Stc 50 Exterior Wall

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.

Stc 50 exterior wall. There are a number of other building codes with stricter regulations including the national association of home builders which requires an stc of 60. To view different wall assemblies click on each point below that may apply to your project. The stc rating of your exterior wall will vary somewhere between stc 35 to 45 depending on the exterior finish with an oitc rating of approximately 35. Staggered or double stud walls are higher rated than single stud walls.

No insulation 50 with insulation 54 staggered stud wall construction with 3 layers of 16mm 5 8 plasterboard on studs of 95x35mm 4 x 11 2 on a 120mm 4 3 4 common base. Exterior surface covered with weather exposed cladding or finish system. Our plan reviewer is requesting we provide an stc 50 wall at the exterior of the building where it is adjacent to an exterior corridor egress balcony. Insulation will noticeably improve the stc rating of an assembly.

The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. Although that ll help you meet code it doesn t mean it s sufficient to block out the noise tenants expect. With 1 3 4 45 mm galvanized roofing nails 7 178 mm o c. Metal stud walls perform better than wood stud walls.

International building code requires 50 stc between adjacent dwelling units. 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. I spoke with an acoustical consultant who basically said the wall rating would be negligible due to the openings door windows and this is not a viable request. Exterior wood framed wall exterior side.

The stc rating of a cmu wall can be estimated based on its weight using the following formula. Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate. There are numerous other issues that need to be addressed to. The specified rating of 45 for field tested assemblies noted in section 1207 10 of the labc is to be used for acceptance of individual jobs.

The estimate could easily be off by as much as 4 db.