Stc Rate Floor Assembly

Stc is calculated by taking the transmission loss tl values tested at 16 standard frequencies over the range of 125 hz to 4000 hz and plotted on a graph.

Stc rate floor assembly.

Sound transmission class guidance. Ultimately the design and detailing of the project assembly or system is the responsibility of a professional and all projects must comply with applicable building. 5 or 6 points in laboratory stc ratings for essentially similar assemblies. Wall floor assembly guide insulation for sound fire rated assemblies.

Insulation will noticeably improve the stc rating of an assembly. Sound transmission measurement of the ability of a wall or floor assembly to isolate airborne sound and prevent it from passing from one class stc side to the other. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. Here you can find drawings for our ul fire rated floor assemblies and ul fire rated ceiling assemblies.

55 59 stc and 73 iic w c p. Staggered or double stud walls are higher rated than single stud walls. Metal stud walls perform better than wood stud walls. Ul l502 cul l502.

Transmission the passage of sound waves from its source through a vibrating medium and to a listener. Our range of drawings can help pros plan projects more effectively by utilizing designs for a fire rated ceiling assembly. Resilient channel can improve the stc rating of an assembly. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies.

Iic impact isolation class astm e492 e989 and stc sound transmission class astm e336 e413 are both tests for sound traveling through the total floor ceiling assembly from an upper living area to a lower living area. Impact sound complaints are common on floor ceiling assemblies that meet the bare minimum requirement of 50 decibels iic. Adding additional layers of drywall can improve the stc rating of an assembly. One layer 1 x24 toughrock shaftliner or densglass shaftliner panels between 2 1 2 floor and ceiling j runners with t section of 2 1 2 steel c t studs between panels.

This is usu ally because there is a pronounced dip in the test curve and the stc rating is heavily influenced by a measurement in one fre quency band. Stc ratings for wall floor and window materials and assemblies 3 appendix a stc ratings a 1 walls a 1 exterior a 1 interior a 9 wooden studs a 9 metal studs a 14 floors a 16 wood a 16 concrete a 21 windows a 24 doors a 27 exterior a 27 interior a 29 appendix b references b 1.