Does Moisture Between My Window Panes Mean They Need Replaced?

Double Pane Window
Insulated Window Unit

When it rains out or on a hot humid day do you see moisture or condensation between your window panes or do they appear to be fogged?  If so it probably means you need to replace the insulated unit so you have better insulation value resulting in better energy efficiency.


What is an insulated window (also referred to as double pane)?  It is a unit that consists of 2-3 glass window panes separated by a vacuum or gas filled space to reduce heat/cold transfer.  The glass panes are separated by a "spacer". A spacer is the piece that separates the two panes of glass in an insulating glass system, and seals the gas space between them.  An adhesive sealant is applied to the face of the spacer on each side and the panes pressed against the spacer.


The maximum insulating efficiency of a standard IGU is determined by the thickness of the space. Typically, most sealed units achieve maximum insulating values using a space of .63–0.75 in when measured at the center of the insulated glass unit (IGU). The effectiveness of insulated glass can be expressed as an R-Value.  The higher the R-value, the greater is its resistance to heat transfer. A standard IGU consisting of clear uncoated panes of glass with air in the cavity between the panes typically has an R-value of between 1 & 3.   The higher the R-Value, the greater the energy efficiency of the glass unit, and therefore the window. 


Most insulated window glass can be replaced without having to purchase an entire new window (with frame).  Give Frank's Glass a call at 513.829.8284 and schedule an appointment for us to come out and give you a free estimate.