulation used, R-values and STC values where available (or estimated). 7 1