Stepstone Inc. - Page 40

SCOPE:
STEPTREADS, AS MANUFACTURED BY STEPSTONE, INC. IN SIZES AS SPECIFIED ON ARCHITECTURAL DRAWINGS IN ACCORDANCE WITH STEPSTONE,INC. STANDARD DIMENSIONS.

A. SPECIFICATIONS FOR CONCRETE AGGREGATES SHALL CONFORM TO ASTM C-33

B. SPECIFICATIONS FOR PORTLAND CEMENT SHALL CONFORM TO ASTM C-150

CONCRETE STRENGTH:
THE AVERAGE CONCRETE TEST STRENGTH SHALL NOT BE LESS THAN 4,000 P.S.I. @ 28 DAYS WITH NO INDIVIDUAL UNIT TO BE LESS THAN 3,600 P.S.I.

ABSORPTION:
THE AVERAGE ABSORPTION OF THE TEST SAMPLES SHALL NOT BE GREATER THAN 5% WITH NO INDIVIDUAL UNIT GREATER THAN 7%.

PERMISSIBLE VARIATIONS IN DIMENSIONS:
LENGTH OR WIDTH OF UNITS SHALL NOT DIFFER BY MORE THAN +/- 3/16 IN. FROM APPROVED SAMPLES. HEIGHTS OF UNITS SHALL NOT DIFFER BY MORE THAN +/- 3/16 IN. FROM THE STANDARD DIMENSION.

VISUAL INSPECTION:
ALL UNITS SHALL BE SOUND AND FREE OF DEFECTS THAT WOULD INTERFERE WITH THE PROPER PLACING OF THE UNIT OR IMPAIR THE STRENGTH OR PERMANENCE OF THE CONSTRUCTION. MINOR CHIPPING INCIDENTAL TO THE USUAL METHODS OF MANUFACTURE AND FROM THE CUSTOMARY METHODS OF HANDLING IN SHIPMENT AND DELIVERY, SHALL NOT BE DEEMED GROUNDS FOR REJECTION. COLORS AND TEXTURE MAY VARY SLIGHTLY DUE TO THE NATURAL MATERIALS USED IN THE MANUFACTURE OF THE STEPTREAD.

STRUCTURAL REINFORCING:
ALL STEPTREADS ARE REINFORCED WITH A WELDED WIRE FABRIC WITH 6 BARS OF REINFORCING STEEL IN THE LINEAL DIRECTION AND REINFORCING STEEL BARS EVERY 6 INCHES IN THE TRANSVERSE DIRECTION. ALL INTERSECTIONS OF THE REINFORCING BARS TO BE WELDED. THE EMBEDDED WELD PLATES OR THREADED INSERTS WILL BE ZINC PLATED. STEPTREADS ARE DESIGNED TO MEET OR EXCEED ALL UNIFORM BUILDING CODES.

INSTALLATION:
STEPTREADS ARE TO BE WELDED OR BOLTED TO A STRUCTURAL STEEL OR WOOD STRINGER SYSTEM, DESIGNED, FABRICATED AND INSTALLED BY OTHERS, TO MEET ALL APPLICABLE BUILDING CODES FOR STAIRWAYS WITH PRECAST CONCRETE STEPTREADS.