This fact sheet from the National Fire Protection Association describes the use of exterior sprinklers to minimize the possibility of home ignition, but warns that other methods are probably more practical.
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NFPA Fact Sheet – Exterior Sprinklers
Top Concerns
Central Texas is in a long drought cycle, despite occasional rain. Dry NWACA landscapes and the homes within are vulnerable to wildfire because we live in a greenbelt with a lot of wildfire fuel in its dead and down material. Our homes are most at risk from flying embers. They can be made relatively safe by removing debris, sealing all points of entry from flying embers, and clearing dead and dry vegetation. If you haven’t yet done so, please get a free home assessment to help you identify your risks. Use the Home Firewise Risk Evaluation form in the Be Involved menu on the home page.