Foggy Windows Montreal - Why Double Pane Window Get Cloudy?
The Problem with Foggy Insulated Gas Units
windows Montreal and cloudy double pane windows are an eventual occupancies among home owners, businesses
and property managers. One of the questions that is often asked by these people is, "Why do my windows fog
up?" Among window manufacturers and window contractors, it is understood that
a small amount of condensation will occur on the inner panes of insulated glass units (IGU's) and this
condensation is sometimes accepted as long as this condensation does not obstruct the view through the ouble pane
window for extended periods of time. If the condensation continues to exist for an extended length of time,
damage to the wood frame and mold growth may occur.
There has been extensive research conducted by the Lawrence Berkley National Laboratory (LBNL) to better
unerstand why this occurs. The American Society of Heating, Refrigeration and Air Conditioning Engineers
(ASHRAE) and other establishments have also conducted volumes of research on this topic as well.
How are Double Pane Windows Constructed?
To better understand why windows fail and fog up, we need to look more in depth to the basic construction of
double pane windows. Looking at the diagram, the inner and outer pane are held
together by a sealant. The sealant is designed so that desiccant is placed inside the window as well.
The desiccant is a substance that removes any moisture inside the double pane area by absorbtion. A spacer is
places to keep the desiccant in place and to maintain a consistant distance between the inner and outer glass
When the window is installed, it is subjected to wide fluctuations in temperature changes. These
temperature changes will expand the glass thermal pane when heated and contract when cooled. This expansion
and contraction eventually compromises the window seal and it cracks. Air is then allowed to enter the space
between the inner and outer glass panes and this air contains moisture vapor. The moisture in the air will
condense based on the temperature changes and for a specific length of time, the desiccant material will absorb
this moisture and keep your windows clean and clear.
The problem of foggy windows occurs when the desiccant has saturated and can no longer absorb the incoming
moisture. Water droplets then start to form on the inside glass panes and we end up with foggy or cloudy
windows. This condensation will cause considerable damage to the window frame. If your window frame is
made of wood, then the wood can rot. Additionally, the moisture will lead to the
formation of mold and this can be harmfull to the people inhabiting the room.
Why causes the window seal to crack and fail? First one must understand that the crack in the seal can be
microscopic and invisible to the naked eye. The microscopic crack is large enough to allow moisture to enter
the inside of the double pane space. Cause of IGU window sealant failure can be manufacturing defects,
improper application, chemical incompatability among the various parts of the window unit, improper transportation,
handling and installation and finally the mechanical stress due to the expansion and contraction due to the
temperature changes of the environment.
When water occurs inside the window IGU, this water can further damage the seal and accelarate the end life of
the double pane window.
Extended periods of water condensation can leach the constituent components of the glass and deposit them on the
glass surface resulting in a cloudy effect which increases the inability to see through the window.
One other possible reason for cloudy windows can be caused by sunlight affecting the seal, desiccant and other
components of the window to a point where the chemicals released from the sunlight heating the window reacts and
forms a cloudy film on the inside surface of the window. This is called "outgassing".
At the end of the day, your double pane windows will eventually fail. This will cause an unsightly window
unit in your home or office, inhibit the ability to view through the window and the formation of mold due to
excessive moisture can cause health risk to the people in that room.
Window Medics are committed to providing 100% satisfaction to our customers. If you are looking to buy new
windows, replace old windows, repair broken or cracked windows or restore your foggy or cloudy windows, Window
Medics is your answer.
Call Your Montreal Window
Window Medics Montreal
2572 Daniel-Johnson Blvd, 2nd Floor, Laval, Quebec H7T 2R3
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