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The United States experiences more tornado activity than any other country in the world. Engineers at the USDA’s Forest Products Laboratory (FPL) have developed a residential tornado shelter that meets industry safety standards and can be built in an existing home by advanced DIYers. This step-by-step Construction Guide can be used by advanced DIYers and remodelers to build this shelter room design in an existing home. In addition to this Construction Guide, you may also be interested in the companion six-part video series on the Home Innovation Research Labs YouTube Channel as well as the TechSpec design overview.