A Vistaza building beside an elevated train line

High Performance uPVC Windows

Made for
sound.

Next to a rail line, a highway or a busy avenue, the glass decides how quiet the room is. We test it, and we print the number.

The quietest we make

OITC 40

outdoor-to-indoor · traffic, trains, aircraft

STC 47

speech and everyday noise

U 0.18

the same glass, NFRC-certified

Vi6 casement with laminated acoustic triple-pane glass, warm-edge spacer. Sound: Intertek report J4759. Energy: NFRC CPD VST-K-4-00266-00001.

Pick how quiet

Four steps up. Same window.

The frame stays the same. The glass changes. Each step is a tested glass on a Vi6 casement, with its energy numbers beside it so you can see what you trade.

Standard

Insulated double-pane · low-E, argon

27OITC

STC 33 · U 0.27

Quieter

Insulated double-pane, asymmetric · low-E, argon

34OITC

STC 39 · U 0.27

Quiet

Laminated acoustic double-pane · low-E, argon

38OITC

STC 46 · U 0.27

Quietest

Laminated acoustic triple-pane · low-E, argon

40OITC

STC 47 · U 0.24

Swipe for more ›

Hear what each glass blocks ›Find glass by your OITC target ›

Which number?

Street noise is OITC. Not STC.

STC was made for walls between rooms, so it leans on speech. OITC weights the low rumble of engines and trains, which is what a bedroom window on an avenue has to stop. If the spec only gives STC, ask for OITC too.

Read: STC and OITC are not the same number ›

Best tested, by product	STC	OITC	Report
Vi6 casementIntertek J4759	47	40	Intertek J4759
Vi6 fixedIntertek J4756	46	40	Intertek J4756
Vi6 terrace door, in-swingIntertek J4760	44	39	Intertek J4760
Vi6 hopperIntertek J4759 · casement test	46	38	Intertek J4759 · casement test
Vi5 casementIntertek P7089	39	33	Intertek P7089
Vi5 hopperIntertek P7089 · casement test	39	33	Intertek P7089 · casement test
Sliding doorIntertek S5790	37	32	Intertek S5790
Vi5 terrace door, in-swingIntertek P7090	36	31	Intertek P7090
Vi5 fixedIntertek P7088	38	30	Intertek P7088

New Utrecht: an eight-story Brooklyn building beside the elevated train, with Charcoal Gray Vi6 windows

On a building

Chosen for sound beside the elevated train.

New Utrecht, Brooklyn, stands beside the elevated train. Its Vi6 casements and fixed lites were built for that noise and reached OITC 38, with louvers and divided-lite bars in the same window grid.

See the project ›