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<br />83 <br /> <br />-~ <br />X.BUILDING MATERIALS AND COVIE~INGS <br /> <br />- <br /> <br />10.1 Introduction <br /> <br />The use/risk classification of a building material or cqvering is rated high, medium or low <br />according to its susceptability to flood damage or loss! A high rating means the material has a <br />high susceptability to flood damage and a low rating 1'eans if has a low susceptability to <br />flood damage. Common materials used in residential, \:ommercial-industrial, and mobile <br />home construction have been evaluated as an did in i~jentifying potential flood damage in <br />existing flood plain structures and in providing criteria! for less vulnerable materials for future <br />flood plain construction. The definition for each risk r~ting is given in the next section <br />followed by Tables 10.1 and 10.2 showing ratings of v~"ious materials. <br /> <br />1 0.2 Classes of floor, Wall and Ceiling Materials <br /> <br />High Risk. Materials designated high risk expene~ce extensive loss and damage when <br />exposed to floodwaters and do not offer any watf"proofing protection. The vulnerability <br />of these products results from Lise of adhesives which are water soluble or not resistant <br />to alkali or acid in water, including ground scepate and vapor. Safe use of high risk <br />matenals IS limited to floodproofed spaces claSSified as completely dry. <br />Medium Risk. Medium risk materials do not offer lany waterproofing protection, but are <br />not as easily damaged as high risk materials. The :majority of materials in this class are <br />susceptible to flood damage and loss as a result J,f containing wood, wood products. <br />gypsum products, or other material which dissolvfS, deteriorates, loses structural integri- <br />ty, or is adversely affected hy water. Safe use of ~ledium risk materials is limil<?d to dry <br />or essentially dry flood proofed spaces which mayl be suhject to water vapor and slight <br />seepage. <br />Low Risk. Floor, wall and ceiling materials in this qlass are waterproof and usually do not <br />require special treatment or protection from f1oo~waters. Safe use of these materials is <br />recomm,?nded for any flood proofed structures. ' <br />Special Considerations: Several materials in this class ~"e noted as impervious to clean water <br />hut may degenerate due to alkali or acid present in fldodwater. An additional risk may be <br />associated with materials which absorb or retain watericxcessively after submergence and <br />(ause structural damage due to water loads. <br /> <br />1. <br /> <br />2. <br /> <br />3, <br />