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Concrete masonry units shall be of a modular design and <br /> conform to ASTM C-90 , Grade U - 1 . <br /> Brick masonry units shall be clay and conform to ASTM C- <br /> 216 , Grade SW for below groundwork and grade MW for the <br /> above groundwork . <br /> Reinforcement of all masonry unit walls shall be provided at <br /> alternate courses with " Dur-O-Wall , " "Wal-lock, " " Block-Lok" <br /> or approved equal . <br /> Anchors and ties shall be of ferrous metal , with zinc coating <br /> conforming to ASTM A- 153 , Class B- 1 , B-2 , or B -3 , as <br /> appropriate , and as follows : <br /> a . Rigid steel : 1 " x '/4" x 24" , with ends turned down 3" . <br /> b . Wire mesh : 16 gage , %2-inch mesh , 3" x 16" <br /> c. Veneer ties : No 6 W & M gage wire bent 90 degrees <br /> to form 2-inch hook for mortar embedment, or 22 U . S . <br /> gage corrugated sheet metal . <br /> d . Spacing of ties shall be such that each tie shall not <br /> support more than 3 square feet of wall area with <br /> vertical spacing not more than 24" , and with additional <br /> ties at wall openings . <br /> Mortar shall conform to ASTM C-270 (except that slag <br /> cements shall not be used ) , Type M or S . Type N may be <br /> used for non-bearing interior walls and partitions above <br /> grade . . <br /> 5 . Waterproofing <br /> Waterproofing shall be provided in two (2 ) coats on all <br /> exterior surfaces of subgrade concrete or masonry walls , with <br /> outside lap of vapor barriers , damp checks or waterproof <br /> membranes thoroughly sealed into the sidewall waterproofing <br /> material . <br /> Waterproofing material shall be an asphalt base coating <br /> applied in accordance with manufacturer' s recommendations <br /> — Tnemec Co . No . 461 , " Foundation Coating " ( black) or <br /> approved equal . <br /> Minimum film thickness (dry) after application shall be 8 . 0 <br /> mils for first coat, 6 . 0 mils for second coat. <br /> 6 . Architecture and Wall Finishes <br /> Complete architecture plans and specifications for building <br /> shall be submitted for approval by the County prior to <br /> construction . In no case shall a structure be planned or <br /> designed without regard to aesthetic appearance and <br /> maintenance costs . <br /> 13-7 <br />