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6.3 ROOF <br />The roof s hall be constructed of one-piece .090" aluminum. Th is alu minu m shall be <br />a high ly corrosion resistant alloy and a ten s il e st rength range of 28,000 to 33,000 psi . <br />The roof subst ructure shall be const ructed of four (4 ) fu ll -length "Z" se ctions MIG <br />welded to the roof for support. The "Z" secti ons shall be a series of six (6) separate <br />pieces running full length , front to back, bridging to the roof bow framework . They <br />shall be of equally spaced d istance, inboard to outboard, sta ir stepped s izes of 3/4" x <br />1-1/2" x 3/4" inboard , 3/4" x 1-1/4" x 3/4" center, and 3/4" x 1" x 3/4 " outboard to form <br />a crowned roof facilitating water runoff and ice build-up . The roof shall then be <br />reinforced the entire length of the unit. For this reason, flat roofs shall be considered <br />unacceptable. There shall be in addition to the above supports, twelve (12) .12511 x <br />2" x 2" cross members welded to the "Z" sections 12" on center and be made of a <br />highly corrosion resistant alloy with a tensile strength range of 31 ,000 to 35,000 psi. <br />Aluminum plates shall be welded between the roof support channels to mount <br />lighting fixtures, assist rails, hanging stretcher mounts, and IV holders. Corner <br />gussets shall be Heli arc welded to the roof radius extrus ions to enhance roof load <br />bearing characteristics. Horizontal corner extrusions shall be .125" thickness and 2- <br />1 /2" rad ius. There shall be an integral drip rail formed into the extrusion. The <br />horizontal extrusions shall use an interlocki ng method to secure the roof sheet into <br />the envelope of the extrusion. The horizontal extrusions shall be of an open-face <br />design for insertion of 2" x 2" x .12511 t ube structural members. Corner caps shall be <br />.125" ca st aluminu m and welded in place. <br />6.4SIDES <br />The s ides shall be constructed of .125" aluminum sheets with a highly corrosion <br />resistant alloy and a tensile strength range of 28,000 to 33 ,000 psi . The body shall <br />have straight sides free of waves and welding warpage. Doorjambs shall be formed <br />integral into the sidewall .125" aluminum sheets (extruded doorframes are not <br />acceptable). Each sidewall shall have twelve (12) vertical .125" x 2" x 2" wall studs <br />12" on center and joined to the roof supports. The box 2" x 2" channels shall be a <br />highly corrosion resistant alloy with a tensile strength range of 31,000 to 35,000 psi. <br />All box 2" x 2" roof and side support bows are .125" aluminum. Vertical corner <br />extrusions shall be .125" thickness and have a 2-1/2" radius. The radius ends shall <br />be tapered . The vertical extrusions shall be slotted for insertion of the sidewall <br />sheets. The vertical extrusions shall be of a web construction design for internal <br />structural support. The complete roof and s idewall structure sha ll be treated with a <br />sound-deadening barrier of BUNA Rubber. / <br />Y_L_N_ <br />A co nt inuous 8" x 2" s ide i mpact beam shall be welded to s ide body and sidewall <br />extrusions to each side of the unit where the squad bench and CPR seats are <br />located . This s ide impact beam shaJ I allow for secure and custom izable mounting <br />points for the squad bench and CPR seat seatbe lts . The side impact beam shall <br />also provide additional structure and rigid ity in these seating locations in the event of <br />an accident. Th is side impact beam shall be constructed of minimum a· x 2· x .250" <br />thick aluminum . Seat belt backer plates welded or adhered in between the extrusions <br />are unacceptable to this agency as this does not displace the energy of a side impact _L <br />as effectively as a continuous side impact rail. <br />Y_N