Sound-rated windows, tested to STC 53
The Tacitus System received an STC 53 rating from Riverbank Acoustical Laboratories. Use it in commercial settings from medical offices to recording studios.
What the Tacitus System gives you
Tacitus is Avalon's double-glazed aluminum frame system for sound-rated openings.
STC 53, rated at Riverbank
Riverbank Acoustical Laboratories rated the Tacitus System at STC 53 under ASTM E90-09 (2016), report RAL-TL21-348, tested November 29, 2021. The tested unit was 47-11/16 inches wide by 95-3/4 inches high, with a 3-5/8 inch air gap between the two glass packs.
Glazing pockets for different glass
The glazing pockets take glass from 1/4 inch up to 5/8 inch. The standard glass bite is 1/4 inch, and 5/8 inch glass is set with a wet seal and the 6752 gasket.
A deep air gap
Any rating over STC 42 uses double glazing with 3-1/2 inches or more of air space. The Tacitus sections hold the two lites 3-1/2 inches apart.
Three throat sizes
Tacitus comes in 5, 5-5/8 and 8-5/8 inch throats, for 4-7/8, 5-1/2 and 8-1/2 inch walls. Each throat is 1/8 inch larger than the wall it fits.
Built for field assembly
Frames ship as knock-down units, with separate head, strike and hinge jambs and snap-on casing, pre-cut and boxed per opening.
Tacitus System
Tacitus System at a glance
Tacitus is Avalon's double-glazed frame system for sound-rated openings. Its glazing pockets take a range of glass thicknesses, and its air gap supports sound control.
The Tacitus System page has the section details, the STC reports and a Revit file. The Resources page also has the STC Frame-Glass Combinations chart.
STC 53, as rated by Riverbank Acoustical Laboratories under ASTM E90-09 (2016), report RAL-TL21-348. The STC reports are on the Tacitus System page.
For STC 53, Avalon specifies 9/16 inch laminated and 5/8 inch laminated glass, double glazed with 3-1/2 inches or more of air space. The 5/8 inch lite is set with a wet seal and the 6752 gasket. Avalon's STC Frame-Glass Combinations chart lists glass for STC 31 through 59. Any rating over STC 42 uses double glazing with 3-1/2 inches or more of air space, and STC 56 and 59 need an 8-1/2 inch wall (the 8-5/8 inch throat). The chart is on our Resources page.
Avalon points to commercial settings from medical offices to recording studios.
Glass from 1/4 inch up to 5/8 inch. 5/8 inch glass is set with a wet seal and the 6752 gasket.
Three: a 5 inch throat for a 4-7/8 inch wall, a 5-5/8 inch throat for a 5-1/2 inch wall, and an 8-5/8 inch throat for an 8-1/2 inch wall. STC 56 and 59 need the 8-1/2 inch wall.
There is no universal-throat option for double glazing, so a wall that falls between the Tacitus sizes needs shims or a wall backer, or the frame abuts the wall. Our article on throat size and wall thickness explains the options and the gaps each one needs.
Yes. Osprey doors can be paired with the Tacitus System. The Osprey door itself is rated STC 42 to 45. Send us your drawings and your STC target and we will quote it.
Tell us your STC target
Send the STC target, wall thickness and opening sizes with your drawings, and we will quote the Tacitus System to match.