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.
Stc 50 suspended ceiling.
Through base layer perpendicular to.
24 x 48 tiles.
All too often this plenums and suspended ceilings unbaffled ducts window to window outdoors common heating units transoms and air grilles.
Two hour fire rated partition.
Available in two sizes.
High cac ceiling panels can provide this type of sound control increasing speech.
Installs by simply placing on top of existing ceiling tiles.
24 x 24 tiles.
In base layer and 1 5 8 2.
Drop ceiling tile sound barrier is made with foil faced mass loaded vinyl bonded to a scrim faced fiberglas.
Maximum with 1 5 8 41 mm type s drywall screws 8 203 mm o c.
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.
Test curve and the stc rating is heavily influenced by a measurement in one fre quency band.
25 gauge metal studs 24 with 1 type s drywall screws 36 o c.
An assembly rated at stc 50 will satisfy the building code requirement.
Stc ratings of 50 if tested in a laboratory or 45 if tested in the field.
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.
Some armstrong ceilings contain mineral wool but they do not represent a health risk see below.
Stc 50 lab test 3 tl 93 333 alternative stc 50 wall options.
One hour fire rated partition parallel to one side of min.
Stc rating of 29 and fire rated astm e 84 class a.
The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.
Optimizing ceiling systems and lightweight plenum barriers to achieve ceiling attenuation class cac ratings of 40 45 and 50.
Fire rated floor ceiling assemblies using metal framing stc 50 iic 50 fire rating as shown 1.
5 8 15 9 mm toughrock fireguard c gypsum board or 5 8 15 9 mm densarmor plus fireguard c gypsum panels applied perpendicular to i shaped wood joists or wood and steel trusses spaced 19 2 488 mm o c.
50 stc with single layer designs.
Ubc requirements for floor ceiling assemblies.
The field test evaluates the dwelling s actual construction and includes all sound paths.
