Why are my windows doing this?Open or Close
It’s the way they’re made. Windows are manufactured with desiccant (i.e. drying beads) built into the spacer. The constant heating and cooling of the airspace causes moisture to accumulate in the desiccant. Once the desiccant is saturated with moisture, and the outside temperature warms up (daytime), the moisture evaporates into the air space. When the outside temperature reaches the dew point (evening), fog and condensation will show up. At really cold temperatures the condensation will show up as starry patches (frost) on the inside air space of the window.
How long will it take to dry?Open or Close
By the time you notice the fog and condensation, there could be several cups of water in the desiccant. If we were able to remove the desiccant from the window, it would take 4 hours in a conventional oven at 200 degrees to dry. However, the air space in a window only heats up to 170 degrees, so the dessicant can only dry to about 80% in the first month. In the second month, we return to install our proprietary UV resistant hooded micro-vents which allow the window to breathe and continue expelling the moisture. The window may refog with temperature fluctuations, but it will be less and less each time. Once dry it will stay dry.
Are you going to reseal the unit?Open or Close
No. We re-engineer the unit so the moisture can escape. If not done, the moisture will continue to accumulate and the window will continue to deteriorate. Stages of Window
Will it restore the R value?Open or Close
Wet air is colder than the dry air. Drying the air space restores the window to that of a dead air space window which has an R value of about 4.2.
How long does the defogging process take?Open or Close
It is a 2 part process:
- Part 1 – Each window takes an average of 20 minutes to 1 hour. First we drill 2 small holes in the outside pane of glass. Then we spray in and extract a cleaning solution, followed by a drying solution. At the end we put in a mesh fabric to allow the window to continue to breathe and expel the moisture.
- Part 2 – It takes about a month for the window to expel about 80% of the moisture. At that point, we return to remove the mesh fabric and install UV resistant hooded micro-vents over the holes. After the micro-vents have been installed, the remaining moisture will continue to be expelled. You may notice refogging with temperature fluctuation, but it will be less each time and eventually it will disappear completely. A window that has accumulated a lot of moisture may take a couple of seasons to become fog-free. We continue to monitor the window to ensure that the window becomes fog-free.