Exterior wood framed wall exterior side.
Stc 50 exterior wall.
These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.
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.
5 8 15 9 mm densglass fireguard sheathing or toughrock fireguard x sheathing applied vertically or horizontally to 2 x 4 wood studs 16 406 mm o c.
The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.
In addition penetrations and openings in these partitions must be sealed lined or otherwise treated to maintain the stc.
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.
Fire resistance ratings with 3 4 u ltracode core panels in steel framed partition assemblies for more information see the following brochures.
Guidance on achieving this for masonry walls is contained below in design and construction.
Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.
If field tested an stc of 45 must be achieved.
50 stc with single layer designs have achieved up to 4 hr.
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.
Remember that a standard wood stud wall has an stc of 35 while a metal stud wall 25 gauge has an stc of 44.
Metal stud walls perform better than wood stud walls.
To view different wall assemblies click on each point below that may apply to your project.
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.
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.
With 1 3 4 45 mm galvanized roofing nails 7 178 mm o c.
