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Insulating Windows, Insulation Values

Soundproof Windows Also Act as Insulating Windows

Specifics on Insulating Windows

  • Adds 2.5 or more to your existing R value
  • 3.84 R value behind single paned window with 1.5" air space separation.
  • 0.26 U value behind single paned window with 1.5" air space separation
  • 0.38Cfm/ft crack - air infiltration rate by itself
  • 0.15 to Nil Cfm/ft crack - air infiltration rate when combined with existing window
Two major factors contribute significantly to the overall insulation value of windows:

  1. Basic insulation value of the window unit(s).
  2. Air infiltration around and through window seals.

Insulation Values of Soundproof Windows

By increasing the window insulation R value by 2.5, your BTU loss through your windows will be substantially reduced. The window BTU heat loss will be reduced by approximately 77% or more for single paned windows and approximately 50% for dual paned windows (See BTU loss chart below).
The insulation values are better because of the air space and the thermal break between the two windows.

There is also a special effect peculiar to the behavior of air that makes a 1.5 inch air space between two windows significantly better than a sealed air space of less than an inch.

An air pocket or bubble 'adheres' to glass and is increased or diminished with wind. This is the major reason glass has ANY insulating value. With a single pane of glass there are two air bubbles; with dual pane units, there are three air bubbles (or four if it is triple glazed). However, with a second window acting as an insulating window, you have five bubbles with single paned windows if the air space is more than 1 inch. They are the inside and outside of each window plus the air space between the two windows. Since the windows are more than an inch apart, the bubbles do not 'connect' and become one bubble, like they do with dual paned glass with less than an inch of air space.

This is also a major factor needed to reduce condensation.

BTU Losses and Insulation Values *

 
Insulation
Values
BTU Loss Per Month
 
Inside
Temperature 70° F
R
Value
U
Value
Average Outside Temperature
Window Description
 
(1/R)
40° F
30° F
Pct
Reduction
Single pane glass
1.15
0.869
2,981,000
3,971,000
0%
Dual pane glass with 1/2" air space
1.81
0.55
1,426,000
1,901,000
53%
Insulating Soundproof Window over single pane window with 1.5" air space
3.84
0.26
674,000
899,000
77%
Insulating Soundproof Window over dual pane window with 1.5" air space (estimated)
4.40
0.23
600,000
800,000
80%
* Does NOT include air infiltration losses. BTU loss calculations based on average home with 120 square feet of glass.