Stc 50 Exterior Wall

Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

Stc 50 exterior wall. To view different wall assemblies click on each point below that may apply to your project. With 1 3 4 45 mm galvanized roofing nails 7 178 mm o c. Staggered or double stud walls are higher rated than single stud walls. Fire resistance ratings with 3 4 u ltracode core panels in steel framed partition assemblies for more information see the following brochures.

Metal stud walls perform better than wood stud walls. In addition penetrations and openings in these partitions must be sealed lined or otherwise treated to maintain the stc. Guidance on achieving this for masonry walls is contained below in design and construction. Exterior wood framed wall exterior side.

Exterior surface covered with weather exposed cladding or finish system. Partitions serving the above purposes must have a sound transmission class of at least 50 db for airborne noise when tested in accordance with astm e90. All too often this plenums and suspended ceilings unbaffled ducts window to window outdoors common heating units transoms and air grilles unblocked joist spaces uncaulked wall perimeters ducts piping and fixtures masonry joints. 50 stc with single layer designs have achieved up to 4 hr.

Insulation will noticeably improve the stc rating of an assembly. Remember that a standard wood stud wall has an stc of 35 while a metal stud wall 25 gauge has an stc of 44. In order to achieve an stc of 50 and higher you must stagger or double the studs for wood stud walls use a resilient mount such as iso clips and or add multiple layers of soundproofing materials or drywall. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.

Sound transmission class guidance introduction the noise guidebook pages 33 37 provides an elementary discussion of stc provides some stc ratings for common building materials and limited exterior and interior wall construction configurations and describes a method to determine composite stc value of a wall containing a window or door. Best blocking stc 50 full height walls preferred a sound blocking level of stc 50 means that a listener in a quiet room would need to exert effort to hear raised speech levels in adjacent rooms and the speech would not be understandable or disruptive.