Foam has an R6 insulation value, versus R1 for air
Added Energy Savings
Milwaukee Windows are built for energy efficiency. Combined with energy efficient glass options like Low-E and Argon, foam-filled vinyl brings an added dimension of savings by reducing the amount of heat displacement through the vinyl itself.
The foam-fill process uses a unique low-density foam that has minimal expansion qualities, so there is no risk of bowing or breaking to the window (unlike competitors windows). Foam is inserted in every chamber of the vinyl where drainage is not needed.
In one example, foam filled vinyl reduces U-value from .24 to .22, an 8% thermal improvement.
Milwaukee Windows and Patio Doors with CleanFree Glass
CleanFree is available on all vinyl windows and patio doors