We have had some devastating fires in the past several years here in So Cal. There has been much discussion about how to prevent this devastation in the future. One of the solutions has been clearing of brush around the perimeter of the home. While keeping brush cleaned up can help, it can also give homeowners a false sense of security.
It is customary after a fire for the experts to investigate and analyze the path, and causes, of wildfire. Recently, the Institute for Business & Home Safety (IBHS) reported their findings after the Witch Creek Wildfire in 2007. IBHS inspected approximately 3,000 homes in an attempt to discover why some survived and some didn't. Interestingly, homes that were built within 15 feet of each other were at great risk, as well as homes next to wild lands.
One idea that is often accepted is that brush alone is the cause of these fires. Of course, fuel is required for fire, but that is only one element of fire. Heat and oxygen are also required for a fire to start. Next, add high winds (Santa Ana winds) and you've got a wildfire, and quite possibly, a catastrophic wildfire or firestorm.
When considering fire safety, keep in mind, the elements required for a wildfire. If there are strong winds, heat, and fuel, a fire will move quickly and without a predictable direction. No one's house is safe in these conditions, even those who have diligently (and sometimes excessively) cleared brush. High winds carry embers for miles and where these embers land is anybody's guess. That is why it is important to make sure the exterior of your home is sealed properly. A small gap in the roof and/or siding is an ideal place for an ember to get caught and burn. 
Also, it is important when clearing brush that is done correctly. Clearing everything creates an environment for grass and weeds to grow quickly before other (slower burning) plants have time to become established-grass and weeds are highly flammable.
There are many resources to help homeowners assess their homes' condition. The community of Rancho Bernardo is conducting several workshops for homeowners. Please click here for more information on fire safety.
Be informed, and safe, this fire season.
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