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Home My WebLink AboutFlood Damage Resistant MaterialsFlood Damage. Resl*stant Materials Requirements for Buildings Located in Special Flood Hazard Areas in accordance with the National Flood Insurance Program Technical Bulletin 2 / August 2008 0 FEMA ��41VD 64 Table 1. Class Descriptions of Materials Z ` a Class. 5� '„ Class Description Nlghl real tanttof oad er'.age, including=damage caused by-roovmg water z= 1l hese rmalexta s an survnie went gndrytpg"and-trlaye suecesfall c#eaed�a= ^: ter a 6d taCerrder5them.�free of m�stxharrn ul-p_C tit nfs A/latetta#sue fhr ssar�e �permtt#e o#all` y�enclosed or�outstde u e with essentially unmitigated flood exposure. Resistant to floodwater' damage from wetting and drying, but less durable when ex- posed to moving water.2 These materials can survive wetting and drying and may 4 be successfully cleaned after a flood to render them free of most harmful pollutants.3 Materials in this class may be exposed to and/or submerged in floodwaters in interior spaces and do not require special waterproofing protection. Resistant to clean water4 damage, but not floodwater damage. Materials in this class may be submerged in clean water during periods of flooding. These materials can 3 survive wetting and drying, but may not be able to be successfully cleaned after floods to render them free of most' harmful pollutants. tiu J' A. Not resistant to clean water' damage. Materials in this class are used in predominant- ly dry spaces that may be subject to occasional water vapor and/or slight seepage. 2 These materials cannot survive the wetting and drying associated with floods. z Not resistant to clean water4 damage or moisture damage. Materials in this class are used in spaces with conditions of complete dryness. These materials cannot survive 1 the wetting and drying associated with floods. Notes: 1. Floodwater is assumed to be considered "black" water; black water contains pollutants such as sewage, chemicals, heavy metals, or other toxic substances that are potentially hazardous to humans. 2. Moving water is defined as water moving at low velocities of 5 feet per second (fps) or less. Water moving at velocities greater than 5 fps may cause structural damage to building materials. 3. Some materials can be successfully cleaned of most of the pollutants typically found In floodwater. However, some individual pollutants such as heating oil can be extremely difficult to remove from uncoated concrete. These materials are flood damage - resistant except when exposed to individual pollutants that cannot be successfully cleaned. 4. Clean water includes potable water as well as "gray" water; gray water is wastewater collected from normal uses (laundry, bathing, food preparation, etc.). MODIFIED FROM: USACE 1995 Flood Proofing Regulations Table 2 lists structural materials and finish materials commonly used in construction of floors, walls, and ceilings. For the purpose of this Technical Bulletin, structural materials and finish materials are defined as follows: ■ Structural materials include all elements necessary to provide structural support, rigid- ity, and integrity to a building or building component. Structural materials include floor slabs, beams, subfloors, framing, and structural building components such as trusses, wall panels, 1-joists and headers, and interior/exterior sheathing. - 4 TECHNICAL BULLETIN 2 — AUGUST 2008 Table 2. Types, Uses, and Classifications of Materials (continued) .° �- Types of fi3uildrng Materials a+ r�+ O • 4Jses of Bu�lcling �,.cce _ Cei rn s = Classes of Building Materials 5 R tale Unacce table p -Finish-Materials(floor-coverings,-walk- and ceiling finishes, insulation, cabi- nets, doors, partitions, and windows)_ Glass (sheets, colored tiles, panels) ■ ■ Glass blocks ■ ■ !I.sula#ion Sprayed p uret'hane fiiarn�&(SPUE)o ' -c ased�cellplast�c Inorganic -fiberglass, mineral wool: baits, blankets, or blown ■ ■ ■ All other types (cellulose, cotton, open- cell plastic foams, etc.) ® ■ ■ Linoleum ■ Magnesite (magnesium oxychloride) ■ ■ Mastic felt -base floor covering ■ ■ Mastic flooring, formed -in -place ■ ■ Metals, non-ferrous (aluminum, copper, or zinc tiles) ■ Metals Non-ferrous (aluminum, copper, or zinc tiles) ■ ■ Metals, ferrous3 ® ■ Paint Polyester -epoxy and other oil -based waterproof types ■ ■ Latex ■ ■ Partitions, folding Wood ■ ■ Meta13 ■ ■ Fabric -covered ■ ■ Partitions, stationary (free-standing) Wood frame ■ ■ Meta13 ■ ■ Glass, unreinforced ■ ■ Glass, reinforced ■ ■ Gypsum, solid or block ■ ■ 10 TECHNICAL BULLETIN 2 - AUGUST 2008