The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.
Stc 50 suspended ceiling.
Test curve and the stc rating is heavily influenced by a measurement in one fre quency band.
All too often this plenums and suspended ceilings unbaffled ducts window to window outdoors common heating units transoms and air grilles.
Optimizing ceiling systems and lightweight plenum barriers to achieve ceiling attenuation class cac ratings of 40 45 and 50.
Maximum with 1 5 8 41 mm type s drywall screws 8 203 mm o c.
Ubc requirements for floor ceiling assemblies.
One hour fire rated partition parallel to one side of min.
Two hour fire rated partition.
Stc 50 lab test 3 tl 93 333 alternative stc 50 wall options.
Through base layer perpendicular to.
Resilient channels attached 16 406 mm o c.
Drop ceiling tile sound barrier is made with foil faced mass loaded vinyl bonded to a scrim faced fiberglas.
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.
High cac ceiling panels can provide this type of sound control increasing speech.
Stc ratings of 50 if tested in a laboratory or 45 if tested in the field.
Some armstrong ceilings contain mineral wool but they do not represent a health risk see below.
Ceiling attenuation a measurement of the ability of a ceiling panel to block the travel of sound from an enclosed room up into the plenum class cac and down to adjacent spaces.
25 gauge metal studs 24 with 1 type s drywall screws 36 o c.
24 x 24 tiles.
Fire rated floor ceiling assemblies using metal framing stc 50 iic 50 fire rating as shown 1.
Installs by simply placing on top of existing ceiling tiles.
50 stc with single layer designs.
In base layer and 1 5 8 2.
Stc rating of 29 and fire rated astm e 84 class a.
Available in two sizes.
One hour fire rated partition 3.
The safety of those armstrong acoustical ceiling products that do contain mineral wool has been confirmed through occupational studies of mineral wool workers which have been carried out for more than 50 years.
In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies.
The field test evaluates the dwelling s actual construction and includes all sound paths.
