Case study of modifications to a wood “I” beam framed floorceiling assembly which did not meet minimum International Building Code (IBC) impact insulation class (IIC) or sound transmission class (STC).

摘要

A direct comparison, using three identical floor-ceiling assemblies, which did not meet minimumbuilding code standards for impact insulation class as built. Each floor-ceiling assembly receiveddifferent corrective measures in an effort to correct the deficiency. All corrective measures wherelimited to the bottom side of the assembly, since hardwood flooring was installed as the finishedfloor. All the floor-ceiling assemblies consisted of light weight sixteen (16) inch deep Truss JoistTJI Brand “I” beam structural framing members (joist) spaced at sixteen (16) inch center tocenter supporting ¾ inch plywood (tongue & groove edge detail) with 1-1/2 inch light weightgypsum concrete covered with ½ inch plywood and finished with hardwood flooring. Using oldindustry standard methods, products and systems the best impact insulation class (IIC) increasewas twelve (12) points which still did not meet minimum building code standards. By installingstate of the world noise control products, using current known installation methods availabletoday for under the floor-ceiling assembly the field impact insulation class (FIIC) was increasedtwenty eight (28) points to a field impact insulation class (FIIC) of sixty (60) without acousticalmat materials on the top side of the assembly. By design and materials selection the field soundtransmission class was also improved from forty (40) to fifty five (55) due to product selection,installations procedures and design.