Glass in windows breaks because of extreme temperature differences–which develop between the exposed glass and the glass protected by the window framing material–when exposed to the heat from a wildfire (or the heat from your neighbor’s burning home).Depending on the type of glass, a window that is exposed to flames may break after only 1-3 minutes of exposure to intense heat or flames and allow flames and embers inside.Dual-pane windows have two sheets of glass that are separated by airspace. Dual-pane windows provide better wildfire protection. Testing has shown that single-pane windows are highly vulnerable to breaking when exposed to wildfire conditions.Single-pane windows are more common in older structures.More Information About Fire-Resistant Windows. Photo credit: University of California Cooperative Extension
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