The lean-to structural ceiling design shown in FEMA P-320 can be built by a dedicated DIY’er with some time and less than $500 in materials. To add a tornado safe room to an existing basement, one affordable option is the FEMA lean-to design. Why? Because the main structure will fail and we don’t want it to take the tornado safe room with it. And the tornado safe room should be separated from the rest of the structure. ![]() ![]() As we mentioned above, it’s important to create a structural ceiling to your tornado safe room in addition to the walls. Also called FEMA P-320, this document gives details and construction drawings for creating several different types of storm shelters. If you’ve decided to build your new home with a basement, or if you would like to make your existing basement safer, you may want to check out the FEMA publication, Taking Shelter From the Storm: Building a Safe Room for Your Home or Small Business. Now think about the size of the average home…it’s not uncommon for a side wall of a small, modest home to be 30 feet long.much bigger than the 8 feet we used in our example! This helps us better understand why the average home disintegrates at these wind speeds.įorming Up a Poured Concrete Basement Wall Basement Safe Room This force is equivalent to the weight of three mid sized sedans… an absolutely huge force for such a small surface area. The total force created on the positive pressure side of this small building is… 9030.86 pounds!
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