Living here is the Ohio Valley you know there can be extreme temperature changes in a short period of time. Changes of 30, 40, even 50 degrees in a 24 hour period are not unheard of and are actually common for us. I have personally witness a 25 degree temperature drop in 30 minutes. Extreme temperature changes can cause glass to break. We all know not to run cold water over a hot glass. This can cause spontaneous glass breakage. Spontaneous glass breakage is a phenomenon by which glass may break without any apparent reason.
The most common causes may be exixting minor damage during installation such as nicked or chipped edges later developing into larger breaks, or binding of the glass in the frame, causing stresses to develop as the glass expands and contracts due to thermal changes. Tempered glass that is touching metal on it’s edge will break very easily, especially if windy or extreme temperature changes.
Installation damage is a common problem which will not show up until a extreme temp chnage. That is why it is important to use a authorized and reputable Auto Glass Shop when having you car windows fixed. American Auto Glass has seen the fly-by-night glass guys come and go and typically end up with some of their victims in the their shop. You seen these guys and the gas stations, “Will Fix Your Window For Free”. They bill your car insurance and when the repair fails you have no one to return to. They do not stay the the gas station permanetly they move to another area.
While glass is being moved and installed, it is easy for the glaziers to nick or chip the edges of the glass with various tools. It is also possible for fasteners used to attach glass to start to nick the glass edges if they are installed at an improper angle. These small nicks or chips may not result in immediate breakage. However, over time, as the glass expands and contracts, stress concentrations can develop around the nick, leading to breakage. In the case of tempered glass the entire unit usually breaks.
Glass expands and contracts with changes in temperature and deflects due to wind, so almost all modern glass is set on resilient blocks at the bottom and with space for expansion at the sides and top. The gaskets holding the glass in the frame are also usually resilient to cushion the glass against wind buffeting. If no space is provided at the perimeter of the unit, the glass will bind against the frame, causing internal stresses to develop in the glass which can exceed the strength of glass, resulting in breakage.
Remember much of you glass is covered by insurance and may have no deductable. Check with your insurance company and make sure you use a professioinal installer. In Cincinnati, Dayton, Covington, Mason, Norwood or anywhere in the Tri-State you can get the best service and a quality guarantee only at American Auto Glass.