A QUICK RECAP OF WINDOW PERFORMANCE RATINGS

////A QUICK RECAP OF WINDOW PERFORMANCE RATINGS

A QUICK RECAP OF WINDOW PERFORMANCE RATINGS

2018-08-26T13:36:07+00:00 August 26th, 2018|

There are so many different measurements used to rate a window’s performance. Windows are tested for insulation, leakage, sound transmission, condensation and a whole lot of other things explained in our article THE LANGUAGE OF WINDOWS. I find it hard to remember whether a high number or a low number equals good performance for each rating. Here is quick cheat sheet to remind you.

THE HIGHS

Condensation Resistance:  High number = better resistance to condensation

Water Infiltration: High number = better resistance to water leakage

Structural Performance Rating: High number = better resistance to wind

Acoustic Performance Rating: High number = better at blocking sound

Outside-inside Transmission Class: High number = better at blocking sound

Sound Transmission Class: High number = better at blocking sound

Security Performance Rating: High number = better at keeping burglars out

THE LOWS

U-Factor: Low number = better insulation

Air Leakage: Low number = better insulation

THE “I DON’T KNOWS”

Solar Heat Gain Coefficient: High or low = depends on where you live

Visible Transmittance: High or low = depends on what you want