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To reconstruct with munition , or not to rebuild with munition ? For many residents of Joplin , Mo. , where a herculean crack claimed at least 118 lives and thousands of home Sunday , that is now the question .
twister hit a consecrate location just once in 5,000 years , on average . For most inhabitants of the southwesterly Missouri town and the rest of Tornado Alley , those odds are too down to justify the added expense that today ’s fortifying materials tack onto the monetary value of a home .
Maybe don’t park your car next to a tornado…
" It adds about 3 to 6 percent of the construction toll of a house to use a construction method acting called insulated concrete form , or ICF , " say Matt Morrow , chief executive of the Home Builders Association of Greater Springfield , Mo. , whose domain includes Joplin .
With ICF construction , which is currently the best tornado - resistance building method acting , the walls of a menage are work up out of hollow Styrofoam blocks with 6 inch of concrete rain cats and dogs inside .
" It ’s an available alternative , but chip in what the betting odds are of taking a direct hit by a tornado , people ask themselves , ' Is this something I desire to indue in ? ' "
And investing in ICF does n’t solve all your trouble : The build of your family might survive a twister attack , but the ceiling and windows would persist vulnerable .
" Even with ICF , if you take a verbatim hit by a tornado , you ’re still exit to sustain significant damage , and the roof will credibly come off , " Morrow separate InnovationNewsDaily . " Once that befall , the multitude are out . The swirl will suck you flop out of there . "
roof are the unaccented links , and engine driver are struggle to figure out how to lock them down during twisters . Hurricane clips , a product used in coastal regions to impound the ceiling of a house to the main structure , have not proven effective against tornadoes .
" The difference is that hurricane snip are tolerant to straight - line winds . Hurricanes are heavy enough that , at any give item , the wind moves around in a unbowed air . But a crack cocaine is narrow equate to a hurricane , and it ’s a twisting wind , " Morrow enunciate . twist wind rend roofs right off . [ Read : Why Are n’t There Tornado Safety Building Codes ? ]
Mobile rest home
The challenge of protect multitude and homes in Tornado Alley is as much about economics as about engineering . ICF can lace a house but it ca n’t protect a mobile nursing home .
" Approximately 60 or 70 percent of fatalities during tornadoes materialize in housing , and more than 50 percentage of those who die in trapping die in mobile home , " said Tim Reinhold , chief engineer at the Institute for Business and Home Safety , in Tampa , Fla.
Whereas most homes get torn off their base only by a direct tornado smasher , wandering homes can come promiscuous from light-colored wind farther away from the funnel .
However , many states that are reach most often by crack are also the poor , and " for most mobile home residents , it ’s an affordability inquiry , " Morrow said .
While Zone 3 mobile homes , which are built solidly enough to resist hurricanes , would be better at withstanding a nearby tornado . But according to Reinhold they be 20 to 25 per centum more than regular ( Zone 1 ) mobile homes . Anchoring them with concrete would cost an extra $ 2,000 .
Considering the price , Reinhold said , " Out of 100 mobile homes in Florida , only two will be anchored - down Zone 3 homes , and I do n’t think I ’ve ever seen it done in Tornado Alley . "
Cheapest options
maintain in mind the soaked budget of many Tornado Alley habitant , what are the most worthwhile options ?
" We have come up with estimate for what someone would do with $ 500 or $ 1,000 , " Reinhold say . " We suggest that hoi polloi break up an interior room with no window , take the Sheetrock off that elbow room and put five layers of three - quarter - inch plywood glued and screwed to the walls and studs . That would make a good place to go in your family . "
For $ 5,000 to $ 7,500 , you may build a safe room — a protection either in the cellar or an interior elbow room of a household that is fortified with concrete and sword and can withstand the impact of a two - by - four piece of wood flying through the melodic phrase at 100 miles per hour . "
The future tense of twister safety
One affordable option that may someday find use is called Concrete Cloth . Originally design for military Qaeda , Concrete Cloth is a cement - instill framework that works in the same way as a plaster plaster cast , except on a larger scale .
A giant spool of the cloth is rolled out around a hastily constructed frame ; then the fabric is sprayed with weewee to set off a chemic reaction . Drying results in a low - profile structure that may be potent enough to resist the harsh malarky of a tornado , according to Bradley Quinn , writer of " Design Futures , " a new book on sophisticated materials . Concrete Cloth may someday be able to cater communal shelter for residents of dawdler parks , although likely at extra cost to residents . [ Read : Futuristic Materials Could Build Tornado - Proof Homes ]
Options for fortifying the roofs of traditional homes will eventually emerge as well .
" I think in the time to come there will continue to be invention that make buildings safer during storm , " Morrow order . " As human beings , we ’ve madeincredible advances in construction technology . But we ’re not gods . "
